On 2/26/17 11:46, Robert Haas wrote:
> I don't see
> a solution other than launching a separate worker for each database,
> which seems like it could be extremely expensive if there are many
> databases.

You don't have to start all these workers at once.  Starting one and not
starting the next one until the first one is finished should be fine.
It will have the same serial behavior that the patch is proposing anyway.

Peter Eisentraut              http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services

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