Query execution times increase when reruns after 10 minutes

We strive to optimize the query (SELECT statement of the USERS table) below. On the first run time, 47ms and on the next run, it takes averagely about 5ms. If I run it again after 10 minutes, then same 47ms on average.

This means that I need to increase the size of the SGA to hold the query/blocks here for a long time. The USERS table is a small table containing about 500 lines. Here are the General settings. The machine is not used actively, because this is a dev database.

SGA_MAX_SIZE = 325 MB

SGA_TARGET = 325 MB

Query:

DECLARE
   v_id   number;
   v_user varchar2(100);
   v_password varchar2(1000);
   v_description varchar2(100);
   v_active char(1);
   v_update_time date;
   
   start_time   TIMESTAMP;
   end_time   TIMESTAMP;
BEGIN
   start_time := SYSTIMESTAMP;


   SELECT ID, name, password,description,active, update_time
     INTO v_id, v_user, v_password,v_description,v_active, v_update_time
     FROM USERS
    WHERE user_name = 'userName2';
   end_time := SYSTIMESTAMP;
DBMS_OUTPUT.PUT_LINE ( (EXTRACT (SECOND FROM end_time) - EXTRACT (SECOND FROM start_time)) * 1000);
END;
/

We use the Oracle 10 g R2 with Linux.

Oh sorry you have defined sga_target then it means that you use Automatic Shared Memory Management. If you use a 10.x database I guess.

The buffer cache works in FIFO basis. So when you run the same query after 10 minutes the data block is not available in the buffer cache, if oracle is physical i/o.

And as you mentioned that you are working on a DEV database is it possible that someone else is populating the buffer cache which may not be the case in the PROD?

There is no rule defining the size of the SGA. You will need to constantly work on it to keep your optimum performance. But at the same time, you also need to consider the available memory. You may not use all of them for yourself.

So the bottom line is based on the available memory and your condition of database, you can try to adjust the size of the SGA. But do it in a DEV box (which I suppose is not as close as a PROD box) cannot be successful.

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    I created an asynchronous BPEL process that calls a view that takes time to give all of the records; While the process is invoking this database adapter, my process ends abruptly with the following error after 5 minutes

    Exception occurred when the link was invoked. Exception occurred during invocation of the JCA binding: "JCA binding run operations reference 'CAMPAIGN_BATCH_COUPONS_VSelect' have to: DBReadInteractionSpec Execute Failed Exception." Name of the query: [CAMPAIGN_BATCH_COUPONS_VSelect], the descriptor name: [CAMPAIGN_BATCH_COUPONS_V.WcCampaignBatchCouponsV]. Caused by java.sql.SQLTimeoutException: ORA-01013: user has requested cancellation of the pending operation. See the first exception for the specific exception. This exception is considered as reproducible, probably due to a communication failure. Because the overall transaction is reversing the invoke should be retried in a new transaction, restart from the place of the last committed transaction. To be classified as not reproducible instead, add nonRetriableErrorCodes property to "1013" deployment descriptor (i.e. weblogic - RA.Xml). ". The called JCA adapter threw an exception of resource. Please review the error message above carefully to determine a resolution.

    It seems that my approach is expired. Can I do for her to not expire like that?


    Can someone help me on this please?

    Thanks in advance.

    Published by: user1165407 on Sep 6, 2011 16:19

    Try to increase the JTA timeout in Admin Console... keep this value according to your business needs...

    Take a look at this...

    http://sudhakarsoa.blogspot.com/2011/03/How-do-you-configure-transaction.html

  • If I press the button 2 times to run the query 2 times

    Hello..

    If I press the button 2 times to run query 2 times
    I want to limit this problem, than a run time enough.
    no need to rerun query when I press the button because it will make the erroneous data.

    Please give me a solution
    Maha

    Hello Maha

    did you use KEY-EXEQRY trigger and turn off the query button?

    SET_ITEM_PROPERTY('BLOCK1.) REPRINT ', ENABLED, PROPERTY_FALSE);

    Sorry not clear for me, but plu everything sounds good :)

    Kind regards

    Amatu Allah

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