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RE: Script to overcome ORA-54 during DDL

David Kurtz

2004-06-25

Replies:
I've used something like this in the past, except I also exclusively lock
the table to which I am trying to apply the DDL.
The idea being that I wait to get the exclusive lock, and having got the
exclusive lock the DDL can acquire the lock in nowait mode. Its not
perfect, but I find I need less attempts to get the DDL to execute.

_________________________
David Kurtz
Go-Faster Consultancy Ltd.
tel: +44 (0)7771 760660
fax: +44 (0)7092 348865
mailto:david.kurtz@(protected)
web: www.go-faster.co.uk
PeopleSoft DBA Forum: http://groups.yahoo.com/group/psftdba


-----Original Message-----
From: oracle-l-bounce@(protected)
[mailto:oracle-l-bounce@(protected)
Sent: 25 June 2004 21:37
To: oracle-l@(protected)
Subject: Re: Script to overcome ORA-54 during DDL



This looks about right (except for the formatting);

create or replace procedure do_ddl(m_sql varchar2)
as
in_use exception ;
pragma exception_init(in_use, -54);
begin
while true loop
begin
 execute immediate m_sql;
 exit;
exception
 when in_use then null;
 when others then raise;
end;
dbms_lock.sleep(0.01);
end loop;
end;
/

Regards

Jonathan Lewis

http://www.jlcomp.demon.co.uk

http://www.jlcomp.demon.co.uk/faq/ind_faq.html
The Co-operative Oracle Users' FAQ

http://www.jlcomp.demon.co.uk/seminar.html
Optimising Oracle Seminar - schedule updated May 1st


----- Original Message -----
From: "Jeremiah Wilton" <jwilton@(protected)>
To: <oracle-l@(protected)>
Sent: Friday, June 25, 2004 7:55 PM
Subject: Script to overcome ORA-54 during DDL


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


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