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* COMMIT takes long time for read only transaction
@ 2011-05-26 18:19 Mario Splivalo <mario.splivalo@megafon.hr>
2011-05-26 19:50 ` Re: COMMIT takes long time for read only transaction Kevin Grittner <Kevin.Grittner@wicourts.gov>
0 siblings, 1 reply; 2+ messages in thread
From: Mario Splivalo @ 2011-05-26 18:19 UTC (permalink / raw)
To: pgsql-admin
Hi, all.
Postgres 8.4.4, quite often I have situation like this:
011-05-26 18:25:38.842 CEST [16163] <ample@knjiz> [192.168.1.5(32431)]
SET LOG: duration: 0.029 ms statement: BEGIN; SET TRANSACTION
ISOLATION LEVEL READ COMMITTED
2011-05-26 18:25:38.843 CEST [16163] <ample@knjiz> [192.168.1.5(32431)]
SELECT LOG: duration: 0.259 ms statement: SELECT
2011-05-26 18:25:38.847 CEST [16163] <ample@knjiz> [192.168.1.5(32431)]
SELECT LOG: duration: 2.205 ms statement: SELECT
2011-05-26 18:25:38.850 CEST [16163] <ample@knjiz> [192.168.1.5(32431)]
SELECT LOG: duration: 0.185 ms statement: SELECT
2011-05-26 18:25:39.250 CEST [16163] <ample@knjiz> [192.168.1.5(32431)]
SELECT LOG: duration: 0.232 ms statement: SELECT
2011-05-26 18:25:39.252 CEST [16163] <ample@knjiz> [192.168.1.5(32431)]
SELECT LOG: duration: 0.289 ms statement: SELECT
2011-05-26 18:25:39.255 CEST [16163] <ample@knjiz> [192.168.1.5(32431)]
SELECT LOG: duration: 0.639 ms statement: SELECT
2011-05-26 18:25:39.257 CEST [16163] <ample@knjiz> [192.168.1.5(32431)]
SELECT LOG: duration: 0.135 ms statement: SELECT
2011-05-26 18:25:39.258 CEST [16163] <ample@knjiz> [192.168.1.5(32431)]
SELECT LOG: duration: 0.156 ms statement: SELECT
2011-05-26 18:25:51.624 CEST [16163] <ample@knjiz> [192.168.1.5(32431)]
COMMIT LOG: duration: 11159.202 ms statement: COMMIT
2011-05-26 18:26:05.788 CEST [16163] <ample@knjiz> [192.168.1.5(32431)]
COMMIT LOG: duration: 326.856 ms statement: COMMIT
This is a grep from a postgres log when I had logging of all statements
enabled. I did grep by the local pid (16163), and what I don't
understand is:
- why is first COMMIT taking 11 seconds, when there are only SELECTs in
the transaction? SELECTS don't call any user defined functions, just
plain reads from the tables.
- what is that second COMMIT? If I issue COMMIT without 'BEGIN'
shouldn't I get: "COMMIT WARNING: there is no transaction in progress"
Mario
^ permalink raw reply [nested|flat] 2+ messages in thread
* Re: COMMIT takes long time for read only transaction
2011-05-26 18:19 COMMIT takes long time for read only transaction Mario Splivalo <mario.splivalo@megafon.hr>
@ 2011-05-26 19:50 ` Kevin Grittner <Kevin.Grittner@wicourts.gov>
0 siblings, 0 replies; 2+ messages in thread
From: Kevin Grittner @ 2011-05-26 19:50 UTC (permalink / raw)
To: Mario Splivalo <mario.splivalo@megafon.hr>; pgsql-admin
Mario Splivalo <mario.splivalo@megafon.hr> wrote:
> 2011-05-26 18:25:51.624 CEST [16163] <ample@knjiz>
> [192.168.1.5(32431)]
> COMMIT LOG: duration: 11159.202 ms statement: COMMIT
> 2011-05-26 18:26:05.788 CEST [16163] <ample@knjiz>
> [192.168.1.5(32431)]
> COMMIT LOG: duration: 326.856 ms statement: COMMIT
>
> This is a grep from a postgres log when I had logging of all
> statements enabled. I did grep by the local pid (16163), and what
> I don't understand is:
> - why is first COMMIT taking 11 seconds, when there are only
> SELECTs in the transaction? SELECTS don't call any user defined
> functions, just plain reads from the tables.
> - what is that second COMMIT? If I issue COMMIT without 'BEGIN'
> shouldn't I get: "COMMIT WARNING: there is no transaction in
> progress"
Hard to say what's going on without knowing more about your logging
configuration. If you run this query and post the results it will
help clarify the situation:
http://wiki.postgresql.org/wiki/Server_Configuration
-Kevin
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2011-05-26 18:19 COMMIT takes long time for read only transaction Mario Splivalo <mario.splivalo@megafon.hr>
2011-05-26 19:50 ` Kevin Grittner <Kevin.Grittner@wicourts.gov>
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