Fast Index Creation¶
Disabling Fast Index Creation¶
Fast index creation was implemented in MySQL as a way to speed up the process of adding or dropping indexes on tables with many rows. However, cases have been found in which fast index creation creates an inconsistency between MySQL and InnoDB data dictionaries.
This feature implements a session variable that disables fast index creation. This causes indexes to be created in the way they were created before fast index creation was implemented. While this is slower, it avoids the problem of data dictionary inconsistency between MySQL and InnoDB.
Tunable buffer size for fast index creation¶
Percona Server supports tunable buffer size for fast index creation in InnoDB. This value was calculated based on the merge block size (which was hardcoded to 1 MB) and the minimum index record size. By adding the session variable
innodb_merge_sort_block_size block size that is used in the merge sort can now be adjusted for better performance.
Version Specific Information¶
Command Line: Yes Config File: No Scope: Local Dynamic: Yes Variable Type: Boolean Default Value: ON Range: ON/OFF
Command Line: Yes Config File: Yes Scope: Global Dynamic: Yes Variable Type: ULONG Default Value: 1048576 (1M) Range: 1048576 - 1073741824 (1G)