On Tue, Jul 10, 2018 at 03:04:05PM +0900, Michael Paquier wrote:
> It would be simple to measure the time it takes to replay this single
> DROP DATABASE record by putting two gettimeofday() calls or such things
> and then take the time difference. There are many methods that you
> could use here, and I suppose that with a shared buffer setting of a
> couple of GBs of shared buffers you would see a measurable difference
> with a dozen of tablespaces or so. You could also take a base backup
> after creating all the tablespaces, connect the standby and then drop
> the database on the primary to see the actual time it takes. Your patch
> looks logically correct to me because DropDatabaseBuffers is a
> *bottleneck* with large shared_buffers, and it would be nice to see
> numbers.
This was a couple of months ago, and nothing has happened since with the
patch waiting on author, so the patch is marked as returned with
feedback.
--
Michael