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This is a manual merge from mysql-5.1-innodb of: revno: 3618 revision-id: vasil.dimov@oracle.com-20100930124844-yglojy7c3vaji6dx parent: vasil.dimov@oracle.com-20100930102618-s9f9ytbytr3eqw9h committer: Vasil Dimov <vasil.dimov@oracle.com> branch nick: mysql-5.1-innodb timestamp: Thu 2010-09-30 15:48:44 +0300 message: Fix Bug#56340 innodb updates index stats too frequently after non-index updates This is a simple optimization issue. All stats are related to only indexed columns, index size or number of rows in the whole table. UPDATEs that touch only non-indexed columns cannot affect stats and we can avoid calling the function row_update_statistics_if_needed() which may result in unnecessary I/O. Approved by: Marko (rb://466) In addition to the above message: we know that row_update_cascade_for_mysql() (the other place where row_update_statistics_if_needed is called) always updates indexed columns (FK-related), so there is no need to add this cond there. |
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| .. | ||
| row0ext.c | ||
| row0ins.c | ||
| row0merge.c | ||
| row0mysql.c | ||
| row0purge.c | ||
| row0row.c | ||
| row0sel.c | ||
| row0uins.c | ||
| row0umod.c | ||
| row0undo.c | ||
| row0upd.c | ||
| row0vers.c | ||