pmdamysql(1) — Linux manual page


PMDAMYSQL(1)             General Commands Manual            PMDAMYSQL(1)

NAME         top

       pmdamysql - MySQL and MariaDB database PMDA

DESCRIPTION         top

       pmdamysql is a Performance Co-Pilot PMDA which extracts live
       performance data from a running MySQL or MariaDB database.

INSTALLATION         top

       pmdamysql uses a configuration file from (in this order):

       •   /etc/pcpdbi.conf

       •   $PCP_PMDAS_DIR/mysql/mysql.conf

       This file can contain overridden values (Perl code) for the
       settings listed at the start of, namely:

       •   database name (see DBI(3) for details, default is

       •   database username (default is "dbmonitor")

       •   database password (default is "dbmonitor")

       •   login account (default is "pcp")

       On some versions of MariaDB (10+) the performance schema is
       disabled by default, and must be enabled for the PMDA to
       function.  This is achieved by adding the string
       "performance_schema" into the "[mysqld]" section of the MariaDB
       configuration file (either my.cnf or my.ini).  The "SHOW ENGINES"
       SQL statement shows support for the performance schema.

       Once these initial setup actions are complete, you can access the
       names and values for the mysql performance metrics by doing the
       following as root:

           # cd $PCP_PMDAS_DIR/mysql
           # ./Install

       To uninstall, the following must be done as root:

           # cd $PCP_PMDAS_DIR/mysql
           # ./Remove

       pmdamysql is launched by pmcd(1) and should never be executed
       directly. The Install and Remove scripts notify pmcd(1) when the
       agent is installed or removed.

Binary Status values in text         top

       Some of the status values are in the form of YES/NO or ON/OFF.

       Since these cannot be interpreted by tools like pmie(1), they
       have been duplicated with a _num extension and the values of 1
       (YES/ON) or 0 (NO/OFF).

       •   mysql.slave_status.slave_io_running

       •   mysql.slave_status.slave_io_running_num

FILES         top

           configuration file for all PCP database monitors

           configuration file for pmdamysql

           installation script for the pmdamysql agent

           undo installation script for the pmdamysql agent

           default log file for error messages from pmdamysql


       Environment variables with the prefix PCP_ are used to
       parameterize the file and directory names used by PCP. On each
       installation, the file /etc/pcp.conf contains the local values
       for these variables.  The $PCP_CONF variable may be used to
       specify an alternative configuration file, as described in

SEE ALSO         top

       PCPIntro(1), pmcd(1), pmdadbping(1), pmie(1) and DBI(3).

COLOPHON         top

       This page is part of the PCP (Performance Co-Pilot) project.
       Information about the project can be found at 
       ⟨⟩.  If you have a bug report for this manual
       page, send it to  This page was obtained from the
       project's upstream Git repository
       ⟨⟩ on 2023-12-22.
       (At that time, the date of the most recent commit that was found
       in the repository was 2023-12-16.)  If you discover any rendering
       problems in this HTML version of the page, or you believe there
       is a better or more up-to-date source for the page, or you have
       corrections or improvements to the information in this COLOPHON
       (which is not part of the original manual page), send a mail to

Performance Co-Pilot               PCP                      PMDAMYSQL(1)