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Message Posted: Wed, 18 Aug 2004 @ 13:26:58 GMT

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Subj:   Different plans for the same SQL request
From:   Ole Dunweber


Several times I have experienced very different plans in PMON compared to plans in SQL Assistent. I have been told about "regular explain" and "runtime explain" giving 2 different views of the same basic plan. But in these cases, it just can't be the same basic plan.

Because the PMON plan is very bad - performing an awfull product join on a large base table, running for hours.

While the regular explain in SQL Assistent shows our desired star join to this large base table.

The runtime SQL contains an insert into a temporary table, but it does not make any "Explain-difference" whether I include this table or not into the request.

What is going on??

We are on V2R.

The large base table has PPI.

Best Regards,

Ole Dunweber

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