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INNOCHECKSUM(1)                             MySQL Database System                            INNOCHECKSUM(1)



NAME
       innochecksum - offline InnoDB file checksum utility

SYNOPSIS
       innochecksum [options] file_name

DESCRIPTION
       innochecksum prints checksums for InnoDB files. This tool reads an InnoDB tablespace file, calculates
       the checksum for each page, compares the calculated checksum to the stored checksum, and reports
       mismatches, which indicate damaged pages. It was originally developed to speed up verifying the
       integrity of tablespace files after power outages but can also be used after file copies. Because
       checksum mismatches will cause InnoDB to deliberately shut down a running server, it can be
       preferable to use this tool rather than waiting for a server in production usage to encounter the
       damaged pages.

       innochecksum cannot be used on tablespace files that the server already has open. For such files, you
       should use CHECK TABLE to check tables within the tablespace.

       If checksum mismatches are found, you would normally restore the tablespace from backup or start the
       server and attempt to use mysqldump to make a backup of the tables within the tablespace.

       Invoke innochecksum like this:

           shell> innochecksum [options] file_name

       innochecksum supports the options described in the following list. For options that refer to page
       numbers, the numbers are zero-based.

       •   -c

           Print a count of the number of pages in the file.

       •   -d

           Debug mode; prints checksums for each page.

       •   -e num

           End at this page number.

       •   -p num

           Check only this page number.

       •   -s num

           Start at this page number.

       •   -v

           Verbose mode; print a progress indicator every five seconds.

COPYRIGHT
       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 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
       Sun Microsystems, Inc. (http://www.mysql.com/).



MySQL 5.0                                        11/09/2009                                  INNOCHECKSUM(1)