innochecksum(1) — Linux manual page


INNOCHECKSUM(1)          MariaDB Database System         INNOCHECKSUM(1)

NAME         top

       innochecksum - offline InnoDB file checksum utility

SYNOPSIS         top

       innochecksum [options] file_name

DESCRIPTION         top

       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.

       •   -?, --help

           Displays help and exits.

       •   -c, --count

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

       •   -d, --debug

           Debug mode; prints checksums for each page.

       •   -e num, --end-page=#

           End at this page number.

       •   -i, --per-page-details

           Print out per-page detail information.

       •   -I, --info

           Synonym for --help.

       •   -l, --leaf

           Examine leaf index pages.

       •   -m num, --merge=#

           Leaf page count if merge given number of consecutive pages.

       •   -p num, --page-num=#

           Check only this page number.

       •   -s num, --start-page

           Start at this page number.

       •   -u, --skip-corrupt

           Skip corrupt pages.

       •   -v, --verbose

           Verbose mode; print a progress indicator every five seconds.

       •   -V, --version

           Displays version information and exits.

COPYRIGHT         top

       Copyright 2007-2008 MySQL AB, 2008-2010 Sun Microsystems, Inc.,
       2010-2020 MariaDB Foundation

       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
       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
       02110-1335 USA or see

SEE ALSO         top

       For more information, please refer to the MariaDB Knowledge Base,
       available online at

AUTHOR         top

       MariaDB Foundation (

COLOPHON         top

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       This page was obtained from the project's upstream Git repository
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MariaDB 10.8                   15 May 2020               INNOCHECKSUM(1)