Script to overcome ORA-54 during DDL
- From: Jeremiah Wilton <jwilton@xxxxxxxxxxxxx>
- To: oracle-l@xxxxxxxxxxxxx
- Date: Fri, 25 Jun 2004 11:55:51 -0700 (PDT)
Sometimes when trying to perform DDL on really hot objects (heavy
read/DML), I get:
ORA-00054: resource busy and acquire with NOWAIT specified.
I guess this is because you need to obtain a library cache lock in
order to change the object definition. Since there is no enqueue
mechanism for this resource, you can't just 'lock table ... in
exclusive mode;' All that gives you is a DML lock.
One way to avoid this is to write a PL/SQL routine that uses DBMS_SQL
and spins trying to run the DDL, stopping only when it succeeds. This
seems to work most of the time.
Does anyone have a script for doing the above that they would like to
share?
Please don't tell me to just use dbms_redefinition. That is
unnecessarily complex when the above technique can be used instead.
Thanks
--
Jeremiah Wilton
http://www.speakeasy.net/~jwilton
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