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Which values are now returned, the values that existed before or after the update Did this SELECT statement return dirty reads Did the first SELECT statement in Connection 1 return dirty reads 11. Close the three query windows for Connection 1, 2, and 3. Open a new query window, and execute the following SQL statement to clean up after this exercise:

To successfully master the exam objectives presented in this chapter, complete the following tasks.

The practice tests on this book s companion CD offer many options. For example, you can test yourself on just one exam objective, or you can test yourself on all the 70-443 certification exam content. You can set up the test so that it closely simulates the expe rience of taking a certification exam, or you can set it up in study mode so that you can look at the correct answers and explanations after you answer each question.

USE master; DROP DATABASE TestDB;

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

11

1. Which isolation level or levels protect against phantom rows 2. Which isolation level or levels do not acquire shared locks 3. Where are old versions of rows in snapshot isolation stored 4. Which is the default isolation level

You can use several tools to identify poorly performing queries. The ability to choose the appropriate tool for a particular problem is developed through experience and practice. You should carry out both of the following practices:

The primary purpose of replication is to distribute data from a master database to one or more secondary databases. Because replication maintains a duplicate copy of data in synchronization with the master copy, the technology can be leveraged to provide availability for applications. This chapter provides a basic overview of the replication engine, along with the vari ety of options that you can use to distribute data. It also explains how you can leverage the data distribution mechanisms to provide an extremely low latency availability solution that has the capability to also minimize downtime in the event a failback is necessary.

Exam objectives in this chapter:

Quick Check Answers 1. The serializable and snapshot isolation levels protect against phantom rows. 2. Snapshot, read committed snapshot, and the read uncommitted isolation level do not acquire shared locks. 3. Old versions of rows in snapshot isolation are stored in the tempdb system database. 4. The read committed isolation level is the default isolation level.

Specify an appropriate replication solution. Choose servers for peer-to-peer replication. Establish a strategy for resolving data conflicts. Design an application failover strategy. Design a strategy to reconnect client applications. Specify the publications and articles to be published. Specify the distributor of the publication. Specify the subscriber of the publication.

You used these tools in the previous chapter. This chapter describes the specific ways the tools can be used to identify poorly performing queries.

6

11

Lessons in this chapter:

Always try to design a solution that minimizes both the amount of resources locked in a transaction and the risk of blocking and deadlocks. This lesson covers both using table locking options and alternative ways of reducing and optimizing locking.

Lesson 1: Overview of Replication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 385 Lesson 2: Transactional Replication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 399 Lesson 3: Merge Replication. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 413 Lesson 4: Designing Failover and Failback Strategies . . . . . . . . . . . . . . . . . . . 421

Investigate t he use of stored procedures in Books Online, and use the appropriate procedures to create and configure a trace.