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MAINFRAME - TIP OF THE DAY : Q. If there is a situation, where we need to code more than 255 steps in a JOB? A. We need to split jcl into two jcls , at the end of the first jcl check the condition code and initiate the second jcl.

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Reg:Performance of a DB2 query

 
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PostPosted: Fri Sep 15, 2006 4:07 pm    Post subject: Reg:Performance of a DB2 query Reply with quote

Can anyone explain how to analyse the performance of a DB2 query
using EXPLAIN (ENDEVOR tool).
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Vinod Reddy.
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ovreddy
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PostPosted: Sat Oct 07, 2006 4:30 pm    Post subject: Reply with quote

Hi,

EXPLAIN statement inserts a row into PLAN TABLE usually named as PLAN_TABLE. This table contains several columns used to estimate cost for executing a query.

After executing EXPLAIN. Use select statement on PLAN_TABLE to see the cost of execution.

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Reddy.
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PostPosted: Mon Oct 09, 2006 10:43 am    Post subject: Reply with quote

Good Information!!!



Thanks,
Krishna
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PostPosted: Wed Nov 15, 2006 12:43 pm    Post subject: Reply with quote

Reddy, Thanx for information , i know that the results will be put in a PLAN_TABLE.

When you select * from PLAN_TABLE depending on which column will u able to decide the query is ok.

One thing is depending on index usage.

Second there are two cost columns PROCMS and PROCSU.
Do you know the maximum possible values for the above two columns,so that we can able to tell the query is performing well.
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