Re: [PERFORM] Are bitmap index scans slow to start?

2013-03-08 Thread Carlo Stonebanks
Sorry this took so long to get back to you. Here is where we were: I said: << So, this query is not called often, but the fact is that if it takes over 30 seconds to load an item (because the audit report takes so long to prepare the bitmap index scan when passed new query parameters) then it sev

Re: [PERFORM] PostgreSQL 9.2.3 performance problem caused Exclusive locks

2013-03-08 Thread Emre Hasegeli
On Fri, 08 Mar 2013 20:39:45 +0200, AI Rumman wrote: Knowing your problem, I read the docs and found that : * * *Fix performance problems with autovacuum truncation in busy workloads (Jan Wieck)* *Truncation of empty pages at the end of a table requires exclusive lock, but autovacuum was c

Re: [PERFORM] Poor plan when joining against a union containing a join

2013-03-08 Thread David Leverton
On 7 March 2013 18:47, Tom Lane wrote: > Good idea, but no such luck in that form: it's still not going to try to > push the parameterization down into the sub-query. I think you'd have > to write out the query with the views expanded and manually put the > WHERE restrictions into the lowest join

[PERFORM] PostgreSQL 9.2.3 performance problem caused Exclusive locks

2013-03-08 Thread Emre Hasegeli
Hi, I upgraded our master database server from 9.2.2 to 9.2.3 on Monday. We have been experiencing performance problems since then. Yesterday, our application hit the connection limit 5 times. It causes approximately 15 seconds of downtime. The database server hit 50 load average, then everything

Re: [PERFORM] Anyone running Intel S3700 SSDs?

2013-03-08 Thread Yeb Havinga
On 2013-03-08 07:48, CSS wrote: http://www.anandtech.com/show/6433/intel-ssd-dc-s3700-200gb-review Of most interest to me was this: Anyone have any benchmarks to share? I tested the 800GB disk with diskchecker.pl and it was ok. No benchmarks to share yet, as I'm waiting for the disks to be