… it is not MySQL problem, might be even not problem with your MySQL configuration, queries and …Do push concurrency too high Many developers will test script with multiple level of concurrency and find …. It also often helps with monopolizing replication thread. For example if I need to delete …
Post: InnoDB's gap locks
March 27, 2012 By 15 Comments
… of InnoDB is the row level locking. This feature provides better concurrency … undo log entries 1 MySQL thread id 3, OS thread handle 0x7f84a78ba700, query id … second one is a global variable that affects all sessions and …dev.mysql.com/doc/refman/5.1/en/innodb-locks-set.html. Conclusion MySQL uses …
Post: InnoDB thread concurrency
June 5, 2006 By 4 Comments
…threads) thread thrashing could be still observed even with limited innodb_thread_concurrency. This is why innodb_commit_concurrency variable was added in MySQL 5.0 innodb_commit_concurrency…
Post: Mess with innodb_thread_concurrency
May 12, 2006 By 1 Comment
…MySQL 5.0.19 the meaning of innodb_thread_concurrency variable was changed (yeah, again). Now innodb_thread_concurrency=0 means unlimitied count of concurrent threads inside InnoDB…
Post: Ultimate MySQL variable and status reference list
January 8, 2011 By 4 Comments
…innodb_strict_modeblogpercona.commanual innodb_support_xablogpercona.commanual innodb_sync_spin_loopsblogpercona.commanual innodb_table_locksblogpercona.commanual innodb_thread_concurrencyblogpercona.commanual innodb_thread_sleep_delayblogpercona.commanual Innodb…
Post: Tuning InnoDB Concurrency Tickets
May 24, 2010 By 4 Comments
…that this variable only comes in to play when innodb_thread_concurrency is greater than zero. On a stock install of MySQL, …InnoDB is limited by innodb_thread_concurrency (which is why these two variables are most often tuned in concert). To continue the example, if innodb_thread_concurrency is set…
Post: SHOW INNODB STATUS walk through
July 17, 2006 By 40 Comments
…Thread declared inside InnoDB 400″ means thread is running inside Innodb kernel and still has 400 tickets to use. Innodb tries to limit thread concurrency allowing only innodb_thread_concurrency threads…
Post: Innodb usability and ease of use.
September 28, 2007 By 14 Comments
… done similar way ? Other the years variables like innodb_thread_concurrency were added with rather complicated history of …’t mix what do you currently have set in your my.cnf file – For example using…0,1,2 will be more explanatory. Furthermore MySQL even has infrastructure to support both string …
Post: Side load may massively impact your MySQL Performance
November 13, 2011 By 7 Comments
…concurrently. It is very typical to hear complains about MySQL…mysql –num-threads=1 –max-requests=0 –oltp-dist-type=uniform –max-time=180 –oltp-read-only –mysql-host=localhost –mysql-table-engine=innodb –mysql… There is a variable innodb_old_blocks_… so setting innodb_old_blocks_time variable …
Comment: What to tune in MySQL Server after installation
December 15, 2009 By 116 Comments
… innodb_data_home_dir = /var/lib/mysql/ #innodb_data_file_path = ibdata1:100M:autoextend set-variable = innodb_buffer_pool_size=100M set-variable = innodb_additional_mem_pool_size=10M innodb…=1 #skip-innodb skip-name-resolve # Try number of CPU’s*2 for thread_concurrency thread_concurrency = 16 set-variable=max_connections=2000 [mysql.server] user=mysql basedir=/var…
