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You are here: manpages

\FBINNOCHECKSUM\FR

Section: MySQL Database System (1)
Updated: 06/02/2017
Index Return to Main Contents

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 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. As of MySQL 5.6.16, innochecksum supports files greater than 2GB in size. Previously, innochecksum only supported 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.

: * -c
Print a count of the number of pages in the file.

: * -d
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.

: * -v
Verbose mode; print a progress indicator every five seconds.

COPYRIGHT

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/.