[PERFORM] which is more important? freq of checkpoints or the duration of them?

2008-03-03 Thread Douglas J Hunley
Subject about says it all. Should I be more concerned about checkpoints happening 'frequently' or lasting 'longer'? In other words, is it ok to checkpoint say, every 5 minutes, if it only last a second or three or better to have checkpoints every 10 minutes that last half a minute? Stupid

Re: [PERFORM] which is more important? freq of checkpoints or the duration of them?

2008-03-03 Thread Scott Marlowe
On Mon, Mar 3, 2008 at 8:25 AM, Douglas J Hunley [EMAIL PROTECTED] wrote: Subject about says it all. Should I be more concerned about checkpoints happening 'frequently' or lasting 'longer'? In other words, is it ok to checkpoint say, every 5 minutes, if it only last a second or three or

Re: [PERFORM] which is more important? freq of checkpoints or the duration of them?

2008-03-03 Thread Greg Smith
On Mon, 3 Mar 2008, Douglas J Hunley wrote: In other words, is it ok to checkpoint say, every 5 minutes, if it only last a second or three or better to have checkpoints every 10 minutes that last half a minute? When checkpoints do too much work at once they will block clients for a

Re: [PERFORM] which is more important? freq of checkpoints or the duration of them?

2008-03-03 Thread Greg Smith
On Mon, 3 Mar 2008, Chris Browne wrote: Now, if you have reasonable settings (I'm not sure how well its tuning is documented :-(), checkpoint flushes should be able to be short, however infrequent they may be. In effect, the oops, the database got blocked by checkpoint flushing issue should

Re: [PERFORM] which is more important? freq of checkpoints or the duration of them?

2008-03-03 Thread Chris Browne
[EMAIL PROTECTED] (Douglas J Hunley) writes: Subject about says it all. Should I be more concerned about checkpoints happening 'frequently' or lasting 'longer'? In other words, is it ok to checkpoint say, every 5 minutes, if it only last a second or three or better to have checkpoints every