> -- Forwarded message --
> From: Jaime Casanova
> To: psql performance list
> Date: Wed, 19 Aug 2009 19:25:11 -0500
> Subject: [PERFORMANCE] how to set wal_buffers
> Hi,
>
> Our fine manual says:
> """
> The amount of memory used in shared memory for WAL data. The default
> is 64
Hi,
Yes, I thought about putting the bit-flags in separate fields.
Unfortunately - I expect to have quite a lot of these and space is an issue
when you are dealing with billions of records in fact table, so I prefer to
pack them into one int8.
For users it's also much easier to write "where mt_fl
On Thu, Aug 20, 2009 at 7:32 PM, Scott Marlowe wrote:
> 2009/8/20 Slava Moudry :
>> Hi,
>> Yes, I thought about putting the bit-flags in separate fields.
>> Unfortunately - I expect to have quite a lot of these and space is an issue
>> when you are dealing with billions of records in fact table, s
Hi,
in a web app we have a query that we want to show in limited results
at a time, this one executes in 10 seconds if i use limit but executes
in 300ms if i remove it.
why is that happening? the query is using and index for avoiding the
sort so the nestloop should go only for the first 20 records
On 8/20/09 4:09 PM, "Kevin Kempter" wrote:
> Hi all;
>
>
> I have a simple query against two very large tables ( > 800million rows in
> theurl_hits_category_jt table and 9.2 million in the url_hits_klk1 table )
>
>
> I have indexes on the join columns and I've run an explain.
> also I've s
2009/8/20 Slava Moudry :
> Hi,
> Yes, I thought about putting the bit-flags in separate fields.
> Unfortunately - I expect to have quite a lot of these and space is an issue
> when you are dealing with billions of records in fact table, so I prefer to
> pack them into one int8.
For giggles I cre
Kevin Kempter wrote:
Hi all;
I have a simple query against two very large tables ( > 800million rows
in theurl_hits_category_jt table and 9.2 million in the url_hits_klk1
table )
I have indexes on the join columns and I've run an explain.
also I've set the default statistics to 250 for bot
On Fri, Aug 21, 2009 at 1:38 AM, Alvaro
Herrera wrote:
> Greg Stark wrote:
>
>> It would be nice to have a solution to that where you could create
>> lightweight temporary objects which belong to an "application session"
>> which can be picked up by a different database connection each go
>> around
Greg Stark wrote:
> It would be nice to have a solution to that where you could create
> lightweight temporary objects which belong to an "application session"
> which can be picked up by a different database connection each go
> around.
It would be useful:
CREATE SCHEMA session1234 UNLOGGED
C
On Thu, Aug 20, 2009 at 11:18 PM, Craig James wrote:
> Greg Stark wrote:
>>
>> What you want is a multi-column primary key where userid is part of
>> the key. You don't want to have a separate table for each user unless
>> each user has their own unique set of columns.
> Not always true.
...
> The
Hi all;
I have a simple query against two very large tables ( > 800million rows in
theurl_hits_category_jt table and 9.2 million in the url_hits_klk1 table )
I have indexes on the join columns and I've run an explain.
also I've set the default statistics to 250 for both join columns. I get a
v
Greg Stark wrote:
What you want is a multi-column primary key where userid is part of
the key. You don't want to have a separate table for each user unless
each user has their own unique set of columns.
Not always true.
When the user logs back in, a hidden part of the login process gets a tab
On Thu, Aug 20, 2009 at 9:16 PM, Craig James wrote:
> Fabio La Farcioli wrote:
>>
>> i am developing a web app for thousands users (1.000/2.000).
>>
>> Each user have a 2 table of work...I finally have 2.000 (users) x 2 tables
>> = 4.000 tables!
>>
>> Postgres support an elevate number of tables??
Fabio La Farcioli wrote:
i am developing a web app for thousands users (1.000/2.000).
Each user have a 2 table of work...I finally have 2.000 (users) x 2
tables = 4.000 tables!
Postgres support an elevate number of tables??
i have problem of performance ???
We have run databases with over 1
On Tue, Aug 18, 2009 at 6:34 PM, Scott Marlowe wrote:
> 2009/8/18 Slava Moudry :
>>> increase default stats target, analyze, try again.
>> This field has only 5 values. I had put values/frequencies in my first post.
>
> Sorry, kinda missed that. Anyway, there's no way for pg to know which
> operat
Scott Marlowe wrote:
On Wed, Aug 19, 2009 at 9:40 AM, Phoenix Kiula wrote:
On Wed, Aug 19, 2009 at 11:37 PM, Andy Colson wrote:
Phoenix: run top again, and hit the '1' key. It'll show you stats for
each
cpu. Is one pegged and the others idle?
top - 10:38:53 up 29 days, 5 min, 1 user, loa
2009/8/19 Kevin Kempter
>
> We do have an index on url_hits.time
>
> not sure why timestamps were not used, I was not here for the design phase.
>
What's type of time column? I don't like it casts it to double in explain.
If it is integer, may be you need to change
and time >= extract ('epoch'
Craig Ringer ha scritto:
On Thu, 2009-08-20 at 09:01 +0200, Fabio La Farcioli wrote:
Each user have a 2 table of work...I finally have 2.000 (users) x 2
tables = 4.000 tables!
Hmm, ok. Does each user really need two tables each? Why?
Does the set of tables for each user have a different stru
On Thu, 2009-08-20 at 09:01 +0200, Fabio La Farcioli wrote:
> Each user have a 2 table of work...I finally have 2.000 (users) x 2
> tables = 4.000 tables!
Hmm, ok. Does each user really need two tables each? Why?
Does the set of tables for each user have a different structure? Or are
you separa
Thursday, August 20, 2009, 9:01:30 AM you wrote:
> i am developing a web app for thousands users (1.000/2.000).
> Each user have a 2 table of work...I finally have 2.000 (users) x 2
> tables = 4.000 tables!
If all tables are created equal, I would rethink the design. Instead of
using 2 tables p
Hi to all,
i am developing a web app for thousands users (1.000/2.000).
Each user have a 2 table of work...I finally have 2.000 (users) x 2
tables = 4.000 tables!
Postgres support an elevate number of tables??
i have problem of performance ???
Thanks
Sorry for my english
--
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