https://ronaldbradford.com/tags/qep/ Recent content in QEP on Enterprise Data Architect | Principal Data Strategist | MySQL Subject Matter Expert | Author | Speaker Hugo -- gohugo.io en-us Mon, 13 Jun 2011 16:53:03 +0000 https://ronaldbradford.com/blog/utilizing-multiple-index-per-mysql-table-join-2011-06-13/ Mon, 13 Jun 2011 16:53:03 +0000 https://ronaldbradford.com/blog/utilizing-multiple-index-per-mysql-table-join-2011-06-13/ Historically it was considered that MySQL will generally use only one index per referenced table in a SQL query. In MySQL 5.0 the introduction of merge indexes enabled for certain conditions the possibility to utilize two indexes however this could result in worst performance then creating a better index. https://ronaldbradford.com/blog/extra-using-index-2011-06-13/ Mon, 13 Jun 2011 16:48:26 +0000 https://ronaldbradford.com/blog/extra-using-index-2011-06-13/ Many people consider this information in the MySQL Query Execution Plan (QEP) to indicate that the referenced table is using an index. It actually means that ONLY the index is used. https://ronaldbradford.com/blog/optimizing-update-and-delete-statements-2011-02-24/ Thu, 24 Feb 2011 04:01:01 +0000 https://ronaldbradford.com/blog/optimizing-update-and-delete-statements-2011-02-24/ Updated Nov 2011. Check out my latest book on Optimizing SQL Statements for more information. MySQL 5.6.2 also now provides an EXPLAIN syntax for UPDATE and DELETE statements natively. While most people look at performance optimizations for SELECT statements, UPDATE and DELETE statements are often overlooked. https://ronaldbradford.com/blog/explain-an-essential-tool-for-mysql-developers-2009-09-26/ Sat, 26 Sep 2009 15:46:45 +0000 https://ronaldbradford.com/blog/explain-an-essential-tool-for-mysql-developers-2009-09-26/ Just recently I came across the presentation “Bend SQL to your will with EXPLAIN” by Ligaya Turmelle via the Linked In – MySQL Speakers and Presenters group. Slides available at Slideshare . https://ronaldbradford.com/blog/we-need-more-cats-2009-08-22/ Sat, 22 Aug 2009 05:44:11 +0000 https://ronaldbradford.com/blog/we-need-more-cats-2009-08-22/ Before you think I’ve posted an animal story in my MySQL category please read on. For reference, The RAT and the CAT is something I wrote back in 2006, that explains the CAT part. https://ronaldbradford.com/blog/understanding-different-mysql-index-implementations-2009-07-22/ Thu, 23 Jul 2009 00:37:20 +0000 https://ronaldbradford.com/blog/understanding-different-mysql-index-implementations-2009-07-22/ It is important to know and understand that while indexing columns in MySQL will generally improve performance, using the appropriate type of index can make a greater impact on performance. https://ronaldbradford.com/blog/a-51-qep-nicety-using-join-buffer-2008-08-27/ Wed, 27 Aug 2008 15:56:23 +0000 https://ronaldbradford.com/blog/a-51-qep-nicety-using-join-buffer-2008-08-27/ I was surprised to find yesterday when using MySQL 5.1.26-rc with a client I’m recommending 5.1 to, some information not seen in the EXPLAIN plan before while reviewing SQL Statements.