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Berita pada kategori ‘Basisdata’

PHP on Azure and you in Vegas – Michelangelo van Dam

Feb 19, 2011

If you’re developing apps in PHP and you want a challenge that will get you some places, be sure to check out the PHP on Azure contest. Build an app with PHP, deploy it to Windows Azure and participate in a contest with a killer prize: an all-in trip to Las Vegas!

The rules are simple:

  • your app has to be written in PHP
  • preferably own development app
  • use as much as Windows Azure services
  • blog about overcoming this challenge (good/bad/ugly)

A jury will review your app and give you points on implementation, challenge and usage of Windows Azure technologies. But also on how you documented the process of deploying your app to Windows Azure.

Register before February 28, 2011. The contest itself runs from February 1, 2011 until May 15, 2011. If you register quickly, you can get attend a free Windows Azure training course given by Maarten “Mr. Azure” Balliauw on February 22, 2011.

Show the world your skills and participate. Full details of the contest can be found on http://phpazurecontest.com.

If you’re unsure how to start, I’m working on an example application to be deployed anywhere, including Windows Azure.

MySQL 5.5.9

Feb 11, 2011

You blink and there is a new version. I have not seen an Planet MySQL release as yet about this new version. Release Notes.
I’d like to say I installed it, but I downloaded the Linux – Generic 2.6 (x86, 64-bit), TAR file, only to find it contains 6 rpm files. #fail, I’m using Ubuntu.
You have to scroll to the bottom of the list (another stupid thing for a generic binary choice) to get Linux – Generic 2.6 (x86, 64-bit), Compressed TAR Archive. Double #fail

Fixing MySQL with a comment in the config file

Feb 04, 2011

A customer called with an emergency issue: A server that normally runs many MySQL instances wouldn’t start them up. Not only would it not start all of them, it wouldn’t even start the first one. The multiple instances were started through the mysql_multi init script. Perhaps you already know what was wrong!

It turns out that this server’s /etc/init.d/mysql_multi wouldn’t start unless it found the text “mysqld_multi” in the /etc/my.cnf file. Not a [mysqld_multi] config file section, but the text string “mysqld_multi”. It was using this text as a proxy for “I found a [mysqld_multi] configuration section.” This was a rather brittle test, as you can imagine.
After reading the source, I determined that the my.cnf file was fine and the configuration should not be changed, and I could not understand what had changed since it was previously working. Perhaps an automated upgrade or a similar change to the system had broken it.
The fix was to place the following comment into the file.
# This comment is only necessary to make /etc/init.d/mysql_multi work OK, it greps for mysqld_multi in an ‘if’ statement
That’s the only time I can recall fixing software by putting a comment into its configuration file. Unfortunately I don’t recall what Linux distribution this was on; I just checked a recent download, and the official MySQL distribution contains a file called mysqld_multi (note the different name) that doesn’t contain this error-prone test.

Ultimate MySQL variable and status reference list

Jan 08, 2011

I am constantly referring to the amazing MySQL manual, especially the option and variable reference table. But just as frequently, I want to look up blog posts on variables, or look for content in the Percona documentation or forums. So I present to you what is now my newest Firefox toolbar bookmark: an option and variable reference for all three sites in one!

abort_slave_event_count
blog
percona.com
manual

Aborted_clients
blog
percona.com
manual

Aborted_connects
blog
percona.com
manual

allow_suspicious_udfs
blog
percona.com
manual

ansi
blog
percona.com
manual

auto_increment_increment
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percona.com
manual

auto_increment_offset
blog
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manual

autocommit
blog
percona.com
manual

automatic_sp_privileges
blog
percona.com
manual

back_log
blog
percona.com
manual

basedir
blog
percona.com
manual

big_tables
blog
percona.com
manual

bind_address
blog
percona.com
manual

Binlog_cache_disk_use
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percona.com
manual

binlog_cache_size
blog
percona.com
manual

Binlog_cache_use
blog
percona.com
manual

binlog_direct_non_transactional_updates
blog
percona.com
manual

binlog_do_db
blog
percona.com
manual

binlog_format
blog
percona.com
manual

binlog_ignore_db
blog
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manual

binlog_row_event_max_size
blog
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manual

Binlog_stmt_cache_disk_use
blog
percona.com
manual

binlog_stmt_cache_size
blog
percona.com
manual

Binlog_stmt_cache_use
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manual

bootstrap
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manual

bulk_insert_buffer_size
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manual

Bytes_received
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manual

Bytes_sent
blog
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manual

character_set_client
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manual

character_set_client_handshake
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manual

character_set_connection
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manual

character_set_database
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manual

character_set_filesystem
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manual

character_set_results
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manual

character_set_server
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manual

character_set_system
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manual

character_sets_dir
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manual

chroot
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manual

collation_connection
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manual

collation_database
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manual

collation_server
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manual

Com_admin_commands
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manual

Com_alter_db
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manual

Com_alter_db_upgrade
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manual

Com_alter_event
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manual

Com_alter_function
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manual

Com_alter_procedure
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manual

Com_alter_server
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manual

Com_alter_table
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Com_alter_tablespace
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manual

Com_analyze
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manual

Com_assign_to_keycache
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manual

Com_backup_table
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manual

Com_begin
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manual

Com_binlog
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manual

Com_call_procedure
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manual

Com_change_db
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manual

Com_change_master
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manual

Com_check
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manual

Com_checksum
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manual

Com_commit
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manual

Com_create_db
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Com_create_event
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manual

Com_create_function
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Com_create_index
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manual

Com_create_procedure
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Com_create_server
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manual

Com_create_table
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Com_create_trigger
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manual

Com_create_udf
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manual

Com_create_user
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manual

Com_create_view
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manual

Com_dealloc_sql
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manual

Com_delete
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manual

Com_delete_multi
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manual

Com_do
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manual

Com_drop_db
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manual

Com_drop_event
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manual

Com_drop_function
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manual

Com_drop_index
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manual

Com_drop_procedure
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manual

Com_drop_server
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manual

Com_drop_table
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manual

Com_drop_trigger
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manual

Com_drop_user
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manual

Com_drop_view
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manual

Com_empty_query
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manual

Com_execute_sql
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manual

Com_flush
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manual

Com_grant
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manual

Com_ha_close
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manual

Com_ha_open
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manual

Com_ha_read
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manual

Com_help
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manual

Com_insert
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Com_insert_select
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manual

