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The previous code shows the simplest way of using System.Transactions. Simply surround the code that needs to be part of a transaction with a transaction scope. Notice that towards the end of the block, there is a call to the Complete method on the scope indicating that this piece of code executed its part successfully and it s okay to commit the transaction. If you want to abort the transaction, simply don t call Complete. The TransactionScope object will do the right thing by default. That is, if there was already a transaction active, then the scope will happen within that transaction; otherwise, it will start a new transaction. The pattern is fairly simple: The transaction scope will either pick up an already active transaction or will start a new one. It is very important to ensure the code calls the dispose() method when code execution is complete, so make sure that the transaction code is within a using block, or make sure to explicitly dispose of the object. There is no requirement to use the newer transaction models with SQLCLR code; the existing .NET Framework 1.x and explicit SQL Server transactions still exist. These transactions can be nested, in the sense that your stored procedure or function might be called within a transaction, and it would still be valid for you to call BeginTransaction. (Note that this does not mean you get true nested transactions; you ll get the same behavior that you d get when nesting BEGIN TRAN statements in T-SQL.) There is a difference between transactions started in T-SQL stored procedures and the ones started in SQLCLR code: SQLCLR code cannot unbalance the transaction state on entry/exit of a SQLCLR invocation. This brings up a couple of limitations:

Practice: Creating a Synonym. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 519

Diagnose causes of failures. Failure types include database failures, physical server failures, and SQL Server service failures.

Lesson Summary. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 519

You cannot start a transaction inside a SQLCLR frame and cannot commit it or roll it back; SQL Server will generate an error during frame exit. Similarly, you cannot commit or roll back an outer transaction inside SQLCLR code. Any attempt to commit a transaction that you didn t start in the same procedure will cause a run-time error.

Lesson Review . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 520

Any attempt to roll back a transaction that you didn t start in the same procedure will doom the transaction (preventing any other side-effect operation from occurring), but the transaction won t disappear until the SQLCLR code is unloaded. Transactions can be a very powerful tool in the arsenal of database developers, but you must take care to understand exactly how they work when integrating with CLR code.

Review. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 521

Lessons in this chapter:

Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 521

Another factor to weigh when deciding whether to use CLR objects is determining the memory utilization of CLR code. Sometimes a developer will choose to implement a CLR object only to realize that performance suffers due to excessive memory consumption. Unfortunately, there aren t any easy ways to determine how much memory a CLR object will consume before it is deployed, but every developer should make an effort to measure memory consumption of all CLR objects during the development cycle before they are placed into production. The easiest way to measure CLR memor y consumption is by quer ying the sys.dm_os_memory_clerks DMV, as shown in the following code: