Re: subtransactions and FETCH behaviour (was Re: [HACKERS] PREPARE and transactions)

2004-07-06 Thread Zeugswetter Andreas SB SD
> Well, the proposal of implementing it like holdable cursors means using > a Materialize node which, if I understand correctly, means taking the > whole result set and storing it on memory (or disk). Would it help to hold the lock for a record that is the current cursor position, iff this record

Re: subtransactions and FETCH behaviour (was Re: [HACKERS] PREPARE and transactions)

2004-07-05 Thread Alvaro Herrera
On Tue, Jul 06, 2004 at 08:45:52AM +1200, Oliver Jowett wrote: > Buffering *all* the ResultSet data client-side isn't an option -- > cursors are used specifically to handle resultsets that don't fit into > heap on the client side. And implementing a disk cache or similar a) > doesn't work if yo

Re: subtransactions and FETCH behaviour (was Re: [HACKERS] PREPARE and transactions)

2004-07-05 Thread Jeroen T. Vermeulen
On Tue, Jul 06, 2004 at 08:45:52AM +1200, Oliver Jowett wrote: > This is a non-starter for JDBC: it has no control over when an > application decides to access a ResultSet in a way that results in a > FETCH of new data. >From what you're telling me, I'm not sure I like JDBC! Why did they com

subtransactions and FETCH behaviour (was Re: [HACKERS] PREPARE and transactions)

2004-07-05 Thread Oliver Jowett
Jeroen T. Vermeulen wrote: That makes me wonder why people want to maintain transactionality w.r.t. nested transactions but not with "outer" ones. Odd! Yep. But then the FETCH should still occur before the transaction as far as I'm concerned. You fetch a batch (if it fails, you terminate) and *tr