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The Queue Reader Agent, qrdrsvc.exe, is used only when the queued updating option for transactional or snapshot replication has been enabled. The Queue Reader Agent is responsible for transferring the queue on the subscriber to the publisher.

Each replication agent has numerous configuration parameters that affect the behav ior. The 12 most common options are combined together into a single unit called an agent profile. Some of the more common options that you can configure are as follows:

In general, operations that produce side effects, such as DML statements or transaction operations, are disallowed from user-defined functions, including table-valued functions. These operations might be desired, however. For example, one might wish to set a SAVEPOINT transaction, perform some operation, and roll back to the SAVEPOINT in case an error occurs.

Practice tests For details about all the practice test options available, see the How to Use the Practice Tests section in this book s Introduction.

Controls how frequently the agent checks for new transactions to replicate; default is 5 seconds Controls how long the agent waits for a query to complete; default is 1800 seconds

The description of results produced by a CLR-stored procedure through SqlPipe differs from that of a CLR TVF and is consistent with results in T-SQL. A TVF is strongly typed, and as part of the registration (CREATE FUNCTION) statement, it must statically define the type of its return value.

The replication engine has three different methods that you can use to replicate data: snapshot replication, transactional replication, and merge replication.

Snapshot replication takes the entire set of data and sends it during each cycle of the replication engine. This is a full copy of the data that is applied to the subscriber. Any transactions that occurred against the publisher are captured and sent to a subscriber only the next time the snapshot runs. Snapshot replication uses the Snapshot Agent and the Distribution Agent. When the snapshot is initiated, the Snapshot Agent extracts the schema and bulk copies the data out to the snapshot folder by using BCP, the bulk copy program.

Another factor when deciding whether to use CLR objects is determining how transactions will be handled. The Microsoft .NET Framework 2.0 (which SQL Server 2005 requires) introduced a new namespace called System.Transactions. System.Transactions greatly extends the transaction-management capability of the .NET Framework. One major enhancement that System.Transactions provides is the concept of a current transaction, which is available through System.Transaction.Current. To maintain consistency with the .NET Transaction Framework, CLR code operates in the same fashion. If a transaction was active at the point where SQLCLR code is entered, then the transaction will be surfaced to the SQLCLR API through the System.Transactions.Transaction class. Specifically, Transaction.Current will be non-null. In most cases, you don t need to access the transaction explicitly. For database connections, ADO.NET will check Transaction.Current automatically when the connection is opened and will enlist the connection in that transaction transparently unless developers specify otherwise. However, there are a few scenarios in which you might want to use the transaction object directly, such as when you want to abort the external transaction from within your stored procedure or function. In this case, you can simply call Transaction.Current.Rollback(). If you want to enlist a resource that doesn t do automatic enlistment, or for some reason wasn t enlisted during initialization, you might also use the transaction object directly. The following code demonstrates CLR code using explicit transactions through the System.Transactions namespace:

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Change Control Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 512

//C# namespace { using using using TK442AppendixCodeCSharp System.Data; System.Data.SqlClient; System.Transactions;

Deployment Rollback. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 513