SQL*Plus error logging – workaround for ROLLBACK issue

In my previous post SQL*Plus error logging – New feature release 11.1, as a NOTE I stated an issue that whenever ROLLBACK is issued in the session, the feature fails to log the errors.
Thanks to Jacek Gebal for his blog “Oracle Thoughts”. I was really impressed by the workaround.

Workaround is simple but tricky.

Three simple steps :
1. Rename table SPERRORLOG to a new table.
1. Create a view as “SPERRORLOG”
2. Create a procedure with autonomous transaction.
3. Create an INSTEAD OF trigger to call above procedure. Instead of insert on SPERRORLOG, rather insert into the new table.

SQL> ALTER TABLE sperrorlog RENAME TO sperrorlog_new;
Table altered.

SQL> CREATE VIEW sperrorlog AS SELECT * FROM sperrorlog_new;

View created.

SQL> CREATE OR REPLACE PROCEDURE p_sperrorlog(
2       username VARCHAR2, timestamp TIMESTAMP, script VARCHAR2,
3       identifier VARCHAR2, message VARCHAR2, statement VARCHAR2
4 ) IS
5    PRAGMA AUTONOMOUS_TRANSACTION;
6 BEGIN
7    INSERT INTO sperrorlog_new
8    VALUES (username, timestamp, script, identifier, message, statement);
9    COMMIT;
10 END;
11 /

Procedure created.

SQL> SHOW ERRORS;
No errors.

SQL> CREATE OR REPLACE TRIGGER r_sperrorlog
2       INSTEAD OF INSERT ON sperrorlog FOR EACH ROW
3    CALL p_sperrorlog(
4       :NEW.username,:NEW.timestamp, :NEW.script,
5       :NEW.identifier, :NEW.message, :NEW.statement)
6 /

Trigger created.

SQL> SHOW ERRORS;
No errors.

Let’s test it and see.

SQL> show errorlogging;
errorlogging is OFF

SQL> set errorlogging on;

SQL> show errorlogging;
errorlogging is ON TABLE SPERRORLOG

SQL> insert into emp(empno) values ('abcd');
insert into emp(empno) values ('abcd')
*
ERROR at line 1:
ORA-01722: invalid number

SQL> select timestamp, script, message from sperrorlog;

TIMESTAMP
---------------------------------------------------------------------------
SCRIPT

--------------------------------------------------------------------------------

MESSAGE
--------------------------------------------------------------------------------

03-MAY-14 06.38.42.000000 AM

ORA-01722: invalid number

SQL> ROLLBACK;

Rollback complete.

SQL> select timestamp, script, message from sperrorlog;

TIMESTAMP
---------------------------------------------------------------------------
SCRIPT

--------------------------------------------------------------------------------

MESSAGE
--------------------------------------------------------------------------------

03-MAY-14 06.38.42.000000 AM

ORA-01722: invalid number

It works! Now we could capture the errors even if ROLLBACK is issued.

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