Com_install_plugin
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manual

Com_kill
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manual

Com_load
blog
percona.com
manual

Com_lock_tables
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manual

Com_optimize
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manual

Com_preload_keys
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manual

Com_prepare_sql
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Com_purge
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Com_purge_before_date
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Com_release_savepoint
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manual

Com_rename_table
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Com_rename_user
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Com_repair
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Com_replace
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Com_replace_select
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Com_reset
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Com_resignal
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Com_restore_table
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Com_revoke
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manual

Com_revoke_all
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manual

Com_rollback
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manual

Com_rollback_to_savepoint
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manual

Com_savepoint
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manual

Com_select
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manual

Com_set_option
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percona.com
manual

Com_show_authors
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manual

Com_show_binlog_events
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manual

Com_show_binlogs
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manual

Com_show_charsets
blog
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manual

Com_show_collations
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manual

Com_show_column_types
blog
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manual

Com_show_contributors
blog
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manual

Com_show_create_db
blog
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manual

Com_show_create_event
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manual

Com_show_create_func
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Com_show_create_proc
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manual

Com_show_create_table
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Com_show_create_trigger
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manual

Com_show_databases
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Com_show_engine_logs
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manual

Com_show_engine_mutex
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manual

Com_show_engine_status
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manual

Com_show_errors
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manual

Com_show_events
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manual

Com_show_fields
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Com_show_function_code
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manual

Com_show_function_status
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manual

Com_show_grants
blog
percona.com
manual

Com_show_innodb_status
blog
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manual

Com_show_keys
blog
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manual

Com_show_logs
blog
percona.com
manual

Com_show_master_status
blog
percona.com
manual

Com_show_new_master
blog
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manual

Com_show_open_tables
blog
percona.com
manual

Com_show_plugins
blog
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manual

Com_show_privileges
blog
percona.com
manual

Com_show_procedure_code
blog
percona.com
manual

Com_show_procedure_status
blog
percona.com
manual

Com_show_processlist
blog
percona.com
manual

Com_show_profile
blog
percona.com
manual

Com_show_profiles
blog
percona.com
manual

Com_show_relaylog_events
blog
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manual

Com_show_slave_hosts
blog
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manual

Com_show_slave_status
blog
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manual

Com_show_status
blog
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manual

Com_show_storage_engines
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manual

Com_show_table_status
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manual

Com_show_tables
blog
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manual

Com_show_triggers
blog
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manual

Com_show_variables
blog
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manual

Com_show_warnings
blog
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manual

Com_signal
blog
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manual

Com_slave_start
blog
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manual

Com_slave_stop
blog
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manual

Com_stmt_close
blog
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manual

Com_stmt_execute
blog
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manual

Com_stmt_fetch
blog
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manual

Com_stmt_prepare
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manual

Com_stmt_reprepare
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manual

Com_stmt_reset
blog
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manual

Com_stmt_send_long_data
blog
percona.com
manual

Com_truncate
blog
percona.com
manual

Com_uninstall_plugin
blog
percona.com
manual

Com_unlock_tables
blog
percona.com
manual

Com_update
blog
percona.com
manual

Com_update_multi
blog
percona.com
manual

Com_xa_commit
blog
percona.com
manual

Com_xa_end
blog
percona.com
manual

Com_xa_prepare
blog
percona.com
manual

Com_xa_recover
blog
percona.com
manual

Com_xa_rollback
blog
percona.com
manual

Com_xa_start
blog
percona.com
manual

completion_type
blog
percona.com
manual

Compression
blog
percona.com
manual

concurrent_insert
blog
percona.com
manual

connect_timeout
blog
percona.com
manual

Connections
blog
percona.com
manual

console
blog
percona.com
manual

core_file
blog
percona.com
manual

Created_tmp_disk_tables
blog
percona.com
manual

Created_tmp_files
blog
percona.com
manual

Created_tmp_tables
blog
percona.com
manual

datadir
blog
percona.com
manual

date_format
blog
percona.com
manual

datetime_format
blog
percona.com
manual

debug
blog
percona.com
manual

debug_sync
blog
percona.com
manual

debug_sync_timeout
blog
percona.com
manual

default_storage_engine
blog
percona.com
manual

default_time_zone
blog
percona.com
manual

default_week_format
blog
percona.com
manual

defaults_extra_file
blog
percona.com
manual

defaults_file
blog
percona.com
manual

defaults_group_suffix
blog
percona.com
manual

delay_key_write
blog
percona.com
manual

Delayed_errors
blog
percona.com
manual

delayed_insert_limit
blog
percona.com
manual

Delayed_insert_threads
blog
percona.com
manual

delayed_insert_timeout
blog
percona.com
manual

delayed_queue_size
blog
percona.com
manual

Delayed_writes
blog
percona.com
manual

des_key_file
blog
percona.com
manual

disconnect_slave_event_count
blog
percona.com
manual

div_precision_increment
blog
percona.com
manual

enable_locking
blog
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manual

enable_named_pipe
blog
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manual

enable_pstack
blog
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manual

engine_condition_pushdown
blog
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manual

error_count
blog
percona.com
manual

event_scheduler
blog
percona.com
manual

exit_info
blog
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manual

expire_logs_days
blog
percona.com
manual

external_locking
blog
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manual

external_user
blog
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manual

federated
blog
percona.com
manual

flush
blog
percona.com
manual

Flush_commands
blog
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manual

flush_time
blog
percona.com
manual

foreign_key_checks
blog
percona.com
manual

ft_boolean_syntax
blog
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manual

ft_max_word_len
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manual

ft_min_word_len
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manual

ft_query_expansion_limit
blog
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manual

ft_stopword_file
blog
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manual

gdb
blog
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manual

general_log
blog
percona.com
manual

general_log_file
blog
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manual

group_concat_max_len
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manual

Handler_commit
blog
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manual

Handler_delete
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manual

Handler_prepare
blog
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manual

Handler_read_first
blog
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Handler_read_key
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Handler_read_last
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Handler_read_next
blog
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manual

