Hi
I'm using cross join lateral with a non-trivial function in
an attempt to limit calculation of that function, and am
wondering about some aspects of how lateral is currently
implemented.
NB these queries are generated by a certain ORM, and are
usually embedded in much more complex
Hi all!
- checkpoint_segments 1000
- checkpoint_completion_target 0.9
- wal_buffers 256MB
- shared_buffers 31 gb
- max_connections 500
I see that some of you are using wal_buffers = 256MB.
I was under the impression that Postgres will not benefit from higher value
than the segment size,
For me 12000 tps until now
24 core, 150 Gb ram
- 5 ssd raid 5
- Debian 7.8
- Postgres 9.3.5
...with Postgres parameters customized:
- checkpoint_segments 1000
- checkpoint_completion_target 0.9
- wal_buffers 256MB
- shared_buffers 31 gb
- max_connections 500
- effective_io_concurrency 15
Nico Sabbi nicola.sa...@poste.it wrote:
Queries get executed very very slowly, say 20 minutes.
I'd like to know if someone has already succeeded in running
postgres with 200-300M records with queries running much faster
than this.
If you go to the http://wcca.wicourts.gov/ web site, bring
On 02/12/2015 11:38 PM, Kevin Grittner wrote:
If you go to the http://wcca.wicourts.gov/ web site, bring up any
case, and click the Court Record Events button, it will search a
table with hundreds of millions of rows. The table is not
partitioned, but has several indexes on it which are useful
paulcc paulcc@gmail.com writes:
select count(alpha.id)
from alpha
cross join lateral some_function(alpha.id) as some_val
where alpha.test
Here the function is strict, and moreover its argument will never
be null - hence there should always be a non-null value
Hello,
I've been away from postgres for several years, so please forgive me if
I forgot nearly everything:-)
I've just inherited a database collecting environmental data. There's a
background process continually inserting records (not so often, to say
the truth) and a web interface to query
Nico Sabbi nicola.sa...@poste.it wrote:
Can you give any hint on the configuration and on the underlying
hardware?
Well, this particular web site has millions of hits per day
(running up to about 20 queries per hit) from thousands of
concurrent web users, while accepting logical replication
Tom Lane-2 wrote
paulcc lt;
paulcc.two@
gt; writes:
select count(alpha.id)
from alpha
cross join lateral some_function(alpha.id) as some_val
where alpha.test
Here the function is strict, and moreover its argument will never
be null - hence there should always be a
On Feb 12, 2015 9:17 PM, Tom Lane t...@sss.pgh.pa.us wrote:
The planner might produce such a result if there's an opportunity
to perform the sorting via an index on alpha (ie, the ORDER BY
matches some index). If it has to do an explicit sort it's gonna
do the join first.
(If you have such
I can't speak to the numbers postgresql can or cannot do but the numbers
above sound very very doable. If you can get a hold of *greg smith's
postgresql high performance*, I always liked his method of tuning buffers
and checkpoints using the background writer stats. All of which can help
with the
On Thu, Feb 12, 2015 at 7:38 PM, Kevin Grittner kgri...@ymail.com wrote:
Nico Sabbi nicola.sa...@poste.it wrote:
Queries get executed very very slowly, say 20 minutes.
I'd like to know if someone has already succeeded in running
postgres with 200-300M records with queries running much faster
On 13/02/15 00:20, Gudmundsson Martin (mg) wrote:
Hi all!
- checkpoint_segments 1000
- checkpoint_completion_target 0.9
- wal_buffers 256MB
- shared_buffers 31 gb
- max_connections 500
I see that some of you are using wal_buffers = 256MB.
I was under the impression that Postgres will not
On Wed, Dec 17, 2014 at 4:55 PM, Simon Riggs si...@2ndquadrant.com wrote:
On 12 December 2014 at 03:31, Simon Riggs si...@2ndquadrant.com wrote:
Also attached is a new parameter called enable_sortedpath which can be
used to turn on/off the sorted path generated by the planner.
Now with
1. O/S
Under O/S, don't forget to mention linux kernel version.
We saw a MASSIVE increase in TPS (I think it was a doubling? Don't have the
data to hand right now) on our multicore RHEL6 servers, when moving from a
stock RHEL6 kernel to an ELREPO 3.18 series kernel. That's what 10 years of
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