Re: Logging affected rows

On Thu, Jan 17, 2013 at 9:18 AM, classical_89 <luongnx512@gmail.com> wrote:

When i run a query , i just only want to the affected rows are logged to log
file,What can i do ? .Is there a parameter in postgresql.conf to do that ?
.Thanks in advance

AFAIK, I don't think we can log only affected rows of the query. But you can log the EXPLAIN ANALYZE output of the query which includes affected rows using AUTO_EXPLAIN contrib module. 

Eg:-

postgres=# set auto_explain.log_analyze TO on;

SET

postgres=# load 'auto_explain';

LOAD

postgres=# select count(*) from cities ;

 count

-------

     2

(1 row)

In logs:

2012-12-06 03:27:57.104 IST [17410]: [78-1] db=postgres,user=postgres LOG:  statement: select count(*) from cities ;

2012-12-06 03:27:57.105 IST [17410]: [79-1] db=postgres,user=postgres LOG:  duration: 0.024 ms  plan:

        Query Text: select count(*) from cities ;

        Aggregate  (cost=1.02..1.03 rows=1 width=0) (actual time=0.015..0.015 rows=1 loops=1)

          Output: count(*)

          ->  Seq Scan on public.cities  (cost=0.00..1.02 rows=2 width=0) (actual time=0.009..0.010 rows=2 loops=1)

                Output: city, location