Can we have simultaneous merges into LIVE?

Hi,
MergeWorkspace and RefreshWorkspace APIs freeze
the parent workspace in NO_ACCESS mode. Does this
mean that we can't perform simultaneous merges/refreshes,
even if the parent workspace is LIVE?
If the answer is 'yes', does it make sense for
automatically refreshed workspaces (for which locking
is enabled automatically and therefore there are no conflicts)?
Regards,
Karina Borges

Karina,
As of the 9iR2 release, you are correct in that the parent workspace is locked in exclusive mode for the duration of the operation. The locks are released when the operation commits. These are blocking locks - so, in effect, simulataneous operations get serialized.
However, for the release after 9iR2, we have relaxed the locks acquired for many operations. Unfortunately, even in this release, MergeWorkspace and RefreshWorkspace still get an exclusive lock on the parent workspace (because we have to account for some special situations such as rollbackToSP of the parent workspace after a merge). MergeTable & RefreshTable do get only a shared lock thus allowing parallel simulateneous merges/refreshes.
We are working on making MergeWspc & RefreshWspc also acquire shared locks for the subsequent release. As you suggested, for pessimistic locking modes (such as for continually refreshed workspaces), it is easier.
Regards,
- Ramesh.

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