lp:percona-server/rnt-5.1
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Branch information
- Owner:
- Percona core
- Status:
- Abandoned
Recent revisions
- 217. By Oleg Tsarev
- 216. By Oleg Tsarev
-
merge lp:~tsarev/percona-server/18205_07_slave_type_conversions_error_on_truncate.patch
- 214. By Oleg Tsarev
-
merge lp:~tsarev/percona-server/18205_05_slave_type_conversions_error_on_truncate.patch
- 213. By Oleg Tsarev
- 210. By Oleg Tsarev
- 208. By Oleg Tsarev
-
Return back Percona's "innodb_
stats_method= nulls_ignored" algorithm. Related Launchpad bug #892405
Related MySQL bug http://bugs.mysql. com/bug. php?id= 63320 I added new value "nulls_
ignored_ exact" for variable innodb_ stats_method. Current upsteam "nulls_ignored" algorithm calculate not_null values on every estimated (random) page, and after that try to approximates total value count.
Unfortunately, this algorithm works incorrectly on mostly null indexes (see MySQL Bug #63320).Percona'a algorithm excludes from estimation pages with nulls, calculates the count of different values and approximates total value count.
This algorithm works correctly on mostly null indexes, but has limitation - it works correctly just on one-column-key indexes. On compound-keys algorithm can works incorrectly (I didn't test this).
Unfortunately, I can't imagine now how to discard this limitation.
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- lp:percona-server/5.5