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. innochecksum supports files up to 2GB
innochecksum does not support tablespaces that contain compressed pages.
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:
innochecksum supports the following options. For options that refer to page numbers, the numbers are zero-based.