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No, you cannot do this. By updating metadata without getting rid of old messages may result in 'incorrect' state for messages.
So, the best option is to shut off your publish app or adapter. Then let the messages be cleared out before applying the update.
The problem was i think that we used these parameters (for DB adapters) :
The effect of these parameters is to suppress file persistence which is "more secure" as database persistence is more reliable (cluster node)
But the main drawback is that the oaiexport/oaiimport method for upgrading production repository is no more safely usable as explained in the first message.
We will desactivate these parameters.