Comments on: DBJ – Advanced MySQL Replication – Improving Performance http://oracleopensource.com/2009/02/11/dbj-advanced-mysql-replication-improving-performance/ two worlds inexorably colliding Tue, 05 Jan 2010 08:35:53 -0500 http://wordpress.org/?v=2.8.5 hourly 1 By: Sheeri Cabral http://oracleopensource.com/2009/02/11/dbj-advanced-mysql-replication-improving-performance/comment-page-1/#comment-1913 Sheeri Cabral Wed, 11 Feb 2009 22:27:53 +0000 http://oracleopensource.com/2009/02/11/dbj-advanced-mysql-replication-improving-performance/#comment-1913 The #1 cause of this type of slave lag that I have seen is poor query/schema design. "Optimize your schema, data and queries" should be the very first thing to do. GCN had a great article a while back on "Secrets of Optimization" written by Joab Jackson. http://gcn.com/Articles/2008/08/15/Secrets-of-optimization.aspx The article goes into optimizing queries and schema. However, there's a third aspect, optimizing your data. This means having as small a data set as possible. Can you move historical data to another table? Can you use a SMALLINT instead of an INT? Optimizing data/schema/queries solves 90% or more of common replication issues, and unfortunately did not end up on the list. The #1 cause of this type of slave lag that I have seen is poor query/schema design. “Optimize your schema, data and queries” should be the very first thing to do. GCN had a great article a while back on “Secrets of Optimization” written by Joab Jackson.

http://gcn.com/Articles/2008/08/15/Secrets-of-optimization.aspx

The article goes into optimizing queries and schema. However, there’s a third aspect, optimizing your data. This means having as small a data set as possible. Can you move historical data to another table? Can you use a SMALLINT instead of an INT?

Optimizing data/schema/queries solves 90% or more of common replication issues, and unfortunately did not end up on the list.

]]> By: William Newton http://oracleopensource.com/2009/02/11/dbj-advanced-mysql-replication-improving-performance/comment-page-1/#comment-1911 William Newton Wed, 11 Feb 2009 20:35:38 +0000 http://oracleopensource.com/2009/02/11/dbj-advanced-mysql-replication-improving-performance/#comment-1911 I don't think using MyIsam on the slave is such a good idea. Reads block writes with MyIsam. So if you have a slave for the long running read only queries .. MyIsam will cause replication to fall behind. I don’t think using MyIsam on the slave is such a good idea. Reads block writes with MyIsam. So if you have a slave for the long running read only queries .. MyIsam will cause replication to fall behind.

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