MirrorX, > so when a transaction is still open from a while back (according to the > transactionID), no 'new dead' tuples can be marked as re-usable space for > new rows, right? by 'new dead' i mean that for example there is a > transaction running from 10.00am(with a specific transactionID). when i > delete rows at 11.00am these are the ones i am referring to. With the understanding that what we're actually checking is snapshots (which are not completely linear) and not timestamps, yes, that's a good simplification for what happens. > but, for these rows, the 'deleted' ones. does vacuum do anything at all at > that time? and if so, what is it? thx in advance No, it does nothing. What would it do? -- Josh Berkus PostgreSQL Experts Inc. http://pgexperts.com -- Sent via pgsql-performance mailing list (pgsql-performance@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance
