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cud any one tell how to use ST05 tx?

cud any one tell how to use ST05 tx for better peformance?

what is activate and decactivate trace in st05?

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4 Answers

  • author's profile photo Former Member
    Former Member
    Posted on Apr 10, 2008 at 05:18 AM

    Hi

    SQL Trace transaction ST05: The trace list has many lines that are not related to the SELECT statement in the ABAP program. This is because the execution of any ABAP program requires additional administrative SQL calls. To restrict the list output, use the filter introducing the trace list.

    The trace list contains different SQL statements simultaneously related to the one SELECT statement in the ABAP program. This is because the R/3 Database Interface - a sophisticated component of the R/3 Application Server - maps every Open SQL statement to one or a series of physical database calls and brings it to execution. This mapping, crucial to R/3s performance, depends on the particular call and database system. For example, the SELECT-ENDSELECT loop on a particular database table of the ABAP program would be mapped to a sequence PREPARE-OPEN-FETCH of physical calls in an Oracle environment.

    The WHERE clause in the trace list's SQL statement is different from the WHERE clause in the ABAP statement. This is because in an R/3 system, a client is a self-contained unit with separate master records and its own set of table data (in commercial, organizational, and technical terms). With ABAP, every Open SQL statement automatically executes within the correct client environment. For this reason, a condition with the actual client code is added to every WHERE clause if a client field is a component of the searched table.

    To see a statement's execution plan, just position the cursor on the PREPARE statement and choose Explain SQL. A detailed explanation of the execution plan depends on the database system in use.

    Starting the Trace:

    To analyze a trace file, do the following:

    ...

    Choose the menu path Test  Performance Trace in the ABAP Workbench or go to Transaction ST05. The initial screen of the test tool appears. In the lower part of the screen, the status of the Performance Trace is displayed. This provides you with information as to whether any of the

    Performance Traces are switched on and the users for which they are enabled. It also tells you which user has switched the trace on.

    Using the selection buttons provided, set which trace functions you wish to have switched on (SWL trace, enqueue trace, RFC trace, table buffer trace).

    If you want to switch on the trace under your user name, choose Trace on. If you want to pass on values for one or several filter criteria, choose Trace with Filter. Typical filter criteria are: the name of the user, transaction name, process name, and program name.

    Now run the program to be analyzed.

    Stopping the Trace:

    To deactivate the trace:

    ...

    Choose Test Performance Trace in the ABAP Workbench. The initial screen of the test tool appears. It contains a status line displaying the traces that are active, the users for whom they are active, and the user who activated them.

    Select the trace functions that you want to switch off.

    Choose Deactivate Trace. If you started the trace yourself, you can now switch it off immediately. If the performance trace was started by a different user, a confirmation prompt appears before deactivation-

    Analyzing a Sample trace data:

    PREPARE: Prepares the OPEN statement for use and determines the access method.

    OPEN: Opens the cursor and specifies the selection result by filling the selection fields with concrete values.

    FETCH: Moves the cursor through the dataset created by the

    OPEN operation. The array size displayed beside the fetch data means that the system can transfer a maximum package size of 392 records at one time into the buffered area.

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  • author's profile photo Former Member
    Former Member
    Posted on Apr 10, 2008 at 05:21 AM

    Hi,

    It is the SQL trace. It gives you log of the actions taken during the transaction flow, lijke databases fetched,the function modules called etc...

    for using it:

    first activate it in st05.

    then run the transaction.

    then de activate it in st05.

    then see the log.

    Regards,

    Renjith Michael.

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  • author's profile photo Former Member
    Former Member
    Posted on Apr 10, 2008 at 05:23 AM

    Hi,

    SQL trace...

    ->run this transaction before executing ur code

    ->activate sql trace

    ->execute ur code

    ->turn off ur sql trace.

    Now u will be able to see the logic flow of ur program and wat all tables were hit on the database server.....

    very help full for performance tunning and debugging

    Check the below link..

    http://help.sap.com/saphelp_nw04/helpdata/en/5a/ace273ca0211d194b500a0c94260a5/content.htm

    http://www.thespot4sap.com/Articles/SAPABAPPerformanceTuning_PerformanceAnalysisTools.asp

    https://www.sdn.sap.com/irj/sdn/wiki?path=/display/maxdb/sqlTrace(ST05)&

    Regards

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  • Posted on Apr 10, 2008 at 07:34 AM

    please see my blog,

    /people/siegfried.boes/blog/2007/09/05/the-sql-trace-st05-150-quick-and-easy

    It was explicitly written because of the reappearing questions in the forum.

    The most useful feature of the SQL Trace (see section 3) is still not mentioned in the other references.

    Siegfried

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