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Oracle Enterprise Manager Configuration Guide
Release 9.0.2

Part Number A95410-01
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C
General Repository Guidelines

Repository Sizing

This section provides guidelines for determining storage requirements and disk space allocation for your Oracle Enterprise Manager repository.

Space requirements can vary greatly as a result of what Oracle Enterprise Manager tools you are licensed to use and the amount of data generated by the work you perform. In addition, the growth of the repository could vary slightly depending upon the database version in which the repository is created.

If you choose to create a new repository from a typical installation session and accept the default configuration for the repository, a new OEM_REPOSITORY tablespace will be created. The OEM_REPOSITORY tablespace contains repository objects for the Oracle Enterprise Manager Console and all separately licensable Packs regardless if you have installed or purchased licenses for them. In addition, depending on the database version in which the repository is created, the repository could initially allocate between 6 - 26 MB of hard disk space.

Depending on how you actually use Oracle Enterprise Manager products, the repository size may increase. To determine by how much your repository could grow, refer to the table below. To accommodate an increase in repository size, the default OEM_REPOSITORY tablespace is automatically configured to autoextend. For example, if you have created the default OEM_REPOSITORY tablespace which allocates 4 MB for using Capacity Planner for a single, small database, but you actually plan to use Capacity Planner on a more regular basis - for example, for three large databases - then you should expect the size of your repository to increase by approximately 16 MB. In such situations, the tablespace would autoextend automatically to accommodate the increase.

If you choose to create a new repository from a typical installation session and want to use an existing tablespace, follow these steps to determine how much disk space the repository will use:

  1. Review the "Product" column to find the products you are using.

  2. Identify those actions you perform with each product in the "If you..." column.

  3. Add the corresponding hard disk space requirements for those actions from the "Then allocate..." column. The total of these requirements is the expected size of your repository.

Product If you... Then allocate...

Oracle Enterprise Manager Console

  • use only the Console

  • save little (if anything) in job history

4 - 9 MB

Oracle Diagnostics Pack

  • collect less than 4 MB of Trace Data

  • use Capacity Planner for a single, small database over a few days

35 MB

  • collect between 4 - 20 MB of Trace Data ·

  • use Capacity Planner for a single, medium-sized database over several months

60 MB

  • collect between 20 - 60 MB of Trace Data ·

  • use Capacity Planner for up to three large databases over several months

120 MB

Oracle Tuning Pack

save less than:

  • 50 tuned SQL statements

  • 5 scoped tuning sessions

  • 10 tablespace jobs in job history

less than 15 MB

save between:

  • 50 - 150 tuned SQL statements

  • 5 - 15 scoped tuning sessions

  • 10 - 30 tablespace jobs in job history

15 - 45 MB

save more than:

  • 150 tuned SQL statements

  • 15 scoped tuning sessions

  • 30 tablespace jobs in job history

more than 90 MB

Oracle Change Management Pack

  • for a schema with approximately

    500 objects ·

    1 baseline, with 2 saved versions of baseline·

    1 saved comparison·

    1 change plan (propagate the schema)

20 MB

  • For a schema with approximately

    500 objects.

    2 baselines, with 2 saved versions of baseline·

    2 saved comparisons·

    5 change plans

40 MB

  • For a schema with approximately

    500 objects·

    5 baselines, with 2 saved versions of baseline·

    5 saved comparisons, with 2 versions each·

    10 change plans

100 MB

Oracle Management Pack for Oracle Applications

  • use Capacity Planner for a single, small database over a few days

4 MB

  • use Capacity Planner for a single, medium-sized database over several months

10 MB

  • use Capacity Planner for up to three large databases over several months

20 MB

Oracle Management Pack for SAP R/3

  • use Capacity Planner for a single, small database over a few days

4 MB

  • use Capacity Planner for a single, medium-sized database over several months

10 MB

  • use Capacity Planner for up to three large databases over several months

20 MB

Oracle Standard Management PackFoot 1

  • for a schema with approximately

    500 objects·

    1 baseline, with 2 saved versions of baseline·

    1 saved comparison

20 MB

  • for a schema with approximately

    500 objects·

    2 baselines, with 2 saved versions of baseline·

    2 saved comparisons

35 MB

  • for a schema with approximately

    500 objects·

    5 baselines, with 2 saved versions of baseline·

    5 saved comparisons, with 2 versions each

80 MB

1 While the other separately licensable Packs are available with Oracle9i Enterprise Edition, the Oracle Standard Management Pack is only available with Oracle9i standard edition.

For example, if you:

The total of all these space allocations (7 MB + 45 MB + 4 MB + 32 MB) is 88 MB. Thus, you should allocate approximately 88Mb for your repository.


Important:

This is only a guideline based upon default configuration of the Oracle Enterprise Manager environment; any custom configuration done may significantly affect repository sizing requirements. What applications you are actually using in the Console and the various Packs; how you have configured certain parameters, etc., all will affect how much disk space the repository will require. For instance, the default sampling frequency for Oracle Diagnostics Pack is five minutes. If you reduce the sampling frequency then you will need to allocate more disk space. How much you save in the job history will also affect the amount of space necessary for the repository. If you have large outputs of 40-50 MB and you save those in job history, then you should allocate an additional 40-50 MB of disk space.



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