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The Last Resource Commit optimization (sometimes referred to as Last Resource Gambit or Last Agent optimization) allows a single non-XA database to participate in a XA transaction by cleverly ordering the resources.

Info
titleMxaximum Maximum one non-XA resource

There can be at most one datasource emulating XA with Last Resource Commit participating in a transaction. If it happens that you're trying to use a second emulating datasource while one has already been used, BTM will throw an exception. Again, this is not a limitation of BTM but of the concept itself.

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