Debug DDL trigger

From: Herring Dave - dherri <Dave.Herring_at_acxiom.com>
Date: Mon, 22 Aug 2005 16:29:19 -0500
Message-ID: <7ED53A68952D3B4C9540B4EFA5C76E36CB875F@CWYMSX04.Corp.Acxiom.net>

Folks,  

I'm having a rough time trying to figure out how to debug a DDL trigger. I'm on Oracle 9.2.0.4, under Tru64 5.1. I've written a trigger whose purpose is to make a backup copy of a table in one schema into another, before the table gets dropped. The problem is, as far as I can tell, the trigger is never fired. I've validated that the trigger exists and is enabled, but can't get any further. Is there a way to trace how triggers get chosen to be fired by Oracle?  

Here's the trigger's text:  

CREATE OR REPLACE TRIGGER sys.cp_tab_before_drop_btg

   BEFORE drop ON dherri.SCHEMA

      WHEN ( ora_dict_obj_type = 'TABLE'

            AND ( ora_dict_obj_name LIKE 'SCORE\_ACCT\_TB\_%' ESCAPE '\'

                )

           )

DECLARE    PRAGMA AUTONOMOUS_TRANSACTION;    v_datestamp DATE := sysdate;

   v_ddl_stmt VARCHAR2(4000);

   v_ora_error NUMBER;

   v_procedure_name VARCHAR2(30) := 'CP_TAB_BEFORE_DROP_BTG';

   v_procedure_owner VARCHAR2(30) := 'SYS';

   v_table_count PLS_INTEGER := 1;  

BEGIN    INSERT INTO dherri.aud_plsql_error_tb values ('SYS','Test: Before SELECT',1,sysdate);

   COMMIT;   /*

• Validate the table to be dropped does exist.

 */

   SELECT COUNT(*) INTO v_table_count

     FROM dba_tables

    WHERE owner = ora_dict_obj_owner

      AND table_name = ora_dict_obj_name;  

   IF v_table_count > 0 THEN

      INSERT INTO dherri.aud_plsql_error_tb values ('SYS','Test: Within IF-TEST',v_table_count,sysdate);

      COMMIT;         v_ddl_stmt := 'CREATE TABLE dherri.'||ora_dict_obj_name||'_bkp PCTFREE 0 AS SELECT * FROM dherri.'||ora_dict_obj_name||';';

      EXECUTE IMMEDIATE v_ddl_stmt;

   END IF;   EXCEPTION    WHEN OTHERS THEN       v_ora_error := ABS(SQLCODE);

      INSERT INTO dherri.aud_plsql_error_tb VALUES (v_procedure_owner, v_procedure_name, v_ora_error, sysdate);

END; /  

Dave

---

Dave Herring, DBA

Acxiom Corporation

3333 Finley

Downers Grove, IL 60515

wk: 630.944.4762

<mailto:dherri_at_acxiom.com <mailto:dherri_at_acxiom.com> >

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Received on Mon Aug 22 2005 - 16:31:55 CDT