INNOCHECKSUM(1) MySQL Database System INNOCHECKSUM(1)NAMEinnochecksum - offline InnoDB file checksum utility
SYNOPSISinnochecksum [options] file_name
DESCRIPTIONinnochecksum 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 options described in the following list. 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.
· -e num
End at this page number.
· -p num
Check only this page number.
· -s num
Start at this page number.
Verbose mode; print a progress indicator every five seconds.
Copyright 2007-2008 MySQL AB, 2009 Sun Microsystems, Inc.
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
For more information, please refer to the MySQL Reference Manual, which
may already be installed locally and which is also available online at
Sun Microsystems, Inc. (http://www.mysql.com/).
MySQL 5.1 09/04/2009 INNOCHECKSUM(1)