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INNOCHECKSUM(1)              MySQL Database System             INNOCHECKSUM(1)

       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. As of MySQL 5.6.16, innochecksum supports files greater
       than 2GB in size. Previously, innochecksum only supported files up to 2GB in size.

       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

       ?   -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 (C) 1997, 2016, 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

       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 (

MySQL 5.6                         07/08/2016                   INNOCHECKSUM(1)