Problems with TransactionScope and Oracle

Question

we have written a C# 3.5 client talking to an Oracle database (11g) using the ODP.NET.

This application has a batch process where a long running task is performed ma

Answer 1

I know this is an old question but I'll add to it since I've seen this quite a bit.

Are you using RAC? Have you worked with a DBA to see if you're experiencing locking/blocking. I've used System.Transactions with Oracle for years and the only time I've had similar issues is when we were using RAC and additional configuration needed to be done.

Here's what happens: You start a transaction and are opening connections during the transaction (which is fine). However, the oracle service is not configured for distributed transaction processing (it's a simple checkbox option on the service). So additional connections start spanning more than one instance in the RAC cluster, and the related transactions are unaware of each other causing the .net process to block itself.

It's a simple fix. The oracle service you are using just needs DTP enabled.