Hi,
We have a query which is taking a long time as compared to time taken last
month......
this query does a select on view1..this view1 is based on join oof 2 views
view2 and view3..
view2 is based on join of 6 tables while view3 is based on 9 tables..with
each table have significant number or rows
about 200000.......it is now taking about 150 sec to execute while it used
to take 45 sec......
--we r using COST based optimizer.........
-- i rebuild all the indexes on tables involved......
-- i make of copy of production machine on test machine with export/import
so no fragmentation on test machine still takin 120 sec on test machine as
well......
-- schema is analyzed with compute clause........
--indexes r properly build.....explain plan showing it is using all the
indexes properly and doing nested loop..........
-- SGA is propely sized w.r.t to RAM.................
What else to check for this performance degradation...........
i am only working on test machine so no other user intervention.........
Thanks
-Harvinder
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Author: Harvinder Singh
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