Comments for Alexander Rubin's Blog on MySQL http://www.arubin.org/blog MySQL, FullText Search, Performance, High Availability Thu, 10 Mar 2011 00:17:08 -0600 http://wordpress.org/?v=2.8.4 hourly 1 Comment on Reporting Queries with Sphinx by Nike Air Max Shoes http://www.arubin.org/blog/2009/10/01/reporting-queries-with-sphinx/comment-page-1/#comment-82 Nike Air Max Shoes Thu, 10 Mar 2011 00:17:08 +0000 http://www.arubin.org/blog/?p=16#comment-82 I found so many interesting in your blog especially on how to determine the topic. keep up the good work I found so many interesting in your blog especially on how to determine the topic. keep up the good work

]]> Comment on Using Dtrace to find queries creating disk temporary tables by Palmer Schreder http://www.arubin.org/blog/2009/10/02/using-dtrace-to-find-queries-creating-disk-temporary-tables/comment-page-1/#comment-81 Palmer Schreder Tue, 01 Mar 2011 08:29:31 +0000 http://www.arubin.org/blog/?p=36#comment-81 all new info,much appreciated,keep it comin' all new info,much appreciated,keep it comin’

]]> Comment on Reporting Queries with Sphinx by business management http://www.arubin.org/blog/2009/10/01/reporting-queries-with-sphinx/comment-page-1/#comment-80 business management Wed, 16 Feb 2011 23:59:18 +0000 http://www.arubin.org/blog/?p=16#comment-80 <strong>Good! Thank you! I always wanted to write in my site something like that. Can I take part of your post to my blog?...</strong> Hello, this is my first time i visit here. I found so many interesting in your blog especially on how to determine the topic. keep up the good work.... Good! Thank you! I always wanted to write in my site something like that. Can I take part of your post to my blog?…

Hello, this is my first time i visit here. I found so many interesting in your blog especially on how to determine the topic. keep up the good work….

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]]> Comment on Reporting Queries with Sphinx by Episode Guides http://www.arubin.org/blog/2009/10/01/reporting-queries-with-sphinx/comment-page-1/#comment-77 Episode Guides Fri, 24 Dec 2010 01:36:30 +0000 http://www.arubin.org/blog/?p=16#comment-77 Your blog is so usefull … keep up the good work!!!!... Your blog is so usefull … keep up the good work!!!!…

]]> Comment on Converting queries with OR to Union to ulitize indexes by akira http://www.arubin.org/blog/2010/11/22/converting-queries-with-or-to-union-to-ulitize-indexes/comment-page-1/#comment-76 akira Tue, 23 Nov 2010 16:21:03 +0000 http://www.arubin.org/blog/?p=69#comment-76 (select * from internalmail where senderaddress_id = 247 and mail_timestamp > ‘2010-08-19 12:30:47′) union all (select * from internalmail where recipientaddress_id IN (0, 247) and mail_timestamp > ‘2010-08-19 12:30:47′) (select * from internalmail where senderaddress_id = 247 and mail_timestamp > ‘2010-08-19 12:30:47′)
union all
(select * from internalmail where recipientaddress_id IN (0, 247) and mail_timestamp > ‘2010-08-19 12:30:47′)

]]> Comment on Converting queries with OR to Union to ulitize indexes by arubin http://www.arubin.org/blog/2010/11/22/converting-queries-with-or-to-union-to-ulitize-indexes/comment-page-1/#comment-75 arubin Tue, 23 Nov 2010 10:38:04 +0000 http://www.arubin.org/blog/?p=69#comment-75 As the query contains "OR" in the query those indexes will not be used. See update. As the query contains “OR” in the query those indexes will not be used. See update.

]]> Comment on Converting queries with OR to Union to ulitize indexes by huarong http://www.arubin.org/blog/2010/11/22/converting-queries-with-or-to-union-to-ulitize-indexes/comment-page-1/#comment-74 huarong Tue, 23 Nov 2010 01:31:49 +0000 http://www.arubin.org/blog/?p=69#comment-74 select * from internalmail where (i_senderaddress = 247 or i_recipientaddress = 247 or i_recipientaddress = 0) and dt_timestamp > '2010-08-01 12:30:47' order by dt_timestamp desc In this case, will these two combined index: (dt_timestamp, i_senderaddress) and (dt_timestamp, i_recipientaddress ) work? select * from internalmail
where (i_senderaddress = 247 or i_recipientaddress = 247 or i_recipientaddress = 0)
and dt_timestamp > ‘2010-08-01 12:30:47′
order by dt_timestamp desc

In this case, will these two combined index: (dt_timestamp, i_senderaddress) and (dt_timestamp, i_recipientaddress ) work?

]]> Comment on Why mysqldump is converting my tables from InnoDB to MyISAM? by arubin http://www.arubin.org/blog/2010/11/12/why-mysqldump-is-converting-my-tables-from-innodb-to-myisam/comment-page-1/#comment-73 arubin Wed, 17 Nov 2010 13:04:47 +0000 http://www.arubin.org/blog/?p=50#comment-73 Shantanu, "default-storage-engine=InnoDB" is a good option. In one case thou it can affect performance of your queries: If your queries will create temporary tables with "create temporary table aaa (i int ... )" without specifying storage engine, InnoDB will be used for temporary tables. Innodb for temp tables can be slow, especially with InnoDB_file_per_table option (when each temporary table will create its own tablespace). Shantanu,

“default-storage-engine=InnoDB” is a good option. In one case thou it can affect performance of your queries:
If your queries will create temporary tables with “create temporary table aaa (i int … )” without specifying storage engine, InnoDB will be used for temporary tables. Innodb for temp tables can be slow, especially with InnoDB_file_per_table option (when each temporary table will create its own tablespace).

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