Handler_read_prev
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manual

Handler_read_rnd
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manual

Handler_read_rnd_next
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manual

Handler_rollback
blog
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manual

Handler_savepoint
blog
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manual

Handler_savepoint_rollback
blog
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manual

Handler_update
blog
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manual

Handler_write
blog
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manual

have_compress
blog
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manual

have_crypt
blog
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manual

have_csv
blog
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manual

have_dynamic_loading
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have_geometry
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have_innodb
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have_openssl
blog
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have_partitioning
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have_profiling
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have_query_cache
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have_rtree_keys
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have_ssl
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manual

have_symlink
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manual

help
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manual

hostname
blog
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manual

identity
blog
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manual

ignore_builtin_innodb
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manual

init_connect
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manual

init_file
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init_slave
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innodb
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innodb_adaptive_flushing
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innodb_adaptive_hash_index
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innodb_additional_mem_pool_size
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innodb_autoextend_increment
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innodb_autoinc_lock_mode
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manual

innodb_buffer_pool_instances
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manual

Innodb_buffer_pool_pages_data
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manual

Innodb_buffer_pool_pages_dirty
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Innodb_buffer_pool_pages_flushed
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manual

Innodb_buffer_pool_pages_free
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Innodb_buffer_pool_pages_latched
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Innodb_buffer_pool_pages_misc
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Innodb_buffer_pool_pages_total
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Innodb_buffer_pool_read_ahead
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Innodb_buffer_pool_read_ahead_evicted
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Innodb_buffer_pool_read_requests
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Innodb_buffer_pool_reads
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manual

innodb_buffer_pool_size
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Innodb_buffer_pool_wait_free
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Innodb_buffer_pool_write_requests
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innodb_change_buffering
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innodb_checksums
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innodb_commit_concurrency
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innodb_concurrency_tickets
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innodb_data_file_path
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Innodb_data_fsyncs
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innodb_data_home_dir
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manual

Innodb_data_pending_fsyncs
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Innodb_data_pending_reads
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Innodb_data_pending_writes
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Innodb_data_read
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Innodb_data_reads
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Innodb_data_writes
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Innodb_data_written
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Innodb_dblwr_pages_written
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Innodb_dblwr_writes
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innodb_doublewrite
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innodb_fast_shutdown
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innodb_file_format
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innodb_file_format_check
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innodb_file_format_max
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innodb_file_per_table
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innodb_flush_log_at_trx_commit
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innodb_flush_method
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innodb_force_recovery
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Innodb_have_atomic_builtins
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innodb_io_capacity
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innodb_lock_wait_timeout
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innodb_locks_unsafe_for_binlog
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innodb_log_buffer_size
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innodb_log_file_size
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innodb_log_files_in_group
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innodb_log_group_home_dir
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Innodb_log_waits
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Innodb_log_write_requests
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Innodb_log_writes
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innodb_max_dirty_pages_pct
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innodb_max_purge_lag
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innodb_mirrored_log_groups
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innodb_old_blocks_pct
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innodb_old_blocks_time
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innodb_open_files
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Innodb_os_log_fsyncs
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Innodb_os_log_pending_fsyncs
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Innodb_os_log_pending_writes
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Innodb_os_log_written
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Innodb_page_size
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Innodb_pages_created
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Innodb_pages_read
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Innodb_pages_written
blog
percona.com
manual

innodb_purge_batch_size
blog
percona.com
manual

innodb_purge_threads
blog
percona.com
manual

innodb_read_ahead_threshold
blog
percona.com
manual

innodb_read_io_threads
blog
percona.com
manual

innodb_replication_delay
blog
percona.com
manual

innodb_rollback_on_timeout
blog
percona.com
manual

Innodb_row_lock_current_waits
blog
percona.com
manual

Innodb_row_lock_time
blog
percona.com
manual

Innodb_row_lock_time_avg
blog
percona.com
manual

Innodb_row_lock_time_max
blog
percona.com
manual

Innodb_row_lock_waits
blog
percona.com
manual

Innodb_rows_deleted
blog
percona.com
manual

Innodb_rows_inserted
blog
percona.com
manual

Innodb_rows_read
blog
percona.com
manual

Innodb_rows_updated
blog
percona.com
manual

innodb_spin_wait_delay
blog
percona.com
manual

innodb_stats_on_metadata
blog
percona.com
manual

innodb_stats_sample_pages
blog
percona.com
manual

innodb_status_file
blog
percona.com
manual

innodb_strict_mode
blog
percona.com
manual

innodb_support_xa
blog
percona.com
manual

innodb_sync_spin_loops
blog
percona.com
manual

innodb_table_locks
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percona.com
manual

innodb_thread_concurrency
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percona.com
manual

