pmdaoracle(1): Oracle database PMDA

pmdaoracle — Oracle database PMDA

Description

pmdaoracle is a Performance Co-Pilot PMDA which extracts live performance data from a running Oracle database.

Installation

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

/etc/pcpdbi.conf
$PCP_PMDAS_DIR/oracle/oracle.conf
./oracle.conf

This file can contain overridden values (Perl code) for the settings listed at the start of pmdaoracle.pl, for example:

$username - username to connect to the database [default: 'SYSTEM']
$password - password to connect to the database [default: 'manager']
$host - host the database is running on [default: 'localhost']
$port - port the database is listening on [default: '1521']
$os_user - operating system username (PMDA will run with the corresponding user id) [default: oracle]
@sids - an array of $ORACLE_SID database identifiers [default: ('master')]

In order to test your local settings, a simple script is provided that will connect and disconnect from the database - verifying fundamental configuration is in place before continuing on. If the $PCP_PMDAS_DIR/oracle/connect.pl script cannot connect, do not proceed with installation of the PMDA as it will be unsuccessful. Correct your local settings first.

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

# cd $PCP_PMDAS_DIR/oracle
# ./Install

To uninstall, do the following as root:

# cd $PCP_PMDAS_DIR/oracle
# ./Remove

pmdaoracle 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.

Connection State

By default, pmdaoracle will aggressively attempt to maintain persistent connections to Oracle to ensure timely responses to its queries, and will automatically re-connect if a connection drops.

However, in certain circumstances this may be undesirable, so a manual pmStore(3) mechanism is provided to explicitly control disconnecting and reconnecting to an Oracle instance. This can be used, for example, to ensure that pmdaoracle is not connected at shutdown, to ensure a clean Oracle shutdown process.

The pmstore (1) command can be used to disconnect and reconnect. Using the individual instances of the oracle.control.connected metric, one can set the connection state to either up (1) or down (0). Additionally, pminfo(1) can report on the current status of Oracle connections.

# pminfo -f oracle.control.connected

oracle.control.connected
    inst [0 or "master"] value 1

# pmstore oracle.control.connected 0
oracle.control.connected inst [0 or "master"] old value=1 new value=0

Files

/etc/pcpdbi.conf: configuration file for all PCP database monitors
$PCP_PMDAS_DIR/oracle/oracle.conf: configuration file for pmdaoracle
$PCP_PMDAS_DIR/oracle/sample.conf: example configuration file for pmdaoracle using $LD_LIBRARY_PATH
$PCP_PMDAS_DIR/oracle/connect.pl: configuration test script for Oracle database connectivity
$PCP_PMDAS_DIR/oracle/Install: installation script for the pmdaoracle agent
$PCP_PMDAS_DIR/oracle/Remove: undo installation script for the pmdaoracle agent
$PCP_LOG_DIR/pmcd/oracle.log: default log file for error messages from pmdaoracle

PCP Environment

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).

Info

PCP Performance Co-Pilot

Manual	Command	Description