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07.01.2008 at 02:21PM PDT, ID: 23531736
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9.5

Sporadic DX Contention

Asked by Jeffreymarcum in Oracle 10.x, Oracle 9.x, PL / SQL

Tags:

We have a PL/SQL package that calls another package over a database link. The remote packaged procedure is an autonomous transaction that updates some tables and then calls another package back across another database link to the original Oracle instance. That package updates some other data and returns to the remote instance which commits the autonomous transaction and returns to the first package.

Sporadically, the original session then hangs and has to be killed. It's one of those situations where just killing it doesnt work; you have to also kill the Unix process as well.

The process works intermittently with seemingly no consistency as to where it ends up locking.  It comes back from the remote process where that DOES consistently work/commit its data - it's after the fact that we get the lock.

We've looked at the V$ tables and it doesn't appear that any row locking is occurring. The local process is not updating any of the data that the remote process (or it's local surrogate) is touching. The session that hangs shows an event "DX - Contention". I don't know whether or not that is significant, but it's consistent.

I'm not even positive that the problem is this convoluted distributed transaction and not something else. Anyone have any ideas?
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[+][-]07.01.2008 at 08:19PM PDT, ID: 21913185

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Zones: Oracle 10.x, Oracle 9.x, PL / SQL
Tags: Oracle 10g
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Solution Provided By: dvz
Participating Experts: 1
Solution Grade: A
 
 
[+][-]07.02.2008 at 07:10AM PDT, ID: 21916521

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[+][-]07.02.2008 at 07:18AM PDT, ID: 21916619

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