innodb_thread_sleep_delay
blog
percona.com
manual

Innodb_truncated_status_writes
blog
percona.com
manual

innodb_use_native_aio
blog
percona.com
manual

innodb_use_sys_malloc
blog
percona.com
manual

innodb_version
blog
percona.com
manual

innodb_write_io_threads
blog
percona.com
manual

insert_id
blog
percona.com
manual

interactive_timeout
blog
percona.com
manual

join_buffer_size
blog
percona.com
manual

keep_files_on_create
blog
percona.com
manual

Key_blocks_not_flushed
blog
percona.com
manual

Key_blocks_unused
blog
percona.com
manual

Key_blocks_used
blog
percona.com
manual

key_buffer_size
blog
percona.com
manual

key_cache_age_threshold
blog
percona.com
manual

key_cache_block_size
blog
percona.com
manual

key_cache_division_limit
blog
percona.com
manual

Key_read_requests
blog
percona.com
manual

Key_reads
blog
percona.com
manual

Key_write_requests
blog
percona.com
manual

Key_writes
blog
percona.com
manual

language
blog
percona.com
manual

large_files_support
blog
percona.com
manual

large_page_size
blog
percona.com
manual

large_pages
blog
percona.com
manual

last_insert_id
blog
percona.com
manual

Last_query_cost
blog
percona.com
manual

lc_messages
blog
percona.com
manual

lc_messages_dir
blog
percona.com
manual

lc_time_names
blog
percona.com
manual

license
blog
percona.com
manual

local_infile
blog
percona.com
manual

local_infile
blog
percona.com
manual

lock_wait_timeout
blog
percona.com
manual

locked_in_memory
blog
percona.com
manual

log
blog
percona.com
manual

log_bin
blog
percona.com
manual

log_bin
blog
percona.com
manual

log_bin_index
blog
percona.com
manual

log_bin_trust_function_creators
blog
percona.com
manual

log_error
blog
percona.com
manual

log_isam
blog
percona.com
manual

log_output
blog
percona.com
manual

log_queries_not_using_indexes
blog
percona.com
manual

log_short_format
blog
percona.com
manual

log_slave_updates
blog
percona.com
manual

log_slow_admin_statements
blog
percona.com
manual

log_slow_queries
blog
percona.com
manual

log_slow_slave_statements
blog
percona.com
manual

log_tc
blog
percona.com
manual

log_tc_size
blog
percona.com
manual

log_warnings
blog
percona.com
manual

long_query_time
blog
percona.com
manual

low_priority_updates
blog
percona.com
manual

lower_case_file_system
blog
percona.com
manual

lower_case_table_names
blog
percona.com
manual

master_bind
blog
percona.com
manual

master_connect_retry
blog
percona.com
manual

master_host
blog
percona.com
manual

master_info_file
blog
percona.com
manual

master_password
blog
percona.com
manual

master_port
blog
percona.com
manual

master_retry_count
blog
percona.com
manual

master_ssl
blog
percona.com
manual

master_ssl_ca
blog
percona.com
manual

master_ssl_capath
blog
percona.com
manual

master_ssl_cert
blog
percona.com
manual

master_ssl_cipher
blog
percona.com
manual

master_ssl_key
blog
percona.com
manual

master_user
blog
percona.com
manual

max_allowed_packet
blog
percona.com
manual

max_binlog_cache_size
blog
percona.com
manual

max_binlog_dump_events
blog
percona.com
manual

max_binlog_size
blog
percona.com
manual

max_binlog_stmt_cache_size
blog
percona.com
manual

max_connect_errors
blog
percona.com
manual

max_connections
blog
percona.com
manual

max_delayed_threads
blog
percona.com
manual

max_error_count
blog
percona.com
manual

max_heap_table_size
blog
percona.com
manual

max_insert_delayed_threads
blog
percona.com
manual

max_join_size
blog
percona.com
manual

max_length_for_sort_data
blog
percona.com
manual

max_prepared_stmt_count
blog
percona.com
manual

max_relay_log_size
blog
percona.com
manual

max_seeks_for_key
blog
percona.com
manual

max_sort_length
blog
percona.com
manual

max_sp_recursion_depth
blog
percona.com
manual

max_tmp_tables
blog
percona.com
manual

Max_used_connections
blog
percona.com
manual

max_user_connections
blog
percona.com
manual

max_write_lock_count
blog
percona.com
manual

memlock
blog
percona.com
manual

min_examined_row_limit
blog
percona.com
manual

myisam_block_size
blog
percona.com
manual

myisam_data_pointer_size
blog
percona.com
manual

myisam_max_sort_file_size
blog
percona.com
manual

myisam_mmap_size
blog
percona.com
manual

myisam_recover
blog
percona.com
manual

myisam_recover_options
blog
percona.com
manual

myisam_recover_options
blog
percona.com
manual

myisam_repair_threads
blog
percona.com
manual

myisam_sort_buffer_size
blog
percona.com
manual

myisam_stats_method
blog
percona.com
manual

myisam_use_mmap
blog
percona.com
manual

named_pipe
blog
percona.com
manual

net_buffer_length
blog
percona.com
manual

net_read_timeout
blog
percona.com
manual

net_retry_count
blog
percona.com
manual

net_write_timeout
blog
percona.com
manual

new
blog
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manual

no_defaults
blog
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manual

Not_flushed_delayed_rows
blog
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manual

old
blog
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manual

old_alter_table
blog
percona.com
manual

old_passwords
blog
percona.com
manual

old_style_user_limits
blog
percona.com
manual

one_thread
blog
percona.com
manual

Open_files
blog
percona.com
manual

open_files_limit
blog
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manual

Open_streams
blog
percona.com
manual

Open_table_definitions
blog
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manual

Open_tables
blog
percona.com
manual

Opened_files
blog
percona.com
manual

Opened_table_definitions
blog
percona.com
manual

Opened_tables
blog
percona.com
manual

optimizer_prune_level
blog
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manual

optimizer_search_depth
blog
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manual

optimizer_switch
blog
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manual

partition
blog
percona.com
manual

performance_schema
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manual

Performance_schema_cond_classes_lost
blog
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manual

Performance_schema_cond_instances_lost
blog
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manual

performance_schema_events_waits_history_long_size
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manual

performance_schema_events_waits_history_size
blog
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manual

Performance_schema_file_classes_lost
blog
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manual

Performance_schema_file_handles_lost
blog
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manual

Performance_schema_file_instances_lost
blog
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manual

