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Improve performance of DB2 BLU SQL with the GROUP BY subquery
Our customer newly built the DWH system using DB2 BLU. But certain SQL's performance is extremely bad. Problem SQLs are with the GROUP BY subquery and the SET clause subselect. STSC says itâ€˜s a matter of architecture, not a problem and they offered a workaround how to rewrite SQLs, but it's too difficult for the customer to rewrite SQLs, besides, SQLs BI tool's created are not able to rewritten by the customer. The customer now stopped using column organized tables, and started converting to conventional row organized tables. Request: Improve the DB2 optimizer for the query with the GROUP BY sub query and the SET clause sub select for column organized tables.
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