如何使用“RAISE INFO,RAISE LOG,RAISE DEBUG”来跟踪PostgreSQL

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;

作为代码,我想通过使用RAISE将一些消息放入日志中,但位置在哪里
我的日志文件？和RAISE DEBUG输出的地方？