Performance_schema_locker_lost
blog
percona.com
manual

performance_schema_max_cond_classes
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manual

performance_schema_max_cond_instances
blog
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manual

performance_schema_max_file_classes
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manual

performance_schema_max_file_handles
blog
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manual

performance_schema_max_file_instances
blog
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manual

performance_schema_max_mutex_classes
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manual

performance_schema_max_mutex_instances
blog
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manual

performance_schema_max_rwlock_classes
blog
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manual

performance_schema_max_rwlock_instances
blog
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manual

performance_schema_max_table_handles
blog
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manual

performance_schema_max_table_instances
blog
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manual

performance_schema_max_thread_classes
blog
percona.com
manual

performance_schema_max_thread_instances
blog
percona.com
manual

Performance_schema_mutex_classes_lost
blog
percona.com
manual

Performance_schema_mutex_instances_lost
blog
percona.com
manual

Performance_schema_rwlock_classes_lost
blog
percona.com
manual

Performance_schema_rwlock_instances_lost
blog
percona.com
manual

Performance_schema_table_handles_lost
blog
percona.com
manual

Performance_schema_table_instances_lost
blog
percona.com
manual

Performance_schema_thread_classes_lost
blog
percona.com
manual

Performance_schema_thread_instances_lost
blog
percona.com
manual

pid_file
blog
percona.com
manual

plugin
blog
percona.com
manual

plugin_dir
blog
percona.com
manual

plugin_load
blog
percona.com
manual

port
blog
percona.com
manual

port_open_timeout
blog
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manual

preload_buffer_size
blog
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manual

Prepared_stmt_count
blog
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manual

print_defaults
blog
percona.com
manual

profiling
blog
percona.com
manual

profiling_history_size
blog
percona.com
manual

protocol_version
blog
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manual

proxy_user
blog
percona.com
manual

pseudo_thread_id
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percona.com
manual

Qcache_free_blocks
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manual

Qcache_free_memory
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manual

Qcache_hits
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percona.com
manual

Qcache_inserts
blog
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manual

Qcache_lowmem_prunes
blog
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manual

Qcache_not_cached
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manual

Qcache_queries_in_cache
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percona.com
manual

Qcache_total_blocks
blog
percona.com
manual

Queries
blog
percona.com
manual

query_alloc_block_size
blog
percona.com
manual

query_cache_limit
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manual

query_cache_min_res_unit
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manual

query_cache_size
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manual

query_cache_type
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manual

query_cache_wlock_invalidate
blog
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manual

query_prealloc_size
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percona.com
manual

Questions
blog
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manual

rand_seed1
blog
percona.com
manual

rand_seed2
blog
percona.com
manual

range_alloc_block_size
blog
percona.com
manual

read_buffer_size
blog
percona.com
manual

read_only
blog
percona.com
manual

read_rnd_buffer_size
blog
percona.com
manual

relay_log
blog
percona.com
manual

relay_log_index
blog
percona.com
manual

relay_log_info_file
blog
percona.com
manual

relay_log_purge
blog
percona.com
manual

relay_log_recovery
blog
percona.com
manual

relay_log_space_limit
blog
percona.com
manual

replicate_do_db
blog
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manual

replicate_do_table
blog
percona.com
manual

replicate_ignore_db
blog
percona.com
manual

replicate_ignore_table
blog
percona.com
manual

replicate_rewrite_db
blog
percona.com
manual

replicate_same_server_id
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manual

replicate_wild_do_table
blog
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manual

replicate_wild_ignore_table
blog
percona.com
manual

report_host
blog
percona.com
manual

report_password
blog
percona.com
manual

report_port
blog
percona.com
manual

report_user
blog
percona.com
manual

rpl_recovery_rank
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manual

Rpl_semi_sync_master_clients
blog
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manual

rpl_semi_sync_master_enabled
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manual

Rpl_semi_sync_master_net_avg_wait_time
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manual

Rpl_semi_sync_master_net_wait_time
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manual

Rpl_semi_sync_master_net_waits
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manual

Rpl_semi_sync_master_no_times
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manual

Rpl_semi_sync_master_no_tx
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manual

Rpl_semi_sync_master_status
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manual

Rpl_semi_sync_master_timefunc_failures
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manual

rpl_semi_sync_master_timeout
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manual

rpl_semi_sync_master_trace_level
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manual

Rpl_semi_sync_master_tx_avg_wait_time
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manual

Rpl_semi_sync_master_tx_wait_time
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manual

Rpl_semi_sync_master_tx_waits
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manual

rpl_semi_sync_master_wait_no_slave
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manual

Rpl_semi_sync_master_wait_pos_backtraverse
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manual

Rpl_semi_sync_master_wait_sessions
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manual

Rpl_semi_sync_master_yes_tx
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manual

rpl_semi_sync_slave_enabled
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manual

Rpl_semi_sync_slave_status
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rpl_semi_sync_slave_trace_level
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manual

Rpl_status
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manual

safe_mode
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manual

safe_show_database
blog
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manual

safe_user_create
blog
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manual

secure_auth
blog
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manual

secure_file_priv
blog
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manual

Select_full_join
blog
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manual

Select_full_range_join
blog
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manual

Select_range
blog
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manual

Select_range_check
blog
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manual

Select_scan
blog
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manual

server_id
blog
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manual

shared_memory
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manual

shared_memory_base_name
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manual

show_slave_auth_info
blog
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manual

skip_character_set_client_handshake
blog
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manual

skip_concurrent_insert
blog
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manual

skip_event_scheduler
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manual

skip_external_locking
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manual

skip_grant_tables
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manual

skip_host_cache
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manual

skip_locking
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manual

skip_log_warnings
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manual

skip_name_resolve
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manual

skip_networking
blog
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manual

skip_partition
blog
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manual

skip_safemalloc
blog
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manual

skip_show_database
blog
percona.com
manual

skip_slave_start
blog
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manual

skip_ssl
blog
percona.com
manual

skip_stack_trace
blog
percona.com
manual

skip_symbolic_links
blog
percona.com
manual

skip_thread_priority
blog
percona.com
manual

slave_compressed_protocol
blog
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manual

slave_exec_mode
blog
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manual

Slave_heartbeat_period
blog
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manual

slave_load_tmpdir
blog
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manual

slave_net_timeout
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manual

Slave_open_temp_tables
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manual

Slave_received_heartbeats
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manual

Slave_retried_transactions
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manual

Slave_running
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manual

slave_skip_errors
blog
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manual

slave_transaction_retries
blog
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manual

slave_type_conversions
blog
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manual

Slow_launch_threads
blog
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manual

slow_launch_time
blog
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manual

