Re: [GENERAL] Postgres 8.3 HOT and non-persistent xids

2007-12-20 Thread Mike C
Thank you both, this clears everything up for me. Cheers, Mike ---(end of broadcast)--- TIP 2: Don't 'kill -9' the postmaster

Re: [GENERAL] Postgres 8.3 HOT and non-persistent xids

2007-12-20 Thread Karsten Hilbert
On Thu, Dec 20, 2007 at 12:55:02AM -0500, Tom Lane wrote: > "Mike C" <[EMAIL PROTECTED]> writes: > > And for non-persistent transaction ids, the documentation says that > > this is for read-only transactions. What defines a read-only > > transaction for this purpose? > > A transaction that has no

Re: [GENERAL] Postgres 8.3 HOT and non-persistent xids

2007-12-19 Thread Tom Lane
[ Pavan already answered most of this, but ... ] "Mike C" <[EMAIL PROTECTED]> writes: > And for non-persistent transaction ids, the documentation says that > this is for read-only transactions. What defines a read-only > transaction for this purpose? A transaction that has not done anything that

Re: [GENERAL] Postgres 8.3 HOT and non-persistent xids

2007-12-19 Thread Pavan Deolasee
On Dec 20, 2007 3:44 AM, Mike C <[EMAIL PROTECTED]> wrote: > Hi, > > Can someone clarify HOT updates for me (and perhaps put more detail > into the docs?). Is this statement correct: the HOT technique is used > on *any* table so long as no indexed column is affected. > Its partially correct. HOT

[GENERAL] Postgres 8.3 HOT and non-persistent xids

2007-12-19 Thread Mike C
Hi, Can someone clarify HOT updates for me (and perhaps put more detail into the docs?). Is this statement correct: the HOT technique is used on *any* table so long as no indexed column is affected. create table T (A int, B int); create index TB on T (B); insert into T (A,B) Values (1,2); So if