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MYSQL_EXPLAIN_LOG(1)                        MySQL Database System                       MYSQL_EXPLAIN_LOG(1)



NAME
       mysql_explain_log - use EXPLAIN on statements in query log

SYNOPSIS
       mysql_explain_log [options] < log_file

DESCRIPTION
       mysql_explain_log reads its standard input for query log contents. It uses EXPLAIN to analyze SELECT
       statements found in the input.  UPDATE statements are rewritten to SELECT statements and also
       analyzed with EXPLAIN.  mysql_explain_log then displays a summary of its results.

       The results may assist you in determining which queries result in table scans and where it would be
       beneficial to add indexes to your tables.

       Invoke mysql_explain_log like this, where log_file contains all or part of a MySQL query log:

          shell> mysql_explain_log [options] < log_file

       mysql_explain_log understands the following options:

         --help, -?

          Display a help message and exit.

         --date=YYMMDD, -d YYMMDD

          Select entries from the log only for the given date.

         --host=host_name, -h host_name

          Connect to the MySQL server on the given host.

         --password=password, -p password

          The password to use when connecting to the server.

          Specifying a password on the command line should be considered insecure. See Section 6.6, "Keeping
          Your Password Secure".

         --printerror=1, -e 1

          Enable error output.

         --socket=path, -S path

          For connections to localhost, the Unix socket file to use, or, on Windows, the name of the named
          pipe to use.

         --user=user_name, -u user_name

          The MySQL username to use when connecting to the server.

COPYRIGHT
       Copyright 1997-2007 MySQL AB

       This documentation is NOT distributed under a GPL license. Use of this documentation is subject to
       the following terms: You may create a printed copy of this documentation solely for your own personal
       use. Conversion to other formats is allowed as long as the actual content is not altered or edited in
       any way. You shall not publish or distribute this documentation in any form or on any media, except
       if you distribute the documentation in a manner similar to how MySQL disseminates it (that is,
       electronically for download on a Web site with the software) or on a CD-ROM or similar medium,
       provided however that the documentation is disseminated together with the software on the same
       medium. Any other use, such as any dissemination of printed copies or use of this documentation, in
       whole or in part, in another publication, requires the prior written consent from an authorized
       representative of MySQL AB. MySQL AB reserves any and all rights to this documentation not expressly
       granted above.

       Please email <docs@mysql.com> for more information.

SEE ALSO
       For more information, please refer to the MySQL Reference Manual, which may already be installed
       locally and which is also available online at http://dev.mysql.com/doc/

AUTHOR
       MySQL AB (http://www.mysql.com/)  This software comes with no warranty.



MySQL 5.0                                        07/04/2007                             MYSQL_EXPLAIN_LOG(1)