log only user queries in Postgres

Question

I've enabled logging in my Postgres database (running on Ubuntu 32 bits) and I'd like to log only queries that a re performed by user applications. I've configured postgres as follows:

log_destination = 'syslog'
syslog_facility = 'L*emphasized text*OCAL0'
syslog_ident = 'postgres'
log_min_messages = notice
log_min_duration_statement = 0
log_duration = off
log_line_prefix = 'user=%u,db=%d '
log_statement = 'none'

In syslog.conf I've configured for every log made to local0 be redirected to /var/log/pgsql.

However, Postgres is logging a lot of queries which I don't care for, for example:

WHEN typbasetype=0 THEN oid else typbasetype END AS
Sep 16 12:22:28 or-ubuntu postgres[14086]: [11-2]  basetype
Sep 16 12:22:28 or-ubuntu postgres[14086]: [11-3] ^I  FROM pg_type WHERE oid=1043
Sep 16 12:22:28 or-ubuntu postgres[14086]: [12-1] user=postgres,db=prueba LOG:  duración: 0.361 ms sentencia: SELECT format_type(oid,-1) as typname FROM pg_type WHERE oid = 2950
Sep 16 12:22:28 or-ubuntu postgres[14086]: [13-1] user=postgres,db=prueba LOG:  duración: 0.348 ms sentencia: SELECT CASE WHEN typbasetype=0 THEN oid else typbasetype END AS
Sep 16 12:22:28 or-ubuntu postgres[14086]: [13-2]  basetype
Sep 16 12:22:28 or-ubuntu postgres[14086]: [13-3] ^I  FROM pg_type WHERE oid=2950
Sep 16 12:22:28 or-ubuntu postgres[14086]: [14-1] user=postgres,db=prueba LOG:  duración: 0.451 ms sentencia: SELECT format_type(oid,104) as typname FROM pg_type WHERE oid =
Sep 16 12:22:28 or-ubuntu postgres[14086]: [14-2]  1043
Sep 16 12:22:28 or-ubuntu postgres[14086]: [15-1] user=postgres,db=prueba LOG:  duración: 0.353 ms sentencia: SELECT CASE WHEN typbasetype=0 THEN oid else typbasetype END AS
Sep 16 12:22:28 or-ubuntu postgres[14086]: [15-2]  basetype
Sep 16 12:22:28 or-ubuntu postgres[14086]: [15-3] ^I  FROM pg_type WHERE oid=1043

Is there any way to prevent these lines from being logged?

Thanks in advance

Diego

Answer 1

If your applications use their own roles (as they should) you can change the appropriate settings for those roles only with "ALTER ROLE":

ALTER ROLE <account> SET log_statement = 'all';

(or "log_min_duration_statement = 0" as is in your configuration).