Setting priority of order of DELETE -vs- INSERT commands in Oracle database

Hi,
I have an .NET application which has a DELETE command (e.g. Delele from MyTable where id = 1) immediately followed by an INSERT command (e.g. INSERT INTO MyTable (id, field1, field2) values (1, 'x', 'y').
We are not using transactions, so the commands are independent.
MyTable has a unique constraint on the id column.
On occasion, I am getting an error "ORA-00001 : unique constraint ... violated."
I speculate that the INSERT command is being processed by the database before the DELETE command.
Would you know if the priority of INSERT commands can be set higher to DELETE commands? How could I set this on my database (for testing purposes)?
Thanks!

One piece of the puzzle that I nelgected to mention...
This DELETE/INSERT scenario is happening in an ASP.NET application going through Oracle's .NET driver (ODP.NET).
The DELETE and INSERT are run with the autocommit feature of ODP.NET (I assume this translates into a separate transaction for each of these two statements).
We have the "connection pooling" enabled (for the ODP.NET). Maybe because of the connection pooling, might ODP.NET be reversing the order of the DELETE and UPDATE commands?
A problem I have is that I cannot see this problem occur on my server: the problem only occurs on the customer's server. He has reported several occurances of the problem.
Do you think the Oracle session tracing will be of help if I cannot reproduce the problem (on my machine)?
Thanks for you help so far!
(clarification: The DELETE is run and "auto-committed", the immediately, the INSERT is run and "auto-committed")
Edited by: user8267059 on Oct 15, 2008 6:00 AM

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    Mobile: +91 - 9912380544

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