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HOW TO CHECK SIZE OF A CLIENT Note 118823 - CC-ADMIN: Size of a client

SAP NOTE 118823 - CC-ADMIN: Size of a client

Symptom

To be able to schedule client copies and also for system planning, the size of clients or tables in a client is required.

Reason and Prerequisites

In productive environments some tables can become very large. This is important both for performance planning and for system planning.

Solution

For local client copies or remote copies you can carry out a tablespace analysis in the log after a test run. This analysis estimates the memory space required. For the latest information refer to Note 35415.

Depending on the release, typical Customizing clients have the following sizes:
           3.0: approx. 150 - 200 MB
3.1: approx. 200 - 250 MB
4.0: approx. 350 - 400 MB
4.5: approx. 450 - 500 MB
4.6: approx. 150 - 1500 MB *
     * depending on the components of mySAP.com applied

Production clients with application data can of course be considerably larger.

The following reports shall help you to estimate the memory requirements of a client. However, you must know that there is no 'optimal' memory requirement for a client on the database. Each tool uses its own estimation that occasionally leads to very different results (for more information, refer to point 3 of Note 35415). In any case it is recommended that you also use the tools of the database or of Transaction DB02 to be able to evaluate the estimations.

You also need to consider that for client copies into an already existing client, you can only partly calculate the memory requirements of the new client with the existing size of the client (for more information refer to point 2 of Note 70643).

The reports have a problem in principle with tables that are not stored transparently, but as POOL or CLUSTER tables. This data is heavily compressed, and the results of the reports are clearly too high as a result. The tables in question are mostly found in areas of the database that have corresponding names, such as PSAPCLUD or PSAPPOOLD and so on. Examples are: POOL table ATAB, CLUSTER tables RFBLG and AABLG.

For information about the table category, go to the ABAP dictionary (Transaction SE11). As of Release WebAS 6.20, the table category of the respective table is specified in the output list of RSTABLESIZE. You can use this to sort and filter the data accordingly.

As of Release WebAS 6.20, reports RSSPACECHECK and RSTABLESIZE give you the option of replacing the CLUSTER tables with the CLUSTER. This takes the compression into account. (This is in accordance with the behavior of the client copy. Therefore, as of Release 4.6, you should carry out a client copy test run in another client in the system to analyze the system resources, instead of using report YKSPACEC. You would then have the option of carrying out an analysis of the areas of the database in the log display (Transaction SCC3)).

  • You can decide the size of individual tables in a client with the enclosed report YSTABSIZ as of Release 4.0. For Release 3.x, there is the equivalent program ZSTABSIZ. As from Basis Release 6.10, you can use report RSTABLESIZE as delivered.

           Both the table name and the client can be entered generically. Thus, you can determine the distribution of a client with the table name '*' and the distribution of one table to different clients by entering the table name and the client '*'.

           Furthermore, it is possible to exclude tables of delivery classes 'L' and 'A' from the selection.

           The report delivers the number of the entries in table, the table width and the memory requirement in bytes. In this case, the memory requirement is the result of the maximum row width and the number of rows. The value might differ considerably from the needed memory requirements if the table entries are on average considerably smaller than the maximum width. Also, the results might be affected if a compression is used.

  • To calculate the memory requirement in a subdivided manner by database areas, use the attached program YKSPACEC. As of Basis Release 6.10, you can use report RSSPACECHECK as delivered. However, these reports run only on databases with database areas (INFORMIX, ORACLE, ADABAS and DB2/CS), i.e. not with DB2/400.

           For ORACLE and INFORMIX, please make sure that you have implemented advance correction 228745 from Note 35415.

           The report delivers the memory requirement of the tables in the database areas affected and the free space in the database areas in KByte. Depending on the database used, this is a more or less exact estimation of the memory actually used in the respective database areas.  

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