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Re: Partitioning performance issues // 5.1
Posted by: bob hagemann
Date: April 18, 2010 04:51PM

We're very much looking forward to the improvements talked about in the forum post linked below, and the "Partitioning Under the Hood" talk at the MySQL conference, to prune partitions prior to locking for Insert/Update. We have several large (billion row) MyISAM tables which we highly partitioned, and while this improved some tasks we were disappointed to see no improvement to concurrent inserts due to the locking of all partitions.

"What we will try to do in 5.1 is to improve the lock sort algorithm and in a later version see if we can do the pruning before locking, and that way only lock the needed partitions. (Pruning would also need to support insert, update and delete...)",278885,281256#msg-281256

"In 5.5 a new Meta Data Locking scheme is added which allow us to move the pruning step right after the table meta data lock and before the open/lock calls, so we also can prune open and locking. Allows to prune inserts too. Not yet implemented."
Partitioning Under the Hood in MySQL 5.5

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February 17, 2010 10:53AM
February 19, 2010 10:11AM
Re: Partitioning performance issues // 5.1
April 18, 2010 04:51PM

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