…maintained in separate tables and there also exists a users_groups table to define the …send all your writes to one node. This should prevent the deadlock errors, but will not change the lock…()); Conclusion Choosing a system to replicate your data to a distributed system requires tradeoffs….
Post: Implications of Metadata Locking Changes in MySQL 5.5
February 1, 2013 By 9 Comments
… the meta data locks just after the table with the new structure had been created and populated with data but before the old table was….000001 | | Sorting result | 0.000002 | | Sending data | 0.000040 | | end | 0.000003 | | query end | 0.000002 | | closing tables | 0.000003 | | freeing items | 0…
Post: How fast is FLUSH TABLES WITH READ LOCK?
April 24, 2010 By 30 Comments
… entire system is still locked. After all the data is finished, the FLUSH TABLES WITH READ LOCK command completes and sends its response to the client that issued it. Holding the lock…
Post: Innodb Table Locks
July 31, 2012 By 4 Comments
… sec mysql tables in use 2, locked 0 MySQL thread id 53038, OS thread handle 0x7ff759b22700, query id 3918786 localhost root Sending data select… localhost root Sending data select count(*) from sbtest,sbtest x lock in share mode TABLE LOCK table `sbtest`.`sbtest` trx id 12305 lock mode IS RECORD LOCKS space…
Post: How FLUSH TABLES WITH READ LOCK works with Innodb Tables
March 23, 2012 By 20 Comments
… | Sending data | select count(*) from A,B | 0 | 0 | 2359297 | | 10290 | root | localhost | NULL | Query | 317 | Waiting for table flush | flush tables with read lock… | Sending data | select count(*) from A,B | 0 | 0 | 2359297 | | 10290 | root | localhost | NULL | Query | 681 | Waiting for table flush | flush tables with read lock…
Post: INSERT INTO ... SELECT Performance with Innodb tables.
July 12, 2006 By 22 Comments
… statement and possibly result in different data than on master. Locking rows in the source table while reading them protects from this effect… mysql tables in use 1, locked 1 2539 lock struct(s), heap size 224576 MySQL thread id 1794751, query id 6994931 localhost root Sending data insert into test select * from sample ——– As you can see INSERT… SELECT has a lot of lock structs, which…
Post: Write contentions on the query cache
September 5, 2012 By 5 Comments
… tables | 0.000021 | | System lock | 0.000009 | | init | 0.000022 | | optimizing | 0.000013 | | statistics | 0.000075 | | preparing | 0.000016 | | executing | 0.000003 | | Sending data… | 0.000002 | | Sending data | 0.003407 | | Waiting for query cache lock | 0.000003 | | Waiting on query cache mutex | 0.000003 | | Sending data | 0.003515 | | Waiting…
Post: SHOW INNODB STATUS walk through
July 17, 2006 By 40 Comments
… inside InnoDB 442 mysql tables in use 1, locked 0 MySQL thread id 8079, query id 728899 localhost root Sending data select sql_calc… inside InnoDB 166 mysql tables in use 1, locked 0 MySQL thread id 8078, query id 728898 localhost root Sending data select sql_calc… inside InnoDB 114 mysql tables in use 1, locked 0 MySQL thread id 8077, query id 728897 localhost root Sending data select sql_calc…
Post: The perils of InnoDB with Debian and startup scripts
January 28, 2009 By 13 Comments
… | 7 | debian-sys-maint | NULL | CHECK TABLE tableA… | 739 | user | | NULL | 4776 | user | | NULL | 6318 | user | Sending data | insert into tableB… | 6322 | … index read, thread declared inside InnoDB 500 mysql tables in use 7, locked 0 MySQL thread id 6424, query id …
Post: Ultimate MySQL variable and status reference list
January 8, 2011 By 4 Comments
…table_definition_cacheblogpercona.commanual table_lock_wait_timeoutblogpercona.commanual Table_locks_immediateblogpercona.commanual Table_locks_waitedblogpercona.commanual table_open_cacheblogpercona.commanual table…
