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We have a fairly sizable installation of DB2 on AIX (all new versions) and a data mart with a fact table of around 150 million records. Not that big. Hundreds of supporting tables. I run retrieves each day to load some applications. In testing a new system, I have noted that if I run a query for CY, wait until finished, then run for PY1, etc. the data returns in about 5 minutes. But it I run CY and PY1 at same time - the retrieve time goes up about 200%. If I run against three different years (three different queries), the times go up another 300%. I think this is ridiculous. What this says is - I have a very expensive data mart that can only be queried by 1 person at a time. Can anyone explain to me what I am seeing (possibly) as my DBA's and architects just shrug their shoulders to me. I do not see the same degredation in the SQL Server databases I work with. So is this a setup issue? We have "appropriate" indexing, etc. on all the queries I am using. They have been analyzed at length by the people who are supposed to know this stuff.
20091111-EE-VQP-89 / EE_QW_2_20070628
