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 5.3.2.2, "End-User Guidelines for Password Security".

       ?   --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 user name to use when connecting to the server.

COPYRIGHT
       Copyright (C) 2008, 2010, Oracle and/or its affiliates. All rights reserved.

       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 MERCHANTABILITY or FITNESS FOR A PARTICULAR
       PURPOSE. See the GNU 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 http://www.gnu.org/licenses/.


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
       Oracle Corporation (http://dev.mysql.com/).



MySQL 5.0                                   05/05/2010                       MYSQL_EXPLAIN_LOG(1)