Oracle Object Growth Test

Periodic monitoring of the usage of the database is essential to ensure that the database is always adequately sized to handle current and future loads. It is also essential to monitor the size of the objects within a database too. If the growth of any object is uncontrollable, then other objects in the database may be deprived of space to store critical data. The Oracle Object Growth test helps administrators in figuring out the exact objects that have been growing beyond a pre-configured size. Using this test administrators can isolate the objects that have been growing uncontrollably and analyze if those objects need to be resized.

This test monitors the objects in the target Oracle Database server and reports the count of objects that have exceeded growing beyond a pre-configured size

This test is disabled by default. To enable the test, go to the enable / disable tests page using the menu sequence : Agents -> Tests -> Enable/Disable, pick Oracle Database as the Component type, Performance as the Test type, choose this test from the disabled tests list, and click on the << button to move the test to the ENABLED TESTS list. Finally, click the Update button.

Note:

This test will not report metrics for an Oracle 12c CDB server.

Target of the test : An Oracle server

Agent deploying the test : An internal agent

Outputs of the test : One set of results for every SID monitored.

Configurable parameters for the test
  1. TEST PERIOD - How often should the test be executed
  2. Host – The host for which the test is to be configured
  3. Port - The port on which the server is listening
  4. User – In order to monitor an Oracle database server, a special database user account has to be created in every Oracle database instance that requires monitoring. A Click here hyperlink is available in the test configuration page, using which a new oracle 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_catalog_role and create session privileges.

    The sample script we recommend for user creation (in Oracle database server versions before 12c) for eG monitoring is:

    create user oraeg identified by oraeg

    create role oratest;

    grant create session to oratest;

    grant select_catalog_role to oratest;

    grant oratest to oraeg;

    The sample script we recommend for user creation (in Oracle database server 12c) for eG monitoring is:

    alter session set container=<Oracle_service_name>;

    create user <user_name>identified by <user_password> container=current default tablespace <name_of_default_tablespace> temporary tablespace <name_of_temporary_tablespace>;

    Grant create session to <user_name>;                                

    Grant select_catalog_role to <user_name>;

    The name of this user has to be specified here.

  5. Password – Password of the specified database user

    This login information is required to query Oracle’s internal dynamic views, so as to fetch the current status / health of the various database components.

  6. Confirm password – Confirm the password by retyping it here.
  7. alternate view – In large environments, where the volume of transactions to the Oracle database server is generally very high, this test may take time to execute and retrieve the desired results. To ensure that the test is faster and is resource-efficient, administrators of such environments can create an alternate ‘view’ on the target Oracle database server, and grant select privileges to the view to the special database user mentioned above. Once the view is created, the test should be configured to use the alternate view for metrics collection; to achieve this, specify the name of the view in the alternate view text box. By default, this text box is set to none, which implies that the alternate view is not used by default.

    This alternate ‘view’ should be created with the following structure:

    CREATE OR REPLACE VIEW <VIEW_NAME> (
    TABLESPACE_NAME,
    FILE_ID,
    BLOCK_ID,
    BYTES,
    BLOCKS,
    RELATIVE_FNO
    ) AS
    select /*+ use_hash (tsfi, fet2) */ tsfi.tablespace_name,
           tsfi.file_id,
           fet2.block_id,
           tsfi.blocksize * fet2.blocks,
           fet2.blocks,
           tsfi.relfile#
    from   (select /*+ use_hash (ts, fi) */ ts.name tablespace_name,
                   fi.file# file_id,
                   ts.BLOCKSIZE,
                   fi.relfile#,
                   ts.ts#
            from   sys.ts$ ts,
                   sys.file$ fi
            where  ts.ts# = fi.ts#
            and    ts.online$ in (1,4)) Tsfi,
           (select f.block# block_id,
                   f.length blocks,
                   f.file# file_id,
                   f.ts#
            from   sys.fet$ f
            union all
            select f.ktfbfebno block_id,
                   f.ktfbfeblks blocks,
                   f.ktfbfefno,
                   ktfbfetsn
            from   sys.x$ktfbfe f) Fet2
    where  fet2.file_id = tsfi.relfile#
    and    fet2.ts# = tsfi.ts# ;

  8. OBJECT SIZE GB – Specify the size limit (in GB) for the objects against the OBJECT SIZE GB text box beyond which the objects are termed as large objects. The default value is set to none.
  9. ISPASSIVE – If the value chosen is yes, then the Oracle server under consideration is a passive server in an Oracle cluster. No alerts will be generated if the server is not running. Measures will be reported as “Not applicable'' by the agent if the server is not up.
Measurements made by the test
Measurement Description Measurement Unit Interpretation

Large objects

Indicates the total number of objects that have grown beyond the limit specified against the OBJECT GROWTH SIZE parameter.

Number

 

Max object growth size

Indicates the maximum size upto which the objects continued to grow during the last measurement period.

MB

The detailed diagnosis of this measure lists the objects that continued to grow and the size of the objects.

Max object growth

Indicates the maximum growth of an object in terms of percentage.

Percent

Use the detailed diagnosis to figure out the objects that recorded the maximum growth.