Db hangs when we create a type

Question

hi,
1. In db i have a type created with:
CREATE OR REPLACE TYPE type_parent AS OBJECT (
f_parent_name VARCHAR2 (100)
NOT FINAL;
2. There are many objects (type_child1, type_child2...) which extend this type
3. There is a Queue defined in the db with type: type_parent and its started
4. When i create a new type as:
CREATE OR REPLACE TYPE type_child under type_parent(
f_child_name VARCHAR2 (60),
The db hangs for indefinite time.
We tried stopping the queue still the same is the issue.
When we restart the db the new type is being created fine.
Any idea what could have gone wrong? any ideas / pointers would be appreciated.
regards,
ravi

Answer 1

Hi,
As you stated the DB hangs, AFAIK, try to stop the queuing the Parent type for while, since the type is inuse with respect to the Queue (with respect to Table which dependent on that). Until that Sessions which using the Queue is not Cleared it would would hang. Since there would be Enqueue created on the Object. So, when you restart the DB or instance the Enqueue will get cleared and new child type is created with out any Issue. That might be internally happening (I doubt it). Try to Check that
Further Reference : http://www.akadia.com/services/ora_advanced_queueing.html
- Pavan Kumar N