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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, --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.

   *   -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.

COPYRIGHT

   Copyright 2007-2008 MySQL AB, 2008-2010 Sun Microsystems, Inc.,
   2010-2015 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 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 MariaDB Knowledge Base,
   available online at https://mariadb.com/kb/

AUTHOR

   MariaDB Foundation (http://www.mariadb.org/).



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