… | NULL | Query | 317 | Waiting for table flush | flush tables with read lock | 0 | 0 | 1 | | 10291 | root | localhost | dumptest | Query | 0 | NULL | show processlist | 0 | 0 … using Innodb tables and you’re not actively changing users, stored procedures etc (which are stored in MyISAM tables anyway…
Post: Table locks in SHOW INNODB STATUS
June 8, 2010 By 1 Comment
… root TABLE LOCK table `test/t1` trx id 0 4872 lock mode IX This output gives us an impression Innodb has taken table lock on test/t1 table and many people tend to think Innodb… table – for example to drop the table you need to lock it exclusively. So do not worry intention table locks you may observe in SHOW INNODB…
Post: Copying InnoDB tables between servers
July 31, 2009 By 11 Comments
…/06/08/impossible-possible-moving-innodb-tables-between-servers/ is now available in our latest releases of XtraBackup 0.8.1 and XtraDB…, no needs to lock or shutdown server. To export table you need XtraBackup, and you can just specify table or table by mask: xtrabackup… innodb_expand_import=1; to put XtraDB into extended import mode, and now we need to create empty table with the same table…
Post: Thinking about running OPTIMIZE on your Innodb Table ? Stop!
December 9, 2010 By 18 Comments
…LOCK TABLES on Innodb table to ensure there is not ton of queries starting reading table…
Post: SHOW INNODB STATUS walk through
July 17, 2006 By 40 Comments
… number of tables locked by transactions. Innodb does not lock tables for normal operation so number of tables locked normally stays 0, unless it is ALTER TABLE or similar statement, or if LOCK TABLES was…
Post: Implications of Metadata Locking Changes in MySQL 5.5
February 1, 2013 By 9 Comments
…0.000003 | | checking permissions | 0.000003 | | init | 0.000005 | | Opening tables | 0.000045 | | System lock | 0.000006 | | setup | 0.000016 | | creating table | 0.168283 | | After create | 0.000061 | | copy to tmp table | 0…
Post: The perils of InnoDB with Debian and startup scripts
January 28, 2009 By 13 Comments
… enough tables, but it is far worse on InnoDB. There are a few reasons why this happens — access to open an InnoDB table is serialized by a mutex, for one thing, and the mysqlcheck script opens all tables. One at a… 0 sec, process no 30034, OS thread id 1159956816 starting index read, thread declared inside InnoDB 500 mysql tables in use 7, locked 0 MySQL…
Post: InnoDB: look after fragmentation
November 5, 2009 By 12 Comments
…=InnoDB Table has 11864696 rows and takes Data_length: 698,351,616 bytes on disk The problem is that after restoring table from…: 11569733 # InnoDB_IO_r_ops: 38530 InnoDB_IO_r_bytes: 631275520 InnoDB_IO_r_wait: 0.204893 # InnoDB_rec_lock_wait: 0.000000 InnoDB_queue_wait: 0.000000 # InnoDB_pages…
Post: Improved InnoDB fast index creation
November 6, 2011 By 4 Comments
…0.000054 | | checking permissions | 0.000004 | | checking permissions | 0.000004 | | init | 0.000008 | | Opening tables | 0.000118 | | System lock | 0.000007 | | setup | 0.000027 | | creating table | 0.002255 | | After create | 0…
Post: SELECT LOCK IN SHARE MODE and FOR UPDATE
August 6, 2006 By 51 Comments
…. Here is simple example: SESSION1: mysql> begin; Query OK, 0 rows affected (0.00 sec) mysql> insert into tst values(1); Query… is missing in Innodb locking.? In my oppinion few rather important peices missing in Locking implementation of Innodb are: Lock table Innodb can lock tables but it will still… INTO MyISAMTable SELECT * FROM INNODBTable; – A lot of shared locks on Innodb table but no updates. Supporting MySQL hints “HIGH_PRIORITY” and “LOW…
