Re: [PERFORM] [OT] RAID controllers blocking one another?

2008-01-18 Thread Sean Davis
On Jan 18, 2008 2:14 PM, Greg Smith <[EMAIL PROTECTED]> wrote: > On Fri, 18 Jan 2008, Sean Davis wrote: > > > FYI, here are the specs on the server. > > http://www.thinkmate.com/System/8U_Dual_Xeon_i2SS40-8U_Storage_Server > > Now we're getting somewhere. I&

Re: [PERFORM] [OT] RAID controllers blocking one another?

2008-01-18 Thread Sean Davis
On Jan 17, 2008 6:23 PM, Greg Smith <[EMAIL PROTECTED]> wrote: > On Thu, 17 Jan 2008, Scott Marlowe wrote: > > > On Jan 17, 2008 2:17 PM, Sean Davis <[EMAIL PROTECTED]> wrote: > >> two3-ware cards, one 9640SE-24 and one 9640SE-16 > > Sounds like they'

[PERFORM] [OT] RAID controllers blocking one another?

2008-01-17 Thread Sean Davis
We have a machine that serves as a fileserver and a database server. Our server hosts a raid array of 40 disk drives, attached to two3-ware cards, one 9640SE-24 and one 9640SE-16. We have noticed that activity on one controller blocks access on the second controller, not only for disk-IO but also

Re: [PERFORM] Bytea poor performance

2005-10-15 Thread Sean Davis
On 10/15/05 10:00 AM, "NSO" <[EMAIL PROTECTED]> wrote: > Hello, > > How about some explain analyze output? > Explain analyse select * from files where nr > 1450 > > "Index Scan using pk on files (cost=0.00..3.67 rows=50 width=36) > (actual time=0.000..0.000 rows=50 loops=1)" I may not be under

Re: [PERFORM] Bytea poor performance

2005-10-15 Thread Sean Davis
On 10/15/05 9:20 AM, "NSO" <[EMAIL PROTECTED]> wrote: > Hello, > > I am trying to select form table with bytea field. And queries runs very > slow. > My table: > CREATE TABLE files (file bytea, nr serial NOT NULL) WITH OIDS; > > Query: > select * from files where nr > 1450 > > (I have total 150

Re: [PERFORM] Massive delete performance

2005-10-11 Thread Sean Davis
On 10/11/05 8:05 AM, "Andy" <[EMAIL PROTECTED]> wrote: >> Do you have foreign key relationships that must be followed for cascade >> delete? If so, make sure that you have indices on them. > Yes I have such things. Indexes are on these fields. >> To be onest this > delete is taking the longest ti

Re: [PERFORM] Massive delete performance

2005-10-11 Thread Sean Davis
On 10/11/05 3:47 AM, "Andy" <[EMAIL PROTECTED]> wrote: > Hi to all, > > I have the following problem: I have a client to which we send every night a > "dump" with a the database in which there are only their data's. It is a > stupid solution but I choose this solution because I couldn't find any

Re: [PERFORM] [SQL] OFFSET impact on Performance???

2005-02-02 Thread Sean Davis
On Jan 26, 2005, at 5:36 AM, Leeuw van der, Tim wrote: Hi, What you could do is create a table containing all the fields from your SELECT, plus a per-session unique ID. Then you can store the query results in there, and use SELECT with OFFSET / LIMIT on that table. The WHERE clause for this temp