innochecksum


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 cause
       InnoDB to deliberately shut down a running server, it may be preferable
       to use this tool rather than waiting for an in-production server to
       encounter the damaged pages.  innochecksum supports files up to 2GB in
       size.

       innochecksum does not support tablespaces that contain compressed
       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.

       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 MySQL Reference Manual, which
       may already be installed locally and which is also available online at
       http://dev.mysql.com/doc/.

AUTHOR
       Oracle Corporation (http://dev.mysql.com/).



MySQL 5.5                         11/26/2016                   INNOCHECKSUM(1)
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