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available version of a row, in case the row is locked by another transaction that updated or deleted the row but had not yet completed. Isn t this what snapshot isolation does No, not exactly. In the read committed snapshot case, SQL Server always reads the latest version of the row; it doesn t care when the transaction was started. This means that it does not return dirty rows but can still encounter nonrepeatable and phantom reads. In the read committed snapshot isolation level, shared locks are not acquired for read operations because row versions are used instead. So, if you already pay the price of generating row versions, why don t you just use the snapshot isolation level First, in this isolation level, SQL Server doesn t need to find a particular version of a row; it just needs to find the last committed version. Also, update conflicts don t occur in the read committed snapshot isolation level. This is because SQL Server hasn t guaranteed that it will only return data that appears the way it did when the transaction started, so SQL Server will not break any guarantee if it uses the new committed version of a row. In this isolation level, instead of getting the update conflict error, SQL Server will just block the connection until the other connection releases its locks, and then it will execute the update. Here is an example:

Practice: Setting Up Log Shipping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 361

Number of text, ntext, image, or large value type varchar(max), nvarchar(max), varbinary(max) pages read from the data cache

ALTER DATABASE <current_database> SET ALLOW_SNAPSHOT_ISOLATION ON; ALTER DATABASE <current_database> SET READ_COMMITTED_SNAPSHOT ON; -- Table including some example rows used in this example. CREATE TABLE Test.TestTran (Col1 INT NOT NULL, Col2 INT NOT NULL); INSERT Test.TestTran (Col1, Col2) VALUES (1, 1);

Lesson Summary. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 365

Lesson Review . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 365

8

Lesson 3: Designing Failover and Failback Strategies . . . . . . . . . . . . . . . . . . . . . . . . 367

When Transact-SQL statements retrieve data from LOB columns, some LOB retrieval operations might require traversing the LOB tree multiple times. This might cause SET STATISTICS IO to report higher-than-expected logical reads.

Log Shipping Failover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 368

System; System.Data; Microsoft.SqlServer.Server; System.Data.SqlTypes;

Log Shipping Failback . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 370

public class CLRStoredProc { [Microsoft.SqlServer.Server.SqlProcedure] public static void GetTomorrowsDate() { System.DateTime tomorrow = System.DateTime.Now; System.TimeSpan ts = new System.TimeSpan(1, 0, 0, 0); SqlContext.Pipe.Send(Convert.ToString(tomorrow.Add(ts))); } } 'VB Imports Imports Imports Imports

Practice: Log Shipping Failover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 372

The following example shows how many logical and physical reads SQL Server uses as it executes a query against the AdventureWorks database:

Lesson Summary. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 372

Public Class CLRStoredProc <Microsoft.SqlServer.Server.SqlProcedure> _ Public Shared Sub GetTomorrowsDate() Dim tomorrow As System.DateTime tomorrow = System.DateTime.Now() Dim ts As New System.TimeSpan(1, 0, 0, 0) SqlContext.Pipe.Send(Convert.ToString(tomorrow.Add(ts))) End Sub End Class

Remote procedure call (RPC)

Notice that the CLRStoredProc method uses the SqlContext object to send a command through the SQL pipe. The SQLContext object is used to provide access to the context of the caller while the managed code executes in the SQL Server. The SqlPipe is one of three objects available through the SqlContext. This represents the pipe in which results flow back to the client. You can execute any one of the following methods:

All health checks within a cluster use RPC. If the RPC service is unavailable or has been disabled, all health checks within a cluster fail. You must ensure that the RPC service is enabled and set to auto matically start on all nodes within a cluster.