Strange query duration

From: "Fernando Hevia" <fhevia(at)ip-tel(dot)com(dot)ar>
To: <pgsql-sql(at)postgresql(dot)org>
Subject: Strange query duration
Date: 2008-07-22 19:10:55
Message-ID: 024301c8ec2e$aae2cc20$8f01010a@iptel.com.ar
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Hi list,

I just enabled log duration in a 8.3.1 database and got puzzling
information.
I have a daemon shell-script run every 10 seconds the following:

psql -c "select f_tasador();"

The 'f_tasador' procedure is quite fast. As per log output I can see the
procedure completes its execution within one second. Nevertheless in the LOG
duration entry it shows a statement duration of over 36 secs.
¿What is going on? ¿Where come those 36 seconds from?

Regards,
Fernando

--- Postgres Log extract ---
2008-07-22 15:52:37 ART|postgres| LOG: statement: select f_tasador();
2008-07-22 15:52:37 ART|postgres| NOTICE: [3576450000] Billable account
found
2008-07-22 15:52:37 ART|postgres| NOTICE: [3576450000] Destination
3514601344 not billable
2008-07-22 15:52:37 ART|postgres| NOTICE: [3576450000] Destination
3514719096 not billable
2008-07-22 15:52:37 ART|postgres| NOTICE: [3576450000] Destination
3576421309 not billable
2008-07-22 15:52:37 ART|postgres| NOTICE: [3576450000] Destination
3514601344 not billable
2008-07-22 15:52:37 ART|postgres| NOTICE: [3576450000] Destination
3514601344 not billable
2008-07-22 15:52:37 ART|postgres| NOTICE: [3576450000] Destination
3514601344 not billable
2008-07-22 15:52:37 ART|postgres| NOTICE: [3576450002] No active billable
account found
2008-07-22 15:52:37 ART|postgres| NOTICE: [3576450008] Billable account
found
2008-07-22 15:52:37 ART|postgres| NOTICE: [3576450008] Destination
3514601344 not billable
2008-07-22 15:52:37 ART|postgres| NOTICE: [3576450008] Destination
3514601344 not billable
2008-07-22 15:52:37 ART|postgres| NOTICE: [3576450008] Destination
3514601344 not billable
2008-07-22 15:52:37 ART|postgres| NOTICE: [3576450008] Destination
3514601344 not billable
2008-07-22 15:52:37 ART|postgres| NOTICE: [3576450008] Destination
3514601344 not billable
2008-07-22 15:52:37 ART|postgres| NOTICE: [3576450008] Destination
3514601344 not billable
2008-07-22 15:52:37 ART|postgres| NOTICE: [3576450009] Billable account
found
2008-07-22 15:52:37 ART|postgres| NOTICE: [3576450009] Destination
3516009059 not billable
2008-07-22 15:52:37 ART|postgres| LOG: duration: 38.154 ms
2008-07-22 15:52:47 ART|postgres| LOG: statement: select f_tasador();
2008-07-22 15:52:47 ART|postgres| NOTICE: [3576450000] Billable account
found
2008-07-22 15:52:47 ART|postgres| NOTICE: [3576450000] Destination
3514601344 not billable
2008-07-22 15:52:47 ART|postgres| NOTICE: [3576450000] Destination
3514719096 not billable
2008-07-22 15:52:47 ART|postgres| NOTICE: [3576450000] Destination
3576421309 not billable
2008-07-22 15:52:47 ART|postgres| NOTICE: [3576450000] Destination
3514601344 not billable
2008-07-22 15:52:47 ART|postgres| NOTICE: [3576450000] Destination
3514601344 not billable
2008-07-22 15:52:47 ART|postgres| NOTICE: [3576450000] Destination
3514601344 not billable
2008-07-22 15:52:47 ART|postgres| NOTICE: [3576450002] No active billable
account found
2008-07-22 15:52:47 ART|postgres| NOTICE: [3576450008] Billable account
found
2008-07-22 15:52:47 ART|postgres| NOTICE: [3576450008] Destination
3514601344 not billable
2008-07-22 15:52:47 ART|postgres| NOTICE: [3576450008] Destination
3514601344 not billable
2008-07-22 15:52:47 ART|postgres| NOTICE: [3576450008] Destination
3514601344 not billable
2008-07-22 15:52:47 ART|postgres| NOTICE: [3576450008] Destination
3514601344 not billable
2008-07-22 15:52:47 ART|postgres| NOTICE: [3576450008] Destination
3514601344 not billable
2008-07-22 15:52:47 ART|postgres| NOTICE: [3576450008] Destination
3514601344 not billable
2008-07-22 15:52:47 ART|postgres| NOTICE: [3576450009] Billable account
found
2008-07-22 15:52:47 ART|postgres| NOTICE: [3576450009] Destination
3516009059 not billable
2008-07-22 15:52:47 ART|postgres| LOG: duration: 36.781 ms

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