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dbms_metadata get_dependent_ddl tips

Oracle Database Tips by Donald BurlesonMay 15, 2016

Question: What does the get_dependent_ddl procedure do in dbms_metadata?  Can you show an example of using get_dependent_ddl?

Answer:  The get_dependent_ddl procedure is used to identify all table dependencies.

SQL> select DBMS_METADATA.GET_DEPENDENT_DDL('TRIGGER','EMP') c1 from dual;

 The get_dependent_ddl procedure is a great way of locating dependent objects.  Here is a query to display the DDL for all constraints for tables:

select
   dbms_metadata.get_dependent_ddl('REF_CONSTRAINT', table_name)
from
   user_tables
where exists
   (select 1
    from
       user_constraints
    where
       table_name = t.table_name
--    and
--       constraint_type = 'R'
);

This query will display all DDL for a table

set lines 2000 pages 0
ver off
echo off head off feed off
set newpage none
set trimspool on
set long 5000000
col output for a1000 word_wrapped

exec dbms_metadata.set_transform_param(dbms_metadata.session_transform,'SQLTERMINATOR',true);
exec dbms_metadata.set_transform_param(dbms_metadata.session_transform,'STORAGE',false);  

spool EMP.sql

select dbms_metadata.get_ddl('TABLE','EMP','SCOTT') output from dual;

select dbms_metadata.get_dependent_ddl('INDEX','EMP','SCOTT') output from dual;

select dbms_metadata.get_dependent_ddl('CONSTRAINT','EMP','SCOTT') output from dual;

select dbms_metadata.get_dependent_ddl('REF_CONSTRAINT','EMP','SCOTT') output from dual;

select dbms_metadata.get_dependent_ddl('TRIGGER','EMP','SCOTT') output from dual;

spool off

 


   
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Note: This Oracle documentation was created as a support and Oracle training reference for use by our DBA performance tuning consulting professionals.  Feel free to ask questions on our Oracle forum.

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