Re: Finding if old transactions are running...

[Christopher Browne <cbbrowne(at)acm(dot)org>]

I can see this function available in the backend:

   TransactionId GetOldestXmin(bool alldbs);

The cost is based on walking thru each backend process, which I guess
is obvious, as if there are 47 backends, that means 47 xids.
Presumably not _too_ expensive; certainly something that has to be run
every time a vacuum is requested.

Is there a way to expose this?
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