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       innochecksum - offline InnoDB file checksum utility


       innochecksum [options] file_name


       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.

       o   -c

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

       o   -d

           Debug mode; prints checksums for each page.

       o   -e num

           End at this page number.

       o   -p num

           Check only this page number.

       o   -s num

           Start at this page number.

       o   -v

           Verbose mode; print a progress indicator every five seconds.


       Copyright (C) 1997, 2010, Oracle and/or its affiliates. All rights

       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


       Oracle Corporation (