Slow_queries
blog
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manual

slow_query_log
blog
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manual

slow_query_log_file
blog
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manual

socket
blog
percona.com
manual

sort_buffer_size
blog
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manual

Sort_merge_passes
blog
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manual

Sort_range
blog
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manual

Sort_rows
blog
percona.com
manual

Sort_scan
blog
percona.com
manual

sporadic_binlog_dump_fail
blog
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manual

sql_auto_is_null
blog
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manual

sql_big_selects
blog
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manual

sql_big_tables
blog
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manual

sql_buffer_result
blog
percona.com
manual

sql_log_bin
blog
percona.com
manual

sql_log_off
blog
percona.com
manual

sql_log_update
blog
percona.com
manual

sql_low_priority_updates
blog
percona.com
manual

sql_max_join_size
blog
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manual

sql_mode
blog
percona.com
manual

sql_notes
blog
percona.com
manual

sql_quote_show_create
blog
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manual

sql_safe_updates
blog
percona.com
manual

sql_select_limit
blog
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manual

sql_slave_skip_counter
blog
percona.com
manual

sql_warnings
blog
percona.com
manual

ssl
blog
percona.com
manual

Ssl_accept_renegotiates
blog
percona.com
manual

Ssl_accepts
blog
percona.com
manual

ssl_ca
blog
percona.com
manual

Ssl_callback_cache_hits
blog
percona.com
manual

ssl_capath
blog
percona.com
manual

ssl_cert
blog
percona.com
manual

ssl_cipher
blog
percona.com
manual

Ssl_cipher
blog
percona.com
manual

Ssl_cipher_list
blog
percona.com
manual

Ssl_client_connects
blog
percona.com
manual

Ssl_connect_renegotiates
blog
percona.com
manual

Ssl_ctx_verify_depth
blog
percona.com
manual

Ssl_ctx_verify_mode
blog
percona.com
manual

Ssl_default_timeout
blog
percona.com
manual

Ssl_finished_accepts
blog
percona.com
manual

Ssl_finished_connects
blog
percona.com
manual

ssl_key
blog
percona.com
manual

Ssl_session_cache_hits
blog
percona.com
manual

Ssl_session_cache_misses
blog
percona.com
manual

Ssl_session_cache_mode
blog
percona.com
manual

Ssl_session_cache_overflows
blog
percona.com
manual

Ssl_session_cache_size
blog
percona.com
manual

Ssl_session_cache_timeouts
blog
percona.com
manual

Ssl_sessions_reused
blog
percona.com
manual

Ssl_used_session_cache_entries
blog
percona.com
manual

Ssl_verify_depth
blog
percona.com
manual

Ssl_verify_mode
blog
percona.com
manual

ssl_verify_server_cert
blog
percona.com
manual

Ssl_version
blog
percona.com
manual

standalone
blog
percona.com
manual

storage_engine
blog
percona.com
manual

symbolic_links
blog
percona.com
manual

sync_binlog
blog
percona.com
manual

sync_frm
blog
percona.com
manual

sync_master_info
blog
percona.com
manual

sync_relay_log
blog
percona.com
manual

sync_relay_log_info
blog
percona.com
manual

sysdate_is_now
blog
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manual

system_time_zone
blog
percona.com
manual

table_definition_cache
blog
percona.com
manual

table_lock_wait_timeout
blog
percona.com
manual

Table_locks_immediate
blog
percona.com
manual

Table_locks_waited
blog
percona.com
manual

table_open_cache
blog
percona.com
manual

table_type
blog
percona.com
manual

tc_heuristic_recover
blog
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manual

Tc_log_max_pages_used
blog
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Tc_log_page_size
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Tc_log_page_waits
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temp_pool
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thread_cache_size
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thread_concurrency
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thread_handling
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thread_stack
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Threads_cached
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Threads_connected
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Threads_created
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Threads_running
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time_format
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time_zone
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timed_mutexes
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timestamp
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tmp_table_size
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tmpdir
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transaction_alloc_block_size
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transaction_isolation
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transaction_prealloc_size
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tx_isolation
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unique_checks
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updatable_views_with_limit
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Uptime
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Uptime_since_flush_status
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user
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verbose
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version
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version_comment
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version_compile_machine
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version_compile_os
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wait_timeout
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warning_count
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Terabytes is not big data, petabytes is

Jan 07, 2011

I often wonder what’s behind the increased trend behind Hadoop and other NoSQL technologies. I realize if you’re Yahoo that such technology makes sense. I don’t get why everyone else wants to use it.
Reading Stephen O’Grady’s self-review of his predictions for 2010 for the first time gave me some insights into how such people think:

Democratization of Big Data
Consider that RedMonk, a four person analyst shop, has the technical wherewithal to attack datasets ranging from gigabytes to terabytes in size. Unless you?re making institutional money, budgets historically have not permitted this. The tools of Big Data have never been more accessible than they are today.
read more

Year 7DB!

Jan 03, 2011

OK, yes, I was kinda sad enough at the end of December to convert 2011 to hex to find it is 7DB.? Which I think is appropriate as for me at least this will be the year of Drizzle7 DBMS.
It may be the winter holiday season but many of us Drizzle developers haven’t taken much of a break.? I have been working hard to keep our bug count down and will be working on some really cool new features this month.? Brian Aker has also announced things that he has been working on in this mailing list post.
So, what can you expect from the Drizzle project in year 7DB?? Here is a sneak preview of a few things off the top of my head (I really hope I haven’t missed anyone here):

Completion of replication support (thanks to David Shrewsbury, Joe Daly and everyone else involved there)
Many bugs killed (thanks as always to Patrick Crews for making our jobs that much harder by finding the bugs ? We have also have a bug killing week later this month.
Support for a few more data types (and probably improved support for current types)
Catalogs support
Improvements to system variables and options (thanks to Monty Taylor and Vijay Samuel)
InnoDB 1.1.4 (in fact, it has already been merged in, thanks to Stewart Smith)
Some really rocking documentation taking shape (thanks to our new documentation writer Marisa Plumb)
Some O’Reilly MySQL Conference and Expo talks (I will be there, details in another blog post soon)
Drizzle 7 GA release

And much of this will be done very early on this year. Development is happening at a very rapid pace and have made some great achievements so far.? As always we love to for you to try the source or our binaries and love to hear feedback.? We have had some fantastic feedback so far which has led to very rapid fixes and improvements in various areas.

