[Description]
could not obtain lock on relation relation name. Lock relation. This will also accept any pending invalidation messages. If we got back InvalidOid, indicating not found, then there's nothing to lock, but we accept invalidation messages anyway, to flush any negative catcache entries that may be lingering.
[System Processing]
Processing will be aborted.
[Action]
To investigate the cause of the occurrence from the message, and remove cause.