…: How many MySQL records were recovered and how many were lost. Until now there was no way to …big difference. There are two ways to know how many records an InnoDB page stores. The index page …record at offset: 0×70 (112) Page is good Format: COMPACT, Records list: Valid, Expected records: (200 200) …
Post: How to recover deleted rows from an InnoDB Tablespace
February 20, 2012 By 4 Comments
… explained how it could be possible to recover, on some specific cases, a single table from a full backup in order to save… format is COMPACT. More information about row format on the following link: http://dev.mysql.com/doc/refman/5.5/en/innodb-physical… and indexes (with their IDs) to the error log. mysql (employees) > CREATE TABLE innodb_table_monitor (id int) ENGINE=InnoDB; TABLE: name employees/salaries…
Post: Data compression in InnoDB for text and blob fields
May 30, 2012 By 2 Comments
… stored in overflow pages. COMPACT became the default after MySQL 5.0.3 and has a more compact representation for nulls and variable… with innodb_file_per_table=1 as the InnoDB system tablespace cannot be compressed, see this page for further details on how to enable compression for a table. To utilize…
Post: How to calculate a good InnoDB log file size
November 21, 2008 By 38 Comments
… how many MB have been written to the log in one minute. (The technique I showed here works on all versions of MySQL… needs to be a lot smaller than it’s configured to be. In part that’s because InnoDB‘s log entries are very compact. The other reason is that the common advice to…
Post: How to estimate time it takes Innodb to Recover ?
May 9, 2007 By 7 Comments
…be more compact and so same log length will contain more log records which will need to be…transactions. As MySQL 5.0 these seems to be done in the background. In the future to increase …expect system to handle and crash Innodb few times to see how long it takes Innodb to recover. I’d recommend to …
Post: SHOW INNODB STATUS walk through
July 17, 2006 By 40 Comments
… through SHOW INNODB STATUS output, showing what you can learn from SHOW INNODB STATUS output and how to use this info to improve MySQL Performance. To start with basics SHOW INNODB STATUS is command which… Record lock, heap no 5 PHYSICAL RECORD: n_fields 4; compact format; info bits 0 0: len 4; hex 80000002; asc…
Post: Feature preview: Compact backups in Percona XtraBackup
January 29, 2013 By 11 Comments
… in theory. To create a compact backup you should use innobackupex –compact and it will create a backup where all InnoDB tables contain only Primary Keys and not secondary. It allows to safe some space on a backup storage. How much? Well, it depends on how many indexes you have…
Post: Heikki Tuuri answers to Innodb questions, Part II
November 4, 2007 By 13 Comments
… of concurrent writes to about 6 tables, what version of Innodb/MySQL would you recommend? …benchmark to be sure. In Innodb besides scalability changes in later 5.0 series compact row …to the first file in the log file group? HT: InnoDB writes the checkpoint information to the first file. Q31: How…
Post: High-Performance Click Analysis with MySQL
December 22, 2008 By 13 Comments
…me to my next point: Use InnoDB Assuming that you will use the stock MySQL server, InnoDB …compactly on disk as [Compressed] MyISAM or Archive. These are just some ideas I’m throwing around — the point is to…you still have to think about how to avoid enormous tables that are hard to maintain, back up…
Post: How much memory Innodb locks really take ?
July 13, 2006 By 11 Comments
…InnoDB DEFAULT CHARSET=utf8 mysql> show table status like “sample” \G; *************************** 1. row *************************** Name: sample Engine: InnoDB Version: 10 Row_format: Compact…
