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 Originally Posted by indrajit2002
I am not clear with the point "a second maintenance job was started after index reorganization got complete". Could you please elaborate it please?
Indeed I can.
I understand indexes got rebuild then after a while indexes went back to invalid/unusable state, is that correct?
If that's correct the most likely scenario is that after index rebuild process completed a process doing either "alter table move..." or "split/add partition..." or "direct path sqlloader" or "..." was executed invalidating indexes one more time. Experience and Oracle documentation say there are just few causes for index invalidation.
On the other hand, if you can prove indexes go invalid spontaneously better to open a SR with Oracle 
Pablo (Paul) Berzukov
Author of Understanding Database Administration available at amazon and other bookstores.
Disclaimer: Advice is provided to the best of my knowledge but no implicit or explicit warranties are provided. Since the advisor explicitly encourages testing any and all suggestions on a test non-production environment advisor should not held liable or responsible for any actions taken based on the given advice.
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