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mysql_explain_log(1)         MySQL Database System        mysql_explain_log(1)


       mysql_explain_log - use EXPLAIN on statements in query log


       mysql_explain_log [options] < log_file


       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:

       o   --help, -?

           Display a help message and exit.

       o   --date=YYMMDD, -d YYMMDD

           Select entries from the log only for the given date.

       o   --host=host_name, -h host_name

           Connect to the MySQL server on the given host.

       o   --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, "End-User Guidelines for Password

       o   --printerror=1, -e 1

           Enable error output.

       o   --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.

       o   --user=user_name, -u user_name

           The MySQL user name to use when connecting to the server.


       Copyright 2007-2008 MySQL AB, 2009 Sun Microsystems, Inc.

       This documentation is free software; you can redistribute it and/or
       modify it only under the terms of the GNU General Public License as
       published by the Free Software Foundation; version 2 of the License.

       This documentation is distributed in the hope that it will be useful,
       but WITHOUT ANY WARRANTY; without even the implied warranty of
       General Public License for more details.

       You should have received a copy of the GNU General Public License along
       with the program; if not, write to the Free Software Foundation, Inc.,
       51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA or see


       For more information, please refer to the MySQL Reference Manual, which
       may already be installed locally and which is also available online at


       Sun Microsystems, Inc. (

MySQL 5.0                         11/09/2009              mysql_explain_log(1)

Mac OS X 10.6Server - Generated Wed Apr 14 06:05:28 CDT 2010
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