Christian Robottom Reis wrote at 2004-7-16 10:27 -0300:

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The database itself uses a short-lived lock to generate oids.

Functionality which would be interesting if it were publically available to solve the aforementioned problem.

The functionality to get OIDs is there. It is the "new_oid" method of "Storages". You can abuse OIDs for "identifies". -- Dieter