MySQL NUMA allocations under 2.6.32+

Dec 30, 2010

refering Jeremy Cole’s post on swapstorming under NUMA hardware, I’ll note something potentially new.While I’ve seen this “brick wall swapstorming” a few times before and since the post, I just saw some new OS installs not do this by default, and using the numactl to change the defaults is actually harmful to system interactivity.In the brick-wall cases, two NUMA zones of ~30G each, plus a mysqld (or memcached) running with 45G of ram, would equal 30G in memory, and 15G in swap. Ugly.In this case, I’m getting a little bit in swap, but a relatively even note dist.Here’s a box with no numactl tuning:
N0 : 7068733 ( 26.97 GB)
N1 : 7120258 ( 27.16 GB)
active : 13355529 ( 50.95 GB)
anon : 14187441 ( 54.12 GB)
dirty : 14185099 ( 54.11 GB)
mapmax : 265 ( 0.00 GB)
mapped : 1580 ( 0.01 GB)
swapcache : 2350 ( 0.01 GB)
similar hardware, same OS/kernel running under numactl –interleave=all:
N0 : 6778742 ( 25.86 GB)
N1 : 6313382 ( 24.08 GB)
active : 12395957 ( 47.29 GB)
anon : 13090566 ( 49.94 GB)
dirty : 13090566 ( 49.94 GB)
mapmax : 255 ( 0.00 GB)
mapped : 1588 ( 0.01 GB)
… just a touch in swap on the first guy. Though I’m going to wait a few days to declare victory or defeat, since I did see the first guy dump nearly a whole gig of swap once, but wasn’t able to confirm if the swapped memory was mysql yet.The side note here is that my numactl-modified node is exhibiting some extreme latency on interactivity. Appears to be related to anything that needs to fork having a half-second delay. MySQL seems to be running fine though.I haven’t investigated at all as to how numa distribution has changed in recent kernels (though I know it’s been steadily improving over the years). Unfortunately every other box I’ve used which *has* the problem, runs on a redhat/centos5 kernel. Which is ancient to an extreme.In this case it’s debian squeeze with its default 2.6.32 kernel. Anyone try a recent ubuntu or redhat6 yet and see if the NUMA/swap issues are better on there?

Proposal for MariaDB trademark policy

Dec 21, 2010

Within Monty Program Ab we have during this year had a lot of discussions about how to go forward with the MariaDB trademark. It’s been clear that everyone wants to have something that is substantially freer than the MySQL trademark to ensure the survival of MariaDB whatever happens to Monty Program Ab.We wanted to make something that should work well, both for open source and commercial usage (and yes, I know that in some cases these are one and the same), which is not very common with many other trademark policies. My belief is that by having a very liberal trademark policy we will create a bigger ecosystem around MariaDB which will help all of us.Now we have had a couple of internal drafts (with heavy input from our community advocates) and we have released our first public draft.Please give us feedback about this either on my blog or the knowledge base so that we can take your thoughts into account for our final version!

Tuning InnoDB Configuration

Dec 21, 2010

I had earlier written a post on tuning the MySQL server configuration which was more geared towards the MyISAM storage engine. While that is not because I didn’t intend on ignoring InnoDB but because I had planned a whole post on tuning InnoDB related configuration. So this post is the post that I had planned, I have discussed the major configuration parameters in here that should help you out most of the times.

MySQL Workbench: Manage MySQL on Windows Servers the Windows way

Dec 13, 2010

The MySQL team has been continuously improving its products on the Windows platform.?Along this line, we’ve responded to a request from our users of Workbench on Windows – to provide remote access to Windows Servers using Windows management methods – as an alternative? to SSH.
Managing a MySQL server obviously requires access to the target machine, which usually requires elevated rights for certain tasks like restarting the server or manipulating the configuration file on Windows (where this file is in a protected path). For local connections this is mostly not a big deal. However for remote boxes security measures prevent easy manipulation of such essential things like server processes. In this blog post we discuss native Windows management and how it can be used in MySQL Workbench.

Remote Management
MySQL Workbench first introduced remote access via SSH (secure shell), a widely used and well known approach for secure remote access, especially in the Linux world. Microsoft Windows does not come with an in-built SSH server, hence an additional installation is due. For Windows users is SSH quite an unkown land and very often security rules, policies, company restrictions etc. do not allow to add extra software or open access via SSH. Also setting up SSH is non trivial and can be quite a challenge forless technical users. For these reason we have added support for native Windows management, which comes at no extra cost, since it is built into Windows already.
Native Windows Management
The management we will discuss here is not about how to add users or databases to a MySQL server and things like that.? It’s rather about? administering the MySQL server Instance that we’ll discuss here – for instance, DBA tasks such as manipulating the MySQL configuration file or controlling the server processes. Windows comes with a universal management layer called WMI (Windows Management Instrumentation). WMI is a very powerful means to query all kind of data from a Windows system (drivers, BIOS, motherboard, performance data etc.) and to manipulate the state of certain components (services, subsystems etc.). If you are going to manage a MySQL installation on a Windows server from a Windows machine (Workbench supports Windows 7) then WMI is the way to go. Due to security restrictions (e.g. UAC) WMI access works best in a domain setup as it already has all the necessary pieces to make the interplay work seamlessly. At the end of the article I have included additional information to help when setting up native Windows management for non-domain environments. However beware as that involves? disabling some important UACs, which is not advisable in most instances.
In a Windows domain you will need is a user login that has local administrator rights on the target machine MySQL server runs on. By default firewalls and access rules are typicallu set so that Workbench can connect without extra effort. WMI is used to query a server’s status and start or stop it as well as to get system information like CPU load and memory usage. Manipulating the MySQL configuration file is done by using Window’s normal file system functions, which means the target box must provide access to the file via a shared folder. By default Windows systems have a number of default shares that are always available (so-called administrative shares that give access to the entire hard disk, provided you know the administrator’s credentials for login). On the client side you can then use different possibilities to access the server by using:

A mapped drive, e.g. Z:\<path to file>\my.ini
An administrative share, e.g. \\<server>\C$\<path to file>\my.ini
An explicit share which gives access only to the file or its parent folder, e.g. \\<server>\<share>\my.ini.

