Percona Server improvements on FromDual GmbH

Corresponding I_S table for Percona Server

oli.sennhauser@fromdual.com (Oli Sennhauser) — Wed, 27 Jul 2011 15:10:29 +0200

Percona Server has had a buffer pool pages I_S table for a while, based on an earlier patch by Jeremy Cole or Eric Bergen, I think. However, I suspect that the Oracle implementation is likely to be safer. Some of the Percona I_S tables dealing with InnoDB internal information have had bugs, and I have become reluctant to use them on production systems. I am glad to see InnoDB providing their own implementation. Here is a link to the list of additional I_S tables provided in Percona Server: http://www.percona.com/docs/wiki/percona-server:features:indexes:index_info_schema_tables

HPM book documents this

oli.sennhauser@fromdual.com (Oli Sennhauser) — Sun, 10 Jul 2011 23:53:10 +0200

I believe that we documented the query cache’s behavior, and the actual mechanism for it, in High Performance MySQL 2nd Edition. The blog post looks like FromDual has found an additional bug, though.

I don’t think this is going to fundamentally change. The Query Cache is such a problem on so many servers that I can’t recommend it. If there is a 70% chance that it will help, and a 5% chance that it will cause complete system lockups, it has to be disabled.

Percona Server improvements

oli.sennhauser@fromdual.com (Oli Sennhauser) — Fri, 22 Apr 2011 15:31:47 +0200

Percona Server has an option to limit amount of memory consumed by dictionary entries. This might be similar to what is in 5.6 from Oracle; I have not looked at the 5.6 code yet. We created this feature specifically for hosting providers :-)

There are a number of other improvements for shared hosting providers, too, such as “don’t crash the whole server when a single table gets a corruption” or “allow import/export of individual tables to another server”.