Re: [PERFORM] Disk Fills Up and fsck "Compresses" it

2007-05-16 Thread Mark Kirkwood
Jim C. Nasby wrote: No, it's part of FreeBSD's UFS. google FreeBSD softupdates and you should get plenty of info. As I said, it's probably not worth worrying about. On Wed, May 16, 2007 at 08:21:23AM -0700, Y Sidhu wrote: What do you mean by "softupdates?" Is that a parameter in what I am gues

Re: [PERFORM] [doc patch] a slight VACUUM / VACUUM FULL doc improvement proposal

2007-05-16 Thread Tom Lane
Michael Stone <[EMAIL PROTECTED]> writes: > On Wed, May 16, 2007 at 03:34:42PM -0400, Chris Browne wrote: >> If CLUSTER is faster than VACUUM FULL (and if it isn't, in all cases, >> it *frequently* is, and probably will be, nearly always, soon), then >> it's a faster workaround. > Cluster reorders

Re: [PERFORM] [doc patch] a slight VACUUM / VACUUM FULL doc improvement proposal

2007-05-16 Thread Alvaro Herrera
Michael Stone wrote: > On Wed, May 16, 2007 at 03:34:42PM -0400, Chris Browne wrote: > >[EMAIL PROTECTED] (Michael Stone) writes: > >>Unless, of course, you don't particularly care about the order of > >>the items in your table; you might end up wasting vastly more time > >>rewriting tables due to

Re: [PERFORM] [doc patch] a slight VACUUM / VACUUM FULL doc improvement proposal

2007-05-16 Thread Michael Stone
On Wed, May 16, 2007 at 03:34:42PM -0400, Chris Browne wrote: [EMAIL PROTECTED] (Michael Stone) writes: Unless, of course, you don't particularly care about the order of the items in your table; you might end up wasting vastly more time rewriting tables due to unnecessary clustering than for ful

Re: [PERFORM] [doc patch] a slight VACUUM / VACUUM FULL doc improvement proposal

2007-05-16 Thread Chris Browne
[EMAIL PROTECTED] (Michael Stone) writes: > On Wed, May 16, 2007 at 12:09:26PM -0400, Alvaro Herrera wrote: >>Maybe, but we should also mention that CLUSTER is a likely faster >>workaround. > > Unless, of course, you don't particularly care about the order of > the items in your table; you might en

Re: [PERFORM] [doc patch] a slight VACUUM / VACUUM FULL doc improvement proposal

2007-05-16 Thread Michael Stone
On Wed, May 16, 2007 at 12:09:26PM -0400, Alvaro Herrera wrote: Maybe, but we should also mention that CLUSTER is a likely faster workaround. Unless, of course, you don't particularly care about the order of the items in your table; you might end up wasting vastly more time rewriting tables d

Re: [PERFORM] [doc patch] a slight VACUUM / VACUUM FULL doc improvement proposal

2007-05-16 Thread Jim C. Nasby
On Wed, May 16, 2007 at 12:09:26PM -0400, Alvaro Herrera wrote: > Guillaume Cottenceau wrote: > > "Jim C. Nasby" writes: > > > > > On Wed, May 16, 2007 at 09:41:46AM +0200, Guillaume Cottenceau wrote: > > > > [...] > > > > > > Come on, I don't suggest to remove several bold warnings about > > >

Re: [PERFORM] [doc patch] a slight VACUUM / VACUUM FULL doc improvement proposal

2007-05-16 Thread Alvaro Herrera
Guillaume Cottenceau wrote: > "Jim C. Nasby" writes: > > > On Wed, May 16, 2007 at 09:41:46AM +0200, Guillaume Cottenceau wrote: > > [...] > > > > Come on, I don't suggest to remove several bold warnings about > > > it, the best one being "Therefore, frequently using VACUUM FULL > > > can have

Re: [PERFORM] [doc patch] a slight VACUUM / VACUUM FULL doc improvement proposal

2007-05-16 Thread Guillaume Cottenceau
"Jim C. Nasby" writes: > On Wed, May 16, 2007 at 09:41:46AM +0200, Guillaume Cottenceau wrote: [...] > > Come on, I don't suggest to remove several bold warnings about > > it, the best one being "Therefore, frequently using VACUUM FULL > > can have an extremely negative effect on the performanc

Re: [PERFORM] Disk Fills Up and fsck "Compresses" it

2007-05-16 Thread Jim C. Nasby
No, it's part of FreeBSD's UFS. google FreeBSD softupdates and you should get plenty of info. As I said, it's probably not worth worrying about. On Wed, May 16, 2007 at 08:21:23AM -0700, Y Sidhu wrote: > What do you mean by "softupdates?" Is that a parameter in what I am guessing > is the conf fi

Re: [PERFORM] [doc patch] a slight VACUUM / VACUUM FULL doc improvement proposal

2007-05-16 Thread Jim C. Nasby
On Wed, May 16, 2007 at 09:41:46AM +0200, Guillaume Cottenceau wrote: > Michael Stone writes: > > > On Tue, May 15, 2007 at 06:43:50PM +0200, Guillaume Cottenceau wrote: > > >patch - basically, I think the documentation under estimates (or > > >sometimes misses) the benefit of VACUUM FULL for sca

Re: [PERFORM] New performance documentation released

2007-05-16 Thread Luke Lonergan
Cool! Now we can point people to your faq instead of repeating the "dd" test instructions. Thanks for normalizing this out of the list :-) - Luke On 5/15/07 8:55 PM, "Greg Smith" <[EMAIL PROTECTED]> wrote: > I've been taking notes on what people ask about on this list, mixed that > up with wo

Re: [PERFORM] Disk Fills Up and fsck "Compresses" it

2007-05-16 Thread Y Sidhu
What do you mean by "softupdates?" Is that a parameter in what I am guessing is the conf file? Yudhvir On 5/15/07, Jim C. Nasby <[EMAIL PROTECTED]> wrote: I'm guessing you're seeing the affect of softupdates. With those enabled it can take some time before the space freed by a delete will act

Re: [PERFORM] [doc patch] a slight VACUUM / VACUUM FULL doc improvement proposal

2007-05-16 Thread Guillaume Cottenceau
Michael Stone writes: > On Tue, May 15, 2007 at 06:43:50PM +0200, Guillaume Cottenceau wrote: > >patch - basically, I think the documentation under estimates (or > >sometimes misses) the benefit of VACUUM FULL for scans, and the > >needs of VACUUM FULL if the routine VACUUM hasn't been done > >pr