This should be an old hat for most Windows users, though I wanted to point out the possibilities.
Setting up a Server Instance
Let’s get to the actual setup of a new server instance in MySQL Workbench. What you need is:

The target server’s name or IP address.
Name and password of a user which is a local administrator -? a member of the administors group -? on the target machine.
The name of the MySQL service to manage.
The path of the configuration file.

Workbench will try to help you with the last two points by giving you a list of MySQL servers it finds on the remote computer and their configuration file location. So it should mostly be point-and-click once you are logged in there.
Connect to the Target Machine
Open the New Server Instance Wizard from Workbench’s home screen. It comes up with the initial screen that allows you to specify the host machine of the MySQL server you want to manage thereby determining if it is a local or a remote connection. For the sake of simplicity let’s reuse a MySQL connection that has been created already in the SQL Development section. A server instance always needs such a connection. So either you reuse an already defined one or create a new one that is then added to the list of connections.

In this example I have used a Windows 2008 R2 server, which hosts the MySQL server. After selecting the connection proceed to the next page by clicking on the “Next” button. The wizard will do some initial tests and display the outcome. For a few more details (especially if something goes wrong) I recommend to open the log window using the “Show Logs” button on the wizard form.

After proceeding to the next page you will be asked to select which type of remote management you want to use. Here is where you will see the Windows Remote option.

Since we want native Windows management the option the choice is obvious. Proceeding to the next page causes the wizard to open a WMI connection to the target machine and retrieve a list of installed MySQL servers (whether running or not). Note that only the MySQL servers installed as Windows Service are recognized. In order to connect we need the credentials for a user on the target machine. As mentioned earlier, this user must be a local administrator.

Don’t get confused by the term “Service” in the login dialog. This is not the Windows service but a key that describes the given credentials. Together with the user name it defines a tupel to allow storage and retrieval of the password. Once the connection is established you can choose the server you want to manage. Selecting a server entry will automatically fill the configuration file path with a default value constructed from the server name, the administrative share C$ and the path of the file found in the service entry. Usually this is a good guess and should work most of the time.

Sometimes though things are a bit different and you can get an error when you switch to the next page.
In that case just go back to the previous page and open the file selector by clicking on the “…” button. A File Open Dialog will pop up that allows to select the file you need. This also works for remote machines, just type the machine name in the input box or use the network branch for selection. Sometimes directly accessing a share might pose problems so you may alternatively want to map a network drive in Explorer before you go on with the selection of the configuration file. For our demo the letter Z has been mapped to \\workbench.testing\C$.

After you have picked the correct file, continue to the next page which will again check if the file is accessible from MySQL Workbench. Note: only the last of the 3 tests will be performed as we already have a connection and hence don’t need to test that again. And as we are on Windows no test for any system command is required. They must be available anyway (otherwise the installation is probably broken).

Continuing, the wizard will bring up a small window asking you for a decision regarding if you just want to proceed or review what settings have been collected so far. Usually you can go on and finish the wizard after you gave your new server instance profile a proper name.

If you however want to review the details, e.g. because there is still an error at this point then click on the button “I’d like to review the settings again”. This will bring up a page that would otherwise just be skipped, which lists the collected details and allows you to opt to change them manually. This is btw. the only way to adjust the section in the configuration file that is managed by MySQL Workbench in this wizard. However, the Server Instance Manager allows to set this value as well. The default is “mysqld”.

If you checked the option “Change Parameters” you will get to a page that allows you to select the configuration file, and also let’s you test again if the file is accessible and if the given section exists in it.

Once you are satisfied with the result click “Next” to continue with the last wizard page, where you can specify a name for the new instance and finish the wizard.

Note: In the case something goes wrong you will see that the wizard does not force you to provide 100% correct details most of the time. In fact you can still continue and create the server instance even if currently no connection is possible or you do not have all relevant details. Of course without correct user credentials the wizard is not able to give you a list of installed services, so this is the minimum information, which must be correct.
What about Windows Workgroups?
In smaller and/or home networks there is typically no domain controller active, so the relationship between Windows boxes is a bit different and it is sometimes much more complicated to adjust all the necessary settings to allow this kind of access from one machine to another. Note: non-domain environments are not supported by MySQL Workbench due to various problems there.
However there are a number of web pages that discuss the use of WMI in such scenarios, which might help you to get it to work. A good overview what needs to be set can be found on the “Connecting to WMI Remotely Starting with Windows Vista” page. Most of the time you will find that these settings are already in place (except for the firewall exception), though you still get either of the most common errors:

“RPC Server not available”, which indicates the target WMI service cannot be reached at all, usually because of firewalls or wrong server name.
“Access denied” which is? the result of access-token-filtering even if an administrator is logged in.

Denied-access errors are usually caused by the UAC. Read here what Microsoft has to say about “User Account Control and WMI”. Also consider the following tips:

Add user with Administrator rights or set the proper rights for another user in “Computer Management/Services and Applications/WMI-Control -> context menu-> Security”
Firewall (“netsh firewall set service RemoteAdmin enable”)
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Lsa\ForceGuest must be 0.
A user connecting from a remote computer must have the SC_MANAGER_CONNECT privilege enabled to be able to enumerate services (admins usually have).

User Account Control is the major blocking stone in a workgroup environment. You will find connections to an old Windows XP box much simpler as there is no such thing as UAC there. Even for local management (i.e. MySQL Servers on the box where MySQL Workbench runs on) is affected by UAC. Running the application as administrator solves this (or disabling UAC). However since both methods are not recommended we have changed Workbench for this special case so it uses the old “sc” command to start and stop a service, in order to minimize trouble and effort for the most common case. WMI is still used for monitoring, just not for service control.