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In addition to using the correct transaction isolation level, you can take several other steps to reduce locking and still get the correct results in your transactions. You can use table locking hints by applying the WITH(<locking_hint>) keyword after the table name in a DML statement. In this way, you can use a stricter transaction isolation level (such as serializable) or a leaner isolation level (such as read uncommitted) for a specific table in a transaction. There are several table locking hints available; the following are the most commonly used:

One instance of Microsoft SQL Server 2005 installed Enterprise, Standard, or Developer Edition. Two copies of the AdventureWorks database: AWTransactional and AWMerge.

The replication engine uses named accounts for security. Therefore, the service accounts that SQL Server and SQL Server Agent are running under must be either local or domain accounts. You can not use local system for the service account.

WITH (READUNCOMMITTED / READCOMMITTED / REPEATABLEREAD / SERIALIZABLE)

Replication is designed as a data distribution mechanism. At the most basic level, changes made to one database are distributed to one or more targets. The core repli cation engine is designed for flexible implementation, but the core architecture can be leveraged to provide availability for a database because a redundant copy of data is maintained in synchronization with a master copy. This lesson describes the various components that you can configure in replication, along with the core architecture available within the replication engine.

You can generate statistics for an estimated query plan before a query executes, or you can obtain actual execution plan statistics by executing the query. You should carry out all of the following practices:

After this lesson, you will be able to:

These hints specify an alternate isolation level to use for the specific table. Note that you cannot specify the snapshot isolation level as a table locking hint. WITH (NOLOCK) This hint is equal to specifying READUNCOMMITTED; use READUNCOMMITTED. WITH (HOLDLOCK) This hint is equal to specifying SERIALIZABLE, but use SERIALIZABLE. Hold lock sounds more like it should be translated to repeatable read; however, HOLDLOCK is translated to serializable because of the lack of row locks in SQL Server versions prior to 7.0. Because row locks were not available, HOLDLOCK could protect against phantom reads. Because of this backward-compatibility issue, HOLDLOCK is translated to serializable. WITH (READPAST) READPAST causes SQL Server to skip locked rows instead of waiting for the locks to be released. In SQL Server 2005, READPAST is also available for UPDATE and DELETE statements. READPAST is usually used to mimic a queuing mechanism. If this is what is needed, consider implementing a SQL Server 2005 Service Broker solution instead. Service Broker natively provides queues and is implemented using T-SQL. A great book about SQL Server 2005 Service Broker is The Rational Guide to SQL Server 2005 Service Broker by Roger Wolter (Rational Press, 2006). WITH (XLOCK) This hint is used in DML statements to cause SQL Server to acquire exclusive locks instead of shared locks. The exclusive locks acquired will be held for the remainder of the transaction.

An article is the basic building block of replication and defines the most granular level of data distribution. An article can be defined against a table, view, stored procedure, or function. The type of article that is most relevant for high availability is an article defined against a table. The article defines the set of data within the table that SQL Server replicates to one or more databases.

from managed to native code when running inside SQL Server because SQL Server needs to do additional maintenance on thread-specific settings when switching context between native code and back. Consequently, XPs can significantly outperform managed code running inside SQL Server for cases where there are frequent transitions between managed and native code.

A publication is the most granular level within a replication architecture. Publications are groupings of articles that define the replication set.

Practice 2: Analyze a query plan. Use Transact-SQL SET Statement options and the Profiler Showplan event classes to analyze a query plan. Practice 3: Obtain query plan statistics.

Replication is unique among the various high-availability technologies in that it has the capability to make only a portion of a database redundant. You can apply one or