Re: [PERFORM] Possible causes of sometimes slow single-row UPDATE with trivial indexed condition?

2009-09-19 Thread Vlad Romascanu
e: [PERFORM] Possible causes of sometimes slow single-row UPDATE with trivial indexed condition? Vlad Romascanu wrote: Problem occurs when running (in production) Postgres 8.3.7 64-bit (from RPM) on Ubuntu 8.04.2, on an Amazon EC2 (xen) "Large" instance (8GB RAM), with the DB on a 50GB

Re: [PERFORM] Possible causes of sometimes slow single-row UPDATE with trivial indexed condition?

2009-09-17 Thread Andy Colson
Vlad Romascanu wrote: Problem occurs when running (in production) Postgres 8.3.7 64-bit (from RPM) on Ubuntu 8.04.2, on an Amazon EC2 (xen) "Large" instance (8GB RAM), with the DB on a 50GB EC2 block device. Problem does not occur when running (in staging/pre-production) Postgres 8.3.5 32-bit (

Re: [PERFORM] Possible causes of sometimes slow single-row UPDATE with trivial indexed condition?

2009-09-17 Thread Richard Huxton
Vlad Romascanu wrote: > Problem occurs when running (in production) Postgres 8.3.7 64-bit (from > RPM) on Ubuntu 8.04.2, on an Amazon EC2 (xen) "Large" instance (8GB > RAM), with the DB on a 50GB EC2 block device. Hmm - don't know what the characteristics of running PG on EC2 are. This might be so

[PERFORM] Possible causes of sometimes slow single-row UPDATE with trivial indexed condition?

2009-09-16 Thread Vlad Romascanu
Problem occurs when running (in production) Postgres 8.3.7 64-bit (from RPM) on Ubuntu 8.04.2, on an Amazon EC2 (xen) "Large" instance (8GB RAM), with the DB on a 50GB EC2 block device. Problem does not occur when running (in staging/pre-production) Postgres 8.3.5 32-bit (from RPM) on Ubuntu 8.0