How to use "RAISE INFO, RAISE LOG， RAISE DEBUG” to track log in PostgreSQL function? - postgresql

Question

CREATE OR REPLACE FUNCTION mover(src text, dst text, cpquery text, conname text, ifbin boolean) returns void as
$$
DECLARE
cnt integer;
dlcnt integer;
del_count integer;
ret text;
BEGIN
SELECT pg_catalog.dblink_copy_open(conname, dst, ifbin) INTO ret ;
RAISE LOG 'dblink_open %',ret;
execute 'SELECT 1 as check FROM ' || src ||' limit 1' into cnt;
IF cnt=0 THEN
PERFORM pg_sleep(2);
END IF;
IF ifbin=true THEN
RAISE DEBUG 'Start to Copy data with binary';
execute 'COPY (' || cpquery || ' ) to function pg_catalog.dblink_copy_write with binary';
RAISE DEBUG 'Finish Copy data';
ELSE
RAISE DEBUG 'Start to Copy data without binary';
execute 'COPY (' || cpquery || ' ) to function pg_catalog.dblink_copy_write';
RAISE DEBUG 'Finish Copy data';
END IF;
execute 'DELETE FROM ' || src;
GET DIAGNOSTICS del_count=ROW_COUNT;
RAISE INFO 'DELETE % rows',del_count;
SELECT pg_catalog.dblink_copy_end() INTO ret;
RAISE LOG 'dblink_end %',ret;
END;
$$
language plpgsql;
As code, I want to put some message into log by using RAISE, but where is the location
of my log file ? and where RAISE DEBUG output?

Answer 1

They can either be output to the Postgres log, reported back to the client, or both. These are controlled by server-side settings, log_min_messages and client_min_messages.
See the following doc for more details:
http://www.postgresql.org/docs/current/static/plpgsql-errors-and-messages.html
http://www.postgresql.org/docs/current/static/runtime-config-logging.html
As #a_horse_with_no_name suggested: These parameters can also be set via the SET command from the client.
It can be set via the SQL: set client_min_messages to 'debug';