Comments on: JOIN Performance & Charsets http://www.mysqlperformanceblog.com/2008/10/21/join-performance-charsets/ Percona's MySQL & InnoDB performance and scalability blog Sat, 11 Feb 2012 16:45:54 +0000 hourly 1 http://wordpress.org/?v=3.2.1 By: MLBR http://www.mysqlperformanceblog.com/2008/10/21/join-performance-charsets/comment-page-1/#comment-770260 MLBR Thu, 29 Jul 2010 19:06:57 +0000 http://www.mysqlperformanceblog.com/?p=514#comment-770260 Any insight into this CHARSET perfomance issue related to ENUMs? http://bugs.mysql.com/bug.php?id=55606 Any insight into this CHARSET perfomance issue related to ENUMs?

http://bugs.mysql.com/bug.php?id=55606

]]> By: Jatin Mehta http://www.mysqlperformanceblog.com/2008/10/21/join-performance-charsets/comment-page-1/#comment-742814 Jatin Mehta Sat, 03 Apr 2010 08:54:06 +0000 http://www.mysqlperformanceblog.com/?p=514#comment-742814 I have one problem with join. I need to reduce query time to it optimized level. Details are as under QUERY: SELECT SQL_CALC_FOUND_ROWS p.*, FLOOR(p.prodratingtotal/p.prodnumratings) AS prodavgrating, 0 AS prodgroupdiscount, pi.* , (IF(p.prodname='gold', 10000, 0) + IF(p.prodcode='gold', 10000, 0) + ((MATCH (ps.prodname) AGAINST ('gold')) * 10) + MATCH (ps.prodname,ps.prodcode,ps.proddesc,ps.prodsearchkeywords) AGAINST ('gold')) AS score FROM products p LEFT JOIN product_images pi ON (p.productid = pi.imageprodid AND pi.imageisthumb = 1) INNER JOIN product_search ps ON p.productid = ps.productid WHERE p.prodvisible = 1 AND (ps.prodcode = 'gold' OR TRUE) AND (MATCH (ps.prodname,ps.prodcode,ps.proddesc,ps.prodsearchkeywords) AGAINST ('gold')) ORDER BY score DESC LIMIT 20 EXECUTION TIME: 2.5000+ seconds TABLES DATA: products: 31,000 records product_images: 92,000 records product_search: 57,000 records EXPLAIN COMMAND WITH ABOVE QUERY: 1 SIMPLE ps fulltext prodname prodname 0 1 Using where; Using temporary; Using filesort 1 SIMPLE p eq_ref PRIMARY,i_products_rating_vis,i_products_added_vis,i_products_sortorder_vis PRIMARY 4 shoppingcart_5521.ps.productid 1 Using where 1 SIMPLE pi ref i_product_images_imageprodid i_product_images_imageprodid 5 shoppingcart_5521.p.productid,const 1 I have one problem with join.

I need to reduce query time to it optimized level. Details are as under

QUERY:
SELECT SQL_CALC_FOUND_ROWS p.*, FLOOR(p.prodratingtotal/p.prodnumratings) AS prodavgrating, 0 AS prodgroupdiscount, pi.* , (IF(p.prodname=’gold’, 10000, 0) + IF(p.prodcode=’gold’, 10000, 0) + ((MATCH (ps.prodname) AGAINST (‘gold’)) * 10) + MATCH (ps.prodname,ps.prodcode,ps.proddesc,ps.prodsearchkeywords) AGAINST (‘gold’)) AS score FROM products p LEFT JOIN product_images pi ON (p.productid = pi.imageprodid AND pi.imageisthumb = 1) INNER JOIN product_search ps ON p.productid = ps.productid WHERE p.prodvisible = 1 AND (ps.prodcode = ‘gold’ OR TRUE) AND (MATCH (ps.prodname,ps.prodcode,ps.proddesc,ps.prodsearchkeywords) AGAINST (‘gold’)) ORDER BY score DESC LIMIT 20
EXECUTION TIME: 2.5000+ seconds
TABLES DATA:
products: 31,000 records
product_images: 92,000 records
product_search: 57,000 records

EXPLAIN COMMAND WITH ABOVE QUERY:
1 SIMPLE ps fulltext prodname prodname 0 1 Using where; Using temporary; Using filesort
1 SIMPLE p eq_ref PRIMARY,i_products_rating_vis,i_products_added_vis,i_products_sortorder_vis PRIMARY 4 shoppingcart_5521.ps.productid 1 Using where
1 SIMPLE pi ref i_product_images_imageprodid i_product_images_imageprodid 5 shoppingcart_5521.p.productid,const 1

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