Re: [PERFORM] Background writer underemphasized ...

2008-04-19 Thread Greg Smith
On Sat, 19 Apr 2008, James Mansion wrote: But isn't it the case that while using background writer might result in *slightly* more data to write (since data that is updated several times might actually be sent several times), the total amount of data in both cases is much the same? Really de

Re: [PERFORM] Oddly slow queries

2008-04-19 Thread Christopher Browne
Martha Stewart called it a Good Thing when [EMAIL PROTECTED] (Thomas Spreng) wrote: > On 16.04.2008, at 17:42, Chris Browne wrote: >> [EMAIL PROTECTED] (Thomas Spreng) writes: >>> On 16.04.2008, at 01:24, PFC wrote: > The queries in question (select's) occasionally take up to 5 mins >

Re: [PERFORM] Oddly slow queries

2008-04-19 Thread Scott Marlowe
On Wed, Apr 16, 2008 at 3:48 PM, Thomas Spreng <[EMAIL PROTECTED]> wrote: > > On 16.04.2008, at 17:42, Chris Browne wrote: > > > [EMAIL PROTECTED] (Thomas Spreng) writes: > > > > > On 16.04.2008, at 01:24, PFC wrote: > > > > > > > > > > > > > > > > The queries in question (select's) occasionally t

Re: [PERFORM] Exact index overhead

2008-04-19 Thread Scott Marlowe
On Thu, Apr 17, 2008 at 9:42 AM, Gunther Mayer <[EMAIL PROTECTED]> wrote: > Pavan Deolasee wrote: > > > 2. The existing block should have enough free space to accommodate the > > new version > > A less than 100 fillfactor may help you given your rate of updates. > > > > > I see, as soon as a new

Re: [PERFORM] Background writer underemphasized ...

2008-04-19 Thread James Mansion
Greg Smith wrote: Using the background writer more assures that the cache on the controller is going to be written to aggressively, so it may be somewhat filled already come checkpoint time. If you leave the writer off, when the checkpoint comes you're much more likely to have the full 2GB av

Re: [PERFORM] Background writer underemphasized ...

2008-04-19 Thread Greg Smith
On Thu, 17 Apr 2008, Marinos Yannikos wrote: Controller is http://www.infortrend.com/main/2_product/es_a08(12)f-g2422.asp with 2GB cache (writeback was enabled). Ah. Sometimes these fiber channel controllers can get a little weird (compared with more direct storage) when the cache gets comp