Why Does My TransactionScope Automatically Escalate to MSDTC on Some Machines?

TransactionScope: Why MSDTC Escalation Happens on Some Machines

TransactionScope improves transaction performance in data access layers. However, a common problem is that MSDTC escalation occurs inconsistently across developer machines. This article explores the reasons and solutions.

Causes of MSDTC Escalation

MSDTC escalation happens when:

• Multiple durable resources (e.g., databases) lacking single-phase commit support are involved in a transaction.
• A transaction spans multiple application domains or processes, necessitating serialization.

Troubleshooting and Solutions

Investigation revealed a key difference: developers without escalation used SQL Server 2008, while those experiencing it used SQL Server 2005.

SQL Server 2005 vs. SQL Server 2008

SQL Server 2008:

• Generally supports multiple connections within a single TransactionScope, provided they aren't opened concurrently.
• However, nested connections or connections to disparate resources may still cause escalation.

SQL Server 2005:

• Does not support multiple connections within a TransactionScope. Any additional connection attempts trigger MSDTC escalation.

For SQL Server 2005, maintaining a single, globally-scoped open connection throughout the TransactionScope avoids escalation. However, this contradicts best practices of delayed connection opening and prompt closure.

Further Points to Consider:

• Even with SQL Server 2008, using a SqlTableAdapter and pre-opening its connection can prematurely terminate the transaction, leading to escalation.
• While a custom TransactionScope implementation using ADO.NET transaction objects can bypass escalation, it necessitates significant development effort.

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