PMDAPOSTGRESQL(1)          General Commands Manual         PMDAPOSTGRESQL(1)

NAME         top

       pmdapostgresql - PostgreSQL database PMDA

DESCRIPTION         top

       pmdapostgresql is a Performance Co-Pilot PMDA which extracts live
       performance data from a running PostgreSQL database server.

       Many of the staticstics available from a PostgreSQL server may not be
       enabled by default.  Refer to the online documentation at 
       which describes each of the available parameters related to
       statistics collection and how to enable them.

INSTALLATION         top

       pmdapostgresql uses a configuration file from

       This file currently contains only one section [authentication] which
       specifies values for the following default settings:

       ·   host - hostname, [default: 'local']

       ·   port - port number, [default: '5432']

       ·   dbname - database name, [default: 'postgres']

       ·   username - username to run as and to connect to the database
           [default: 'postgres']

       ·   password - password to connect to the database [default:

       ·   osuser - operating system user the PMDA runs as [default: not

       The defaults (as above) will result in the PMDA running as the
       current user, using a UNIX domain socket connection to the PostgreSQL
       server on the localhost.  If osuser is not specified in the
       configuration file, the PMDA will run as the current user.  A host
       specification of "local" will use a UNIX domain socket, which uses
       peer authentication, see comments in the pg_hba.conf file.  In this
       case, the osuser setting should probably be set to postgres.

       It is generally not necessary to alter the default configuration file
       for monitoring the local PostgreSQL server instance with a default
       server configuration.  Note the port number is required even for a
       UNIX domain connection because it's used as the socket filename by
       the server.

       Once this is setup, you can access the names and values for the
       postgresql performance metrics by doing the following as root:

             # cd $PCP_PMDAS_DIR/postgresql
             # ./Install

       To uninstall, do the following as root:

             # cd $PCP_PMDAS_DIR/postgresql
             # ./Remove

       pmdapostgresql 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.

       pmdapostgresql will automatically attempt to reconnect to the
       PostgreSQL server if it's connection is lost - e.g. if the PostgreSQL
       service is restarted.


       pmdapostgresql has been tested and verified with PostgreSQL server
       version 10.2 and earlier.  Later versions will probably also work
       correctly because the PMDA probes the various performance tables on
       start-up to determine the column ordering.  It also tolerates missing
       or renamed tables and/or columns.

FILES         top

              configuration file for pmdapostgresql

           installation script for the pmdapostgresql agent

           undo installation script for the pmdapostgresql agent

           default log file for error messages from pmdapostgresql

       Note the usual/default value for $PCP_PMDAS_DIR is /var/lib/pcp/pmdas
       and the default for $PCP_LOG_DIR is /var/log/pcp but these settings
       are platform dependent.


       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).

SEE ALSO         top

       PCPIntro(1), PMCD(1) and 

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
       2019-07-28.  (At that time, the date of the most recent commit that
       was found in the repository was 2019-07-26.)  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                   PMDAPOSTGRESQL(1)