pmp-check-pt-table-checksum¶

pmp-check-pt-table-checksum - Alert when pt-table-checksum finds data differences on a replica.

SYNOPSIS¶

Usage: pmp-check-pt-table-checksum [OPTIONS]
Options:
  -c CRIT         Raise a critical error instead of a warning.
  --defaults-file FILE Only read mysql options from the given file.
                  Defaults to /etc/nagios/mysql.cnf if it exists.
  -H HOST         MySQL hostname.
  -l USER         MySQL username.
  -p PASS         MySQL password.
  -P PORT         MySQL port.
  -S SOCKET       MySQL socket file.
  -T TABLE        The checksum table; default percona.checksums
  -w WARN         Warning threshold; ignored.
  --help          Print help and exit.
  --version       Print version and exit.
Options must be given as --option value, not --option=value or -Ovalue.
Use perldoc to read embedded documentation with more details.

DESCRIPTION¶

This Nagios plugin examines whether MySQL replication has drifted out of sync with the master’s data, according to checks performed by the pt-table-checksum tool in Percona Toolkit. It uses the following query to determine whether the server’s data matches its master’s:

SELECT /\* MAGIC_checksum_diff_query \*/
CONCAT(
   COUNT(\*),
   ' chunks differ in ',
   COUNT(DISTINCT CONCAT(db, tbl)),
   ' tables, including ',
   MIN(CONCAT(db, '.', tbl)))
FROM CHECKSUM_TABLE
WHERE master_cnt <> this_cnt OR master_crc <> this_crc
   OR ISNULL(master_crc) <> ISNULL(this_crc)
HAVING COUNT(\*) > 0

The word CHECKSUM_TABLE is replaced by the value of the -T option. If the table specified by -T does not exist, unknown is raised.

Alerts are raised at a WARNING level by default, but specifying the -c option with any value will change this to CRITICAL instead.

This check should be backwards compatible with Maatkit’s mk-table-checksum tool as well.

PRIVILEGES¶

This plugin executes the following commands against MySQL:

SELECT against the specified table.

This plugin executes no UNIX commands that may need special privileges.

VERSION¶

Percona Monitoring Plugins pmp-check-pt-table-checksum 1.0.3

Navigation