One of the most important features of InnoDB is the row level locking. This feature provides better concurrency under heavy write load… phantom reads and to get a consistent Statement based replication. To accomplish that, row level locking databases also acquire gap locks. What is… INNODB STATUS: —TRANSACTION 72C, ACTIVE 755 sec 4 lock struct(s), heap size 1248, 3 row lock(s), undo log entries 1 MySQL…
Post: Ultimate MySQL variable and status reference list
January 8, 2011 By 4 Comments
…MySQL manual, especially the option …replication_delayblogpercona.commanual innodb_rollback_on_timeoutblogpercona.commanual Innodb_row_lock_current_waitsblogpercona.commanual Innodb_row_lock_timeblogpercona.commanual Innodb_row….commanual Innodb_truncated_status_writesblogpercona.commanual innodb_…
Post: Estimating Replication Capacity
July 20, 2010 By 4 Comments
…mysql> select * from information_schema.user_statistics where user=”#mysql_system#” \G *************************** 1. row *************************** USER: #mysql…replication the most. It however works only with statement level replication…
Comment: 7 Reasons why MySQL Quality will never be the same
December 12, 2008 By 15 Comments
… be mentioned by “weakest link” – if Partitions or Row Level Replication is unstable in MySQL 5.1 GA it is unstable. At the same… it works well or it does not. I see GA status not as seal of quality but rather as a promise…
Post: Shard-Query EC2 images available
May 11, 2011 By 2 Comments
…mysql> show table status like ‘ontime_fact’G *************************** 1. row *************************** Name: ontime_fact Engine: InnoDB Version: 10 Row_format: Compact Rows: 6697533 Avg_row…-relay-log innodb-replication-delay=# innodb-rollback-…good plan optimizer-prune-level=0 partition=ON …
Post: MySQL Server Variables - SQL layer or Storage Engine specific.
June 8, 2006 By 14 Comments
… memory tables. So first MySQL versions did not bother … tables have “holes” (deleted rows) which can help significantly….expire_logs_days This is replication/binlogging related options – when …MyISAM and Innodb. Some SQL level items as Query Cache …by mutexes in SHOW MUTEX STATUS. Was intended to work …
Post: Heikki Tuuri answers to Innodb questions, Part II
November 4, 2007 By 13 Comments
….0 series compact row format was implemented which…Q36: There have been several MySQL bugs opened about multi-core… operations for different levels of concurrency, specifically around…separate computer, maybe a replication slave. Can you … where id=5 show innodb status: Hash table size 10624987,…
Post: Heikki Tuuri Innodb answers - Part I
October 26, 2007 By 17 Comments
…level READ COMMITTED, then InnoDB normally does not lock the ‘gaps’, and it does not lock rows…replication, and remember that the execution is not serializable. PZ: Cool. This is one of little known new features in MySQL…threads waiting for semaphores in SHOW INNODB STATUS), you can try to disable …
Comment: Percona Replication Manager, a solution for MySQL high availability with replication using Pacemaker
February 8, 2012 By 94 Comments
…mysql -u repl -p7la4epa99 -e’show slave statusG’ returns an empty set and the master status differs: *************************** 1. row *************************** File: mysql…” role=”Master” OCF_CHECK_LEVEL=”1″ \n op monitor …” property $id=”mysql_replication” \n replication_info=”10.20.0.21|mysql…
