On Mon, Aug 20, 2012 at 7:06 PM, Scott Marlowe scott.marl...@gmail.com wrote:
On Mon, Aug 20, 2012 at 6:59 PM, Scott Marlowe scott.marl...@gmail.com
wrote:
On Mon, Aug 20, 2012 at 6:10 PM, Tom Lane t...@sss.pgh.pa.us wrote:
Craig James cja...@emolecules.com writes:
I want to do this:
On Tue, Aug 21, 2012 at 1:41 AM, Scott Marlowe scott.marl...@gmail.com wrote:
On Mon, Aug 20, 2012 at 7:06 PM, Scott Marlowe scott.marl...@gmail.com
wrote:
On Mon, Aug 20, 2012 at 6:59 PM, Scott Marlowe scott.marl...@gmail.com
wrote:
On Mon, Aug 20, 2012 at 6:10 PM, Tom Lane
On Tue, Aug 21, 2012 at 2:45 AM, Scott Marlowe scott.marl...@gmail.com wrote:
sometimes I hate my laptops touchpad. Ran something similar in php
got similar performance. By comparison, running select 1 instead of
nextval() took ~0.160s to run.
you're mostly measuring client overhead i think:
On Mon, Aug 20, 2012 at 6:06 PM, Scott Marlowe scott.marl...@gmail.com wrote:
On Mon, Aug 20, 2012 at 6:59 PM, Scott Marlowe scott.marl...@gmail.com
wrote:
On Mon, Aug 20, 2012 at 6:10 PM, Tom Lane t...@sss.pgh.pa.us wrote:
Craig James cja...@emolecules.com writes:
I want to do this:
On Mon, Aug 20, 2012 at 5:10 PM, Tom Lane t...@sss.pgh.pa.us wrote:
Craig James cja...@emolecules.com writes:
I want to do this:
select setval('object_id_seq', nextval('object_id_seq') + 1000, false);
Now suppose two processes do this simultaneously. Maybe they're in
transactions,
On Tue, Aug 21, 2012 at 10:32 AM, Craig James cja...@emolecules.com wrote:
On Mon, Aug 20, 2012 at 5:10 PM, Tom Lane t...@sss.pgh.pa.us wrote:
Craig James cja...@emolecules.com writes:
I want to do this:
select setval('object_id_seq', nextval('object_id_seq') + 1000, false);
Now suppose
I have a PostgreSQL 9.1 cluster. Each node is serving around 1,000 queries per
second when we are at a 'steady state'.
What I'd like to know is the average query time. I'd like to see if query
performance is consistent, or if environmental changes, or code releases, are
causing it to drift,
* Rick Otten (rot...@manta.com) wrote:
It seems like we almost have everything we need to track this in the stats
tables, but not quite. I was hoping the folks on this list would have some
tips on how to get query performance trends over time out of each node in my
cluster.
I'm afraid the
On 8/21/2012 1:53 PM, Stephen Frost wrote:
* Rick Otten (rot...@manta.com) wrote:
It seems like we almost have everything we need to track this in the stats
tables, but not quite. I was hoping the folks on this list would have some
tips on how to get query performance trends over time out
On Tue, Aug 21, 2012 at 9:32 AM, Craig James cja...@emolecules.com wrote:
On Mon, Aug 20, 2012 at 5:10 PM, Tom Lane t...@sss.pgh.pa.us wrote:
Craig James cja...@emolecules.com writes:
I want to do this:
select setval('object_id_seq', nextval('object_id_seq') + 1000, false);
Now suppose
On Tue, Aug 21, 2012 at 2:03 PM, Scott Marlowe scott.marl...@gmail.com wrote:
On Tue, Aug 21, 2012 at 9:32 AM, Craig James cja...@emolecules.com wrote:
On Mon, Aug 20, 2012 at 5:10 PM, Tom Lane t...@sss.pgh.pa.us wrote:
Craig James cja...@emolecules.com writes:
I want to do this:
select
Karl,
* Karl Denninger (k...@denninger.net) wrote:
That looks EXTREMELY useful and I'm looking forward to checking it out
in 9.2; I have asked a similar question about profiling actual queries
in the past and basically it came down to turn on explain or run a
separate explain yourself since
On Tue, Aug 21, 2012 at 1:03 PM, Scott Marlowe scott.marl...@gmail.com wrote:
That seems unnecessarily complex. how about this:
create sequence s;
select array_agg (a.b) from (select nextval('s') as b from
generate_series(1,1000)) as a;
Then you just iterate that array for the ids you
On Tue, Aug 21, 2012 at 2:59 PM, Craig James cja...@emolecules.com wrote:
On Tue, Aug 21, 2012 at 1:03 PM, Scott Marlowe scott.marl...@gmail.com
wrote:
That seems unnecessarily complex. how about this:
create sequence s;
select array_agg (a.b) from (select nextval('s') as b from
On 21.8.2012 20:35, Rick Otten wrote:
I have a PostgreSQL 9.1 cluster. Each node is serving around 1,000
queries per second when we are at a ‘steady state’.
What I’d like to know is the average query time. I’d like to see if
query performance is consistent, or if environmental changes, or
On 21 August 2012 22:08, Tomas Vondra t...@fuzzy.cz wrote:
As others already mentioned, the improvements in pg_stat_statements by
Peter Geoghean in 9.2 is the first thing you should look into I guess.
Especially if you're looking for per-query stats.
If people would like to know about a better
Howdy. I'm curious what besides raw hardware speed determines the performance
of a Seq Scan that comes entirely out of shared buffers… I ran the following on
the client's server I'm profiling, which is otherwise idle:
EXPLAIN (ANALYZE ON, BUFFERS ON) SELECT * FROM notes;
Seq Scan on notes
Ugh, never mind. I ran ltrace and it's spending 99% of its time in
gettimeofday.
select count(*) from notes;
count
-
1926207
(1 row)
Time: 213.950 ms
explain analyze select count(*) from notes;
QUERY PLAN
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