…down MySQL Server and copying data, using LVM, Using Innodb Hot Backup Tool, Using another Slave, using … of information for binary log position SHOW MASTER STATUS – this shows position as master writes its own …Retry: 60 Master_Log_File: db01-bin.003814 Read_Master_Log_Pos: 744615652 Relay_Log_File: …
Post: Innodb undo segment size and transaction isolation
January 12, 2011 By 3 Comments
… this case. If not you can check history size in SHOW INNODB STATUS: History list length 4000567 Mind however this size is in… as possible. In default (REPEATABLE-READ) mode Innodb has to maintain versions back to the first data read the oldest transaction has performed… and Innodb is smart enough to figure how far it can purge the data, it even can be seen in SHOW INNODB STATUS: Trx read…
Post: The perils of InnoDB with Debian and startup scripts
January 28, 2009 By 13 Comments
…processes in ‘statistics’ status. Why is that happening? Look at SHOW INNODB STATUS: ===================================== 090128 8:29:03 INNODB MONITOR OUTPUT ===================================== …OS thread id 1159956816 starting index read, thread declared inside InnoDB 500 mysql tables in use 7, …
Post: How much memory Innodb locks really take ?
July 13, 2006 By 11 Comments
…) | +———-+ | 1638400 | +———-+ 1 row in set (7.02 sec) Looking at SHOW INNODB STATUS we can see: History list length 5 Total number of… id 7429, query id 24542 localhost root show innodb status Note, running statement in consistent read mode which does not set any locks is…
Post: INSERT INTO ... SELECT Performance with Innodb tables.
July 12, 2006 By 22 Comments
Everyone using Innodb tables probably got use to the fact Innodb tables perform non locking reads, meaning unless you use some modifiers such… joins. It is important for tables which is being read to be Innodb – even if writes are done in MyISAM table. So…. To complete this article I should show how wait caused by this statement will look in SHOW INNODB STATUS: —TRANSACTION 0 42304626, ACTIVE 14…
Post: Can Innodb Read-Ahead reduce read performance ?
June 26, 2007 By 2 Comments
… average outstanding IO requests to the disk. Lets look at SHOW INNODB STATUS: ——– FILE I/O ——– I/O thread 0 state: waiting for… / 1000 ————– ROW OPERATIONS ————– 8 queries inside InnoDB, 3 queries in queue 12 read views open inside InnoDB Main thread process no. 3956, id…
Post: InnoDB compression woes
May 20, 2011 By 14 Comments
InnoDB compression is getting some traction, and I see quite contradictory ….lua –oltp-tables-count=16 –oltp-table-size=5000000 –oltp-read-only=on –rand-init=on –num-threads=16 –max-requests… is 7%. Obviously we have some mutex serialization problem. Analyzing SHOW INNODB STATUS (SEMAPHORES) for workload with compression tables we can see 1…
Post: Announcing Percona XtraDB Storage Engine: a Drop-in Replacement for Standard InnoDB
December 16, 2008 By 25 Comments
… of standard InnoDB, so you can always learn what your engine can do. documentation Improvements to SHOW INNODB STATUS. We’…InnoDB IO. Improvements of InnoDB IO subsystem, such as multiple read and write threads, read-ahead control, control io capacity and adaptive checkpointing. documentation InnoDB…
Post: Reasons for run-away main Innodb Tablespace
June 10, 2010 By 2 Comments
… have the graphs you need. If you’re looking at SHOW INNODB STATUS this is how you can see Insert Buffer Size: Ibuf…, Innodb will be unable to purge records for changes which are done after this transaction has started, in default REPEATABLE-READ isolation… Transactions the time is a bad measure. Having transaction in read only database open for weeks does no harm, however if…
Post: Some little known facts about Innodb Insert Buffer
January 13, 2009 By 12 Comments
…is made available. This means insert buffer can slow down read operations. The other way insert buffer is merged is … This can be very surprising. Stats about Innodb Insert Merge Buffer are available in SHOW INNODB STATUS output: ————————————- INSERT BUFFER AND ADAPTIVE HASH …
