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Check mysql-innodb-buffer-pool-instances

Overview

Checks the InnoDB buffer pool instance configuration in MySQL/MariaDB. Logic is taken from MySQLTuner script:mysql_innodb(), v1.9.8.

Hints:

Fact Sheet

Fact Value
Check Plugin Download https://github.com/Linuxfabrik/monitoring-plugins/tree/main/check-plugins/mysql-innodb-buffer-pool-instances
Check Interval Recommendation Once a day
Can be called without parameters Yes
Compiled for Windows No
Requirements User with no privileges, locked down to 127.0.0.1 - for example monitoring\@127.0.0.1. Usernames in MySQL/MariaDB are limited to 16 chars in specific versions.
3rd Party Python modules pymysql

Help

usage: mysql-innodb-buffer-pool-instances [-h] [-V] [--always-ok]
                                          [--defaults-file DEFAULTS_FILE]
                                          [--defaults-group DEFAULTS_GROUP]
                                          [--timeout TIMEOUT]

Checks the InnoDB buffer pool instance configuration in MySQL/MariaDB.

options:
  -h, --help            show this help message and exit
  -V, --version         show program's version number and exit
  --always-ok           Always returns OK.
  --defaults-file DEFAULTS_FILE
                        Specifies a cnf file to read parameters like user,
                        host and password from (instead of specifying them on
                        the command line), for example
                        `/var/spool/icinga2/.my.cnf`. Default:
                        /var/spool/icinga2/.my.cnf
  --defaults-group DEFAULTS_GROUP
                        Group/section to read from in the cnf file. Default:
                        client
  --timeout TIMEOUT     Network timeout in seconds. Default: 3 (seconds)

Usage Examples

./mysql-innodb-buffer-pool-instances --defaults-file=/var/spool/icinga2/.my.cnf

Output:

8 InnoDB buffer pool instances. innodb_buffer_pool_size <= 1G and innodb_buffer_pool_instances !=1 [WARNING]. Set innodb_buffer_pool_instances to 1.

States

  • WARN if innodb_buffer_pool_instances > 64.
  • WARN if innodb_buffer_pool_size > 1 GB and innodb_buffer_pool_instances \<> min(innodb_buffer_pool_size in GB, 64 GB).
  • WARN if innodb_buffer_pool_size \<= 1 GB and innodb_buffer_pool_instances \<> 1.

Perfdata / Metrics

Name Type Description
mysql_innodb_buffer_pool_instances Number If innodb_buffer_pool_size is set to more than 1GB, innodb_buffer_pool_instances divides the InnoDB buffer pool into this many instances.
mysql_innodb_buffer_pool_size Bytes InnoDB buffer pool size in bytes. The primary value to adjust on a database server with entirely/primarily InnoDB tables, can be set up to 80% of the total memory in these environments.

Credits, License