… a lot about using short PRIMARY KEYs with Innodb tables due to the fact all other key will refer to the rows by… themselves were stored on the disk of course but meta data such as original image sizes, file size as well as thumbnail location…=InnoDB; Why did I use this solution compared to others: Innodb Tables – This table is getting much more reads than writes so transactional overhead of…
Post: InnoDB TABLE/INDEX stats
March 20, 2010 By 7 Comments
… table show statistics about InnoDB tables ( taken from InnoDB data dictionary). INNODB_TABLE_STATS is | table_name | table name in InnoDB internal style (‘database/table‘) | | rows | estimated number of all rows | | clust_size | cluster index (table…
Post: How much space does empty Innodb table take ?
December 16, 2008 By 7 Comments
… row size for table with one row: mysql> show table status like “test_innodb” \G *************************** 1. row *************************** Name: test_innodb Engine: InnoDB …all. This tells you it is not about tables which contain couple of rows which can take a lot of space in Innodb. Tables…
Post: Beware the Innodb Table Monitor
November 29, 2011 By 2 Comments
…TABLE innodb_table_monitor (a INT) ENGINE=INNODB; This, primitively, tells Innodb that it should start the Table monitor. The monitor itself dumps the contents of…appr.key vals 1, leaf pages 1, size pages 1 FIELDS: FOR_NAME ID … so we could confirm if Innodb really did have all the indexes or not. …
Post: Recovering Innodb table Corruption
July 4, 2008 By 22 Comments
… can create or drop Innodb tables): mysql> optimize table test; +———–+———-+———-+———————————-+ | Table | Op | Msg_type | Msg_text | …store all data it could recover to MyISAM table. Using series of …much data as possible. Row size can be good help to…
Post: Innodb Table Locks
July 31, 2012 By 4 Comments
…tables in use 2, locked 2 8316 lock struct(s), heap size…Innodb “converts” table lock to “no lock” hence eliminating conflicts on MySQL level table locks for most queries. Summary: MySQL Table level locks and Innodb Table…
Post: Lost innodb tables, xfs and binary grep
November 9, 2010 By 12 Comments
… file system Server was running innodb_file_per_table There was a production master and two slaves, all had same setting Developer accidentally… wrong machine (production master) All slaves followed and dropped their copy of the data The important tables were all InnoDB Having a backup, customer has… seemed somewhat complicated, but it really wasn’t – all of the columns were fixed size – 2bytes each, so the thing we had to…
Post: Efficient Boolean value storage for Innodb Tables
April 23, 2008 By 6 Comments
…table – myisam_data_pointer_size is 6 default plus we need space for delete flag which makes 7 minimum row size…for MyISAM and Innodb tables, however it is not as convenient to work with. Using NULL as one of flag …set (0.22 sec) Should you go and change all flags to use this approach ? I do not …
Post: INSERT INTO ... SELECT Performance with Innodb tables.
July 12, 2006 By 22 Comments
…Innodb tables probably got use to the fact Innodb tables perform non locking reads, …proper order. Gets pretty complicated ? Well all you need to know it had…33504 n bits 328 index `j` of table `test/sample` trx id 0 42304626… InnoDB 3 mysql tables in use 1, locked 1 2539 lock struct(s), heap size…
Post: Adjusting Innodb for Memory resident workload
March 25, 2009 By 11 Comments
…application so all or most of their database (frequently Innodb) fits into memory. If all tables fit in Innodb …XTRADB. Preload It is possible to preload all innodb tables (ibdata, .ibd files) on the system start -…minutes. It should be possible to just size Innodb logs so they are not cycled through…
