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HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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NAME | DESCRIPTION | INSTALLATION | Binary Status values in text | FILES | PCP ENVIRONMENT | SEE ALSO | COLOPHON |
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PMDAMYSQL(1) General Commands Manual PMDAMYSQL(1)
pmdamysql - MySQL and MariaDB database PMDA
pmdamysql is a Performance Co-Pilot PMDA which extracts live
performance data from a running MySQL or MariaDB database.
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 pmdamysql.pl, namely:
• database name (see DBI(3) for details, default is
"DBI:mysql:mysql")
• 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.
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).
Eg:
• mysql.slave_status.slave_io_running
• mysql.slave_status.slave_io_running_num
/etc/pcpdbi.conf
configuration file for all PCP database monitors
$PCP_PMDAS_DIR/mysql/mysql.conf
configuration file for pmdamysql
$PCP_PMDAS_DIR/mysql/Install
installation script for the pmdamysql agent
$PCP_PMDAS_DIR/mysql/Remove
undo installation script for the pmdamysql agent
$PCP_LOG_DIR/pmcd/mysql.log
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 pcp.conf(5).
PCPIntro(1), pmcd(1), pmdadbping(1), pmie(1) and DBI(3).
This page is part of the PCP (Performance Co-Pilot) project.
Information about the project can be found at
⟨http://www.pcp.io/⟩. If you have a bug report for this manual
page, send it to pcp@groups.io. This page was obtained from the
project's upstream Git repository
⟨https://github.com/performancecopilot/pcp.git⟩ on 2025-08-11.
(At that time, the date of the most recent commit that was found
in the repository was 2025-08-11.) 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
man-pages@man7.org
Performance Co-Pilot PCP PMDAMYSQL(1)
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HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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