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 tablespace.
Invoke innochecksum like this:
shell> innochecksum [options] file_nameinnochecksum supports the following options. For options that refer
to page numbers, the numbers are zero-based.
· -?, --help
Displays help and exits.
· -c, --count
Print a count of the number of pages in the file.
· -d, --debug
Debug mode; prints checksums for each page.
· -e num, --end-page=#
End at this page number.
· -i, --per-page-details
Print out per-page detail information.
· -I, --info
Synonym for --help.
· -l, --leaf
Examine leaf index pages.
· -m num, --merge=#
Leaf page count if merge given number of consecutive pages.
· -p num, --page-num=#
Check only this page number.
· -s num, --start-page
Start at this page number.
· -u, --skip-corrupt
Skip corrupt pages.
· -v, --verbose
Verbose mode; print a progress indicator every five seconds.
· -V, --version
Displays version information and exits.
Copyright 2007-2008 MySQL AB, 2008-2010 Sun Microsystems, Inc.,
2010-2015 MariaDB Foundation
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02110-1301 USA or see http://www.gnu.org/licenses/.
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Information about the project can be found at ⟨http://mariadb.org/⟩.
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⟨https://mariadb.com/kb/en/mariadb/reporting-bugs/⟩. This page was
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MariaDB 10.1 14/12/2015 INNOCHECKSUM(1)