In an attempt to throw the authorities off his trail, Christopher Browne <cbbrowne@acm.org> transmitted:
> It sure would be nice to be able to have a way to query the start
> time of the eldest transaction on the system.
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? Without "leaping into grand evil?"
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