Procedure documentationTable Sizes Locate this document in the navigation structure

 

In the Statistics user menu (SAP MaxDB/SAP liveCache technology) you can find, among other things, a display of statistics about table sizes and growth in the user menu Table Sizes.

The current table sizes are determined by a report and saved in a database table which forms the history of table sizes and table growth. You can view, among other things, the statistical data in the Table Sizes user menu.

Procedure

Determining Statistical Data

If necessary, you will have to determine the statistics data for the tables.

Procedure

You have the following options:

  • Schedule the action Update Table Statistics in the DBA planning calendar every week.

    The database must be in the ONLINE operational state at the time of executing the task. To schedule the action  Update Statistics Tables, proceed as described in  Scheduling an Action .

  • You can also update the table statistics once in the Database Assistant or liveCache Assistant.

    The database must be in the ONLINE operational state at the time of executing the task. In the user menu, choose   Statistics   Table Sizes  , then execute function Update table statistics to start the background job that updates the statistics.

Result

The system determines the table sizes and their growth. The system determines the index sizes. The runtime depends on the fill level of the database instance and the number of tables you are analyzing. The measurement data is logged in the following areas:

  • Table SDBCCMS

    The measurement data from the tables can be viewed in the Database Assistant/liveCache Assistant in the Table Sizes menu.

  • Spool/Screen

    The measurement data from the tables and their indexes can be either printed out or downloaded for other provider’s tools.

  • Table ADATABSIZE (only for the basis database of the SAP system)

    You can use the SQL Studio database tool to access the measurement data and the indexes in the ADATABSIZE table directly.

Displaying Table Size

Once the statistical data has been determined, you can display it as follows:

Procedure

Open the Database Assistant (transaction DB50) or the liveCache Assistant (transaction LC10). Choose   Statistics   Table Sizes  .

or

Open the DBA Cockpit (transaction DBACOCKPIT) and select   Space   Table Sizes  .

Result

You can choose from the following displays:

  • Tables with Greatest Growth

    You can set the comparison time period, comparison interval, and the number of tables displayed.

  • Largest Tables

    You can set the date and number of tables displayed.

  • Growth of a Table

    You can set the table name and the display period.

You can display all statistics as graphics. The following functions are available:

  • Delete Statistics Data

    You can delete statistics data manually by specifying a time period/date or automatically by specifying a time period (in weeks).

  • Update Table Statistics

    Note that table statistics information is saved only once a day. Any older daily statistics are overwritten.