Comments on: MySQL Query Cache WhiteSpace and comments http://www.mysqlperformanceblog.com/2008/03/20/mysql-query-cache-whitespace-and-comments/ Everything about MySQL Performance Tue, 02 Dec 2008 17:37:31 +0000 http://wordpress.org/?v=2.5.1 By: peter http://www.mysqlperformanceblog.com/2008/03/20/mysql-query-cache-whitespace-and-comments/#comment-257241 peter Tue, 25 Mar 2008 18:44:49 +0000 http://www.mysqlperformanceblog.com/2008/03/20/mysql-query-cache-whitespace-and-comments/#comment-257241 Thanks indeed there is an option to skip comments now and you should run mysql -c if you want do to this kind of resting with command line client Thanks indeed there is an option to skip comments now and you should run mysql -c if you want do to this kind of resting with command line client

]]> By: jenni s http://www.mysqlperformanceblog.com/2008/03/20/mysql-query-cache-whitespace-and-comments/#comment-257233 jenni s Tue, 25 Mar 2008 16:44:32 +0000 http://www.mysqlperformanceblog.com/2008/03/20/mysql-query-cache-whitespace-and-comments/#comment-257233 it's the same: the perl DBI doesn't strip out whitespace or comments, but it will strip out whitespace at the beginning of comments. it’s the same: the perl DBI doesn’t strip out whitespace or comments, but it will strip out whitespace at the beginning of comments.

]]> By: jenni s http://www.mysqlperformanceblog.com/2008/03/20/mysql-query-cache-whitespace-and-comments/#comment-257230 jenni s Tue, 25 Mar 2008 16:37:53 +0000 http://www.mysqlperformanceblog.com/2008/03/20/mysql-query-cache-whitespace-and-comments/#comment-257230 My understanding is that the mysql command line client now has an *option* to pass comments to the server, but it's disabled by default: http://bugs.mysql.com/bug.php?id=26215 I'm running the 5.0.56 client and server, and from the command line, my comment was stripped out (as seen by the query recorded in the slow query log). However, when I ran this php script: I *did* see the comment in the slow log: # Time: 080325 9:31:43 # User@Host: dbadmin[dbadmin] @ localhost [] # Query_time: 2 Lock_time: 0 Rows_sent: 230400 Rows_examined: 480 select /* my comment */ * from test.WEBSITE a, test.WEBSITE b; My understanding is that the mysql command line client now has an *option* to pass comments to the server, but it’s disabled by default:
http://bugs.mysql.com/bug.php?id=26215

I’m running the 5.0.56 client and server, and from the command line, my comment was stripped out (as seen by the query recorded in the slow query log). However, when I ran this php script:

I *did* see the comment in the slow log:
# Time: 080325 9:31:43
# User@Host: dbadmin[dbadmin] @ localhost []
# Query_time: 2 Lock_time: 0 Rows_sent: 230400 Rows_examined: 480
select /* my comment */ * from test.WEBSITE a, test.WEBSITE b;

]]> By: peter http://www.mysqlperformanceblog.com/2008/03/20/mysql-query-cache-whitespace-and-comments/#comment-255007 peter Fri, 21 Mar 2008 03:55:51 +0000 http://www.mysqlperformanceblog.com/2008/03/20/mysql-query-cache-whitespace-and-comments/#comment-255007 As far as I know PHP does not do any conversion to the query passed, so whitespace remains whitespace. Though you're welcome to check it with DBI and let me know if it is different :) As far as I know PHP does not do any conversion to the query passed, so whitespace remains whitespace. Though you’re welcome to check it with DBI and let me know if it is different :)

]]> By: Justin Swanhart http://www.mysqlperformanceblog.com/2008/03/20/mysql-query-cache-whitespace-and-comments/#comment-254967 Justin Swanhart Thu, 20 Mar 2008 23:10:03 +0000 http://www.mysqlperformanceblog.com/2008/03/20/mysql-query-cache-whitespace-and-comments/#comment-254967 Is PHP stripping off the whitespace from the front of the query? I'm curious if your same test run under Perl::DBI would behave consistently with the PHP test. Is PHP stripping off the whitespace from the front of the query? I’m curious if your same test run under Perl::DBI would behave consistently with the PHP test.

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