Tibero PGA Test

A PGA is a memory region that contains data and control information for a server process. It is nonshared memory created by Tibero Database when a server process is started. Access to the PGA is exclusive to the server process. There is one PGA for each server process. Background processes also allocate their own PGAs.

If the PGA runs out of memory, then critical server processes may not run. To avoid this, administrators can use the TibPgaTest test to keep an eye on the memory consumption by the PGA and be proactively alerted administrator if one/more server processes are draining memory from the PGA rapidly.

Target of the test : A Tibero Database server

Agent deploying the test :An internal agent

Outputs of the test : One set of results for each target database server being monitored.

Configurable parameters for the test
Parameter Description

Test Period

How often should the test be executed.

Host

The host for which the test is to be configured.

Port

The port to which the specified host listens. By default, the port number is 8629.

User and Password

In order to monitor a Tibero database server, a special database user account has to be created in every Tibero database instance that requires monitoring. A Click here hyperlink is available in the test configuration page, using which a new Tibero database user can be created. Alternatively, you can manually create the special database user. When doing so, ensure that this user is vested with the select any dictionary and create session privileges.

The sample script we recommend for user creation for eG monitoring is:

create user tibeg identified by tibeg default tablespace <users> temporary tablespace<temp>;

grant create session, select any dictionary tibeg;

The name of this user has to be specified in the User text box, and the password of this user has to be entered in the Password text box. This login information is required to query Tibero's internal dynamic views, so as to fetch the current status / health of the various database components.

Confirm Password

Confirm the Password by retyping it here.

Tibero SID

Specify the SID of the target Tibero database instance that is to be monitored in this text box.

Measurements made by the test
Measurement Description Measurement Unit Interpretation

Current size

Indicates the amount of PGA memory that is currently in use.

MB

Ideally, the value of this measure should be low. A steady rise in this value is a sign of excessive consumption of PGA memory by server processes.

PGA usage ratio

Indicates the percentage of PGA memory that is consumed by the server processes.

Percent

Ideally, the value of this measure should be low. If this value rapidly approaches 100%, it indicates that the PGA is about to run out of free memory.