INNOCHECKSUM(1) MariaDB Database System INNOCHECKSUM(1)
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 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 mariadb-
dump 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.
• -?, --help
Displays help and exits.
• -a num, --allow-mismatches=#
Maximum checksum mismatch allowed before innochecksum terminates.
Defaults to 0, which terminates on the first mismatch.
• -c, --count
Print a count of the number of pages in the file.
• -e num, --end-page=#
End at this page number.
• -i, --per-page-details
Print out per-page detail information.
• -I, --info
Synonym for --help.
• -f, --leaf
Examine leaf index pages.
• -l fn, --log=fn
Log output to the specified filename, fn.
• -m num, --merge=#
Leaf page count if merge given number of consecutive pages.
• -n, --no-check
Ignore the checksum verification. Until MariaDB 10.6, must be used
with the --write option.
• -p num, --page-num=#
Check only this page number.
• -D name, --page-type-dump=name
Dump the page type info for each page in a tablespace.
• -S, --page-type-summary
Display a count of each page type in a tablespace.
• -s num, --start-page
Start at this page number.
• -u, --skip-corrupt
Skip corrupt pages.
• -C name, --strict-check=name
Specify the strict checksum algorithm. One of: crc32, innodb, none.
If not specified, validates against innodb, crc32 and none. Removed
in MariaDB 10.6.
• -w name, --write=name
Rewrite the checksum algorithm. One of crc32, innodb, none. An
exclusive lock is obtained during use. Use in conjunction with the
-no-check option to rewrite an invalid checksum. Removed in MariaDB
10.6.
• -v, --verbose
Verbose mode; print a progress indicator every five seconds.
• -V, --version
Displays version information and exits.
COPYRIGHT
Copyright 2007-2008 MySQL AB, 2008-2010 Sun Microsystems, Inc.,
2010-2023 MariaDB Foundation
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 02110-1335 USA or see
http://www.gnu.org/licenses/.
SEE ALSO
For more information, please refer to the MariaDB Knowledge Base,
available online at https://mariadb.com/kb/
AUTHOR
MariaDB Foundation (http://www.mariadb.org/).
MariaDB 10.11 15 May 2020 INNOCHECKSUM(1)
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