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.
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
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.
Verbose mode; print a progress indicator every five seconds.
Copyright 2007-2008 MySQL AB, 2008-2010 Sun Microsystems, Inc.
This documentation is free software; you can redistribute it and/or modify it only under
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version 2 of the License.
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PURPOSE. See the GNU General Public License for more details.
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Boston, MA 02110-1301 USA or see http://www.gnu.org/licenses/.
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/.
Sun Microsystems, Inc. (http://www.mysql.com/).
MySQL 5.1 04/06/2010 INNOCHECKSUM(1)