1

We have Oracle 11g in production. Application system is still under active development. It will be very handy to get SQL statements which cause any error.

Does Oracle provide a standard function to trace and log these statements and additional (debug) info?

7

While I'm not sure if it's the easiest way, you can use an after servererror on database trigger to log all errors to a table.

From Log all database errors to a table by Ferdous Nadvi:

drop trigger log_errors_trig;
drop table   log_errors_tab;

create table log_errors_tab (
 error     varchar2(30),
 timestamp date,
 username  varchar2(30),
        osuser    varchar2(30),
        machine   varchar2(64),
 process   varchar2(8),
 program   varchar2(48));

create or replace trigger log_errors_trig 
 after servererror on database
declare
 var_user     varchar2(30);
 var_osuser   varchar2(30);
 var_machine  varchar2(64);
 var_process  varchar2(8);
 var_program  varchar2(48);
begin
 select username, osuser, machine, process, program
 into   var_user, var_osuser, var_machine, var_process, var_program
 from   sys.v_$session
 where  audsid = userenv('sessionid');

 insert into log_errors_tab
   values(dbms_standard.server_error(1),sysdate,var_user,
          var_osuser,var_machine,var_process,var_program);
end;
/

See also Oracle System Event Triggers on PSOUG and the official documentation for system event triggers

  • I understand that this will only trace SQL calls made from PL/SQL but please let me know if this is not the case. – Colin 't Hart Apr 18 '13 at 9:34
1

To find failed queries. Use following plsql trigger to find queries.

CREATE TABLE QUERY_LOG (ID              NUMBER,ORA_ERR         VARCHAR2(10),EXE_DATE        DATE,QRY_LOG         NCLOB);

CREATE SEQUENCE QUERY_LOG_ID NOCACHE;

CREATE OR REPLACE TRIGGER Failed_To_Extend_Temp
AFTER SERVERERROR ON DATABASE
DECLARE
    l_sql_text ora_name_list_t;
    l_n        NUMBER;
    t1         NCLOB;
BEGIN
    --IF (is_servererror(942) ) THEN
    l_n := ora_sql_txt(l_sql_text );

    FOR I IN 1 .. l_n
    LOOP
        t1 := t1||l_sql_text(i);
    END LOOP;

    INSERT INTO QUERY_LOG (Id , Ora_Err , EXE_DATE , QRY_LOG)
    VALUES (QUERY_LOG_ID.Nextval, ora_server_error(1), Sysdate,t1 );
--END IF;
END;
/

See my YouTube video Oracle, Find Failed Queries

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