…clustered index, execute: ALTER TABLE `test`.`test` DROP INDEX `redundant`, ADD INDEX `redundant` (`col2`); # ######################################################################## # Summary of indexes…
Post: How to recover table structure from InnoDB dictionary
April 22, 2013 By 4 Comments
…index InnoDB will create one implicitely. Its name will be GEN_CLUST_INDEX. It doesn’t matter how the primary index gets created…
Post: Percona Server 5.5.30-30.2 rerelease fixes non-restart issue
April 24, 2013 By Leave a Comment
… and binary packages remain unchanged. Percona XtraDB Cluster was also affected by this bug and … key constraint which implied an implicit secondary index with the same name. Fixed by detecting … in the read_view_create_low() in most cases. This significantly improves InnoDB scalability on read-only…
Post: Statistics of InnoDB tables and indexes available in xtrabackup
September 14, 2009 By 6 Comments
… that PRIMARY key (which is the table by itself, as InnoDB is clustering data by primary key) takes 497839 pages ( 16KB each… feature to address this is in XtraDB/InnoDB plugin – fast index creation. With this feature, InnoDB creates indexes by sort, so page fill factor should be quite good. To check that, there is xtrabackup –stats for index domain_id created…
Post: Improved InnoDB fast index creation
November 6, 2011 By 4 Comments
… overall process of creating and loading an indexed table by creating the table with only the clustered index, and adding the secondary indexes after the data… to optimize dumps of InnoDB tables by first creating the table with only the clustered index and adding the secondary indexes after the data dump…
Post: Find and remove duplicate indexes
June 20, 2012 By 9 Comments
… both long and short index might be good for the query execution. Redundant suffixes on clustered index InnoDB uses a clustered index and that means that the secondary keys contains the primary key column. Let’s see the following example: mysql> show create…
Post: MySQL Indexing Best Practices: Webinar Questions Followup
August 16, 2012 By 4 Comments
…looking for a lot. This will cause data clustering done by these columns which can be …though. Q: Would you recommend creating an index in every table you create? Example: CREATE TABLE user_competition_entry user…in some cases for better index usage. Q: Is the b+ tree innodb index a single or double …
Post: Recovering Innodb table Corruption
July 4, 2008 By 22 Comments
…) 7, InnoDB: space id (if created with >= MySQL-4.1.1 and stored already) 6353 InnoDB: Page may be an index page where index id is 0 25556 InnoDB: (index… page” for clustered index is corrupted this method will not work well – in this case you may wish to use Innodb Recovery Toolkit…
Post: How to recover deleted rows from an InnoDB Tablespace
February 20, 2012 By 4 Comments
…_PAGE_INDEX/ 0-26 0-27 In this case, there are two indexes with the IDs 0-26 and 0-27. InnoDB has Clustered… with tables and indexes (with their IDs) to the error log. mysql (employees) > CREATE TABLE innodb_table_monitor (id int) ENGINE=InnoDB; TABLE: name employees/salaries, id 18, flags 1, columns 7, indexes 2, appr.rows 2844513 [...] INDEX…
Post: Heikki Tuuri Innodb answers - Part I
October 26, 2007 By 19 Comments
…create physically sorted indexes with Innodb (with index built by sort) this is when this should be helpful the most. Q3: Does Innodb secondary Indexes…. For big tables, a secondary index reserves different extents from the clustered index. Q4: Does Innodb ever merges sequential pages together if …
