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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 following options. 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, 2008-2010 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.
       which is also available online at http://dev.mysql.com/doc/.

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



MySQL 5.1                                             04/06/2010                                      INNOCHECKSUM(1)