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 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
innochecksum does not support tablespaces that contain compressed
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.
Print a count of the number of pages in the file.
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
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 (http://dev.mysql.com/).
MySQL 5.5 09/13/2017 INNOCHECKSUM(1)
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