Re: deadlock problem

If you want to pin down why the deadlock is occurring, Here's an approach that Stefane Faroult suggested to me a couple of years ago.

Connect as sys, and create a pair of DDL triggers that log the contents of x$kgllk and x$kglpn before and after truncate - then reconnect as the relevant user and try the truncate again.

A 4020 is likely to be due to a request for a pin (x$kglpn) in exclusive mode when 'something else' is already holding the pin in non-null mode. This may help you to track down what object is causing the problem, and where.

Regards

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

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

• Original Message ----- To: "Multiple recipients of list ORACLE-L" <ORACLE-L_at_fatcity.com> Sent: 10 March 2003 14:48

> I am trying to do a TRUNCATE TABLE My_Table but keep getting this
error;
>
> A self-deadlock among DDL and parse locks
> is detected. In most cases, this self-deadlock
> is handled internally.
> This should be reported to Oracle Support
> ONLY IF an error is signalled back to the
> user on a command-line or screen.
> The following information may aid in finding
> the problem.
> ORA-04020: deadlock detected while trying to lock object
DFARNSWORTH.REGION_ZIPS
>
> This is in my test environment and there should not be anything else
locking the table. Any ideas??
>
> Thanks,
>
> Dave
> --

-- 
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-- 
Author: Jonathan Lewis
  INET: jonathan_at_jlcomp.demon.co.uk

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