Subpartition exchange and library cache lock wait time

Many waits for library cache locks are observed during a run in which many processes exchange subpartitions in one particular table. The application ensures that two sessions will not try to exchange the same subpartition at once. We understand that the waits for library cache locks are normal and expected.

The table in question contains 90,000+ subpartitions. The question has come up of whether the time that Oracle spends acquiring and releasing the library cache locks is in any way proportional to the number of subpartitions.

Thoughts?

Thanks,

Paul Baumgartel
UBS AG
IB Accounting Solutions
400 Atlantic Street
Stamford, CT 06904

203.719.4368

paul.baumgartel_at_ubs.com
www.ubs.com

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