Hannu Krosing <hannu@skype.net> writes:
> Ühel kenal päeval, K, 2006-08-23 kell 05:23, kirjutas Gregory Stark:
>> global xmin it just occurred to me to wonder: Does lazy vacuum need a
>> transaction at all?
> When I asked the same question, I was told that a lot of core
> functionality vacuum uses needs to be in transaction.
Locks for instance; you certainly need a lock on the table. In general
a whole lot of the backend functionality is bound up in the transaction
start/stop mechanisms, and quite a bit of rearchitecting would be needed
to do very much outside a transaction. Doesn't really seem worth it.
regards, tom lane