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When this section exists, it presents requirements related to fault toler ance. For example, you might see a requirement stating that all databases must be able to withstand a single drive failure, that a server must include a hot standby, or that a specific database should include some means of failover support. This section presents information related to backup and restore oper ations. It might include, for example, an overview of the planned backup schedule for various databases or it might present a limit of how many restore operations are acceptable to recover a given database. (Note that information about existing as opposed to planned backup operations can be included in a similar section on the Existing Infrastructure page.)

CREATE CERTIFICATE MyCertificate ENCRYPTION BY PASSWORD = 'ghf@BR*hJ98R' WITH START_DATE = '08/12/2006', EXPIRY_DATE = '08/12/2007', SUBJECT = 'caserver.adventure-works.com';

This section includes requirements related to assigning user rights, reduc ing the attack surface of a SQL Server computer, enforcing the principle of least priv ilege, and assigning permissions to database structures. (Note that information about existing as opposed to planned security enforcement can be included in a similar sec tion on the Existing Infrastructure page.)

There are three ways to detect and react to errors in SQL Server 2005:

Maintainability This section deals with administration issues such as consolidating SQL Server instances, deploying Windows and SQL Server updates, scheduling jobs, and designing database schema.

Querying the @@ERROR function. Setting the XACT_ABORT session option. Implementing structured error handling using TRY CATCH blocks.

Remember that every case scenario has slight variations of this general format. Cer tain pages (tabs) might include additional sections, for example. But to make your job easier during the test, you should definitely go into the exam knowing these five pages and what they generally contain.

11

In the following case scenario, you apply what you ve learned about designing a data base server. You can find the answers to the questions in the Answers section at the end of this book.

The ability to use structured error handling is a new feature in SQL Server 2005 and more or less renders the first two ways obsolete. However, you will still find code that uses the first two techniques.

Fabrikam is an online music service based in Ottawa, Canada. The company was cre ated in 2003 as a means to support the needs of independent music fans worldwide.

The @@ERROR function returns the ID (number) of the error message that was caused by the previously executed statement. If the previous statement did not cause an error, the function will return 0. Because it only checks the previous statement, you will need to implement a check against this function after every statement that can cause an error to occur that is, after almost every statement. Below you can see an example of a transaction using the @@ERROR function to handle errors.

The service makes available for download the music of thousands of independentlabel artists whose work is otherwise unavailable through online music stores and tra ditional outlets such as music store chains. The service works through a subscription fee. Three different subscription levels are available: Basic, Plus, and Premium. At each higher subscription level, a subscriber can download more songs per month at a lower cost per song. When subscribers con nect to the Fabrikam Web site, they log on with a user name and password to access their account and then download songs.

If you omit the ENCRYPTION BY PASSWORD clause, SQL Server encrypts the certificate with the master key for the current database. This action is required in certain situations, such as when creating a certificate to authenticate a Service Broker endpoint.

Beginning in 2005, Fabrikam began to see a strong increase in the number of sub scribers, a trend that has continued to the present day. As a result of this growth, the response time for users logging in to the Web site has begun to increase noticeably. At present, Fabrikam has approximately 55,000 registered subscribers. Studies have shown that no more than 10 percent of the current subscribers are ever logged on at any one time.

BEGIN TRAN; INSERT T1 (Col) VALUES (1); IF(@@ERROR <> 0) GOTO ErrorHandler; INSERT T1 (Col) VALUES (2); IF(@@ERROR <> 0) GOTO ErrorHandler; INSERT T1 (Col) VALUES (3); IF(@@ERROR <> 0) GOTO ErrorHandler; COMMIT TRAN; RETURN; ErrorHandler:

To solve the problem of poor response times, the company owner, Tom McMartin, has ordered a capacity planning study. The study has two specific aims: first, to determine whether the database server (named DBSRV1) that is currently holding the customer accounts is experiencing a performance bottleneck in the processor, memory, or disk subsystems; second, if a bottleneck is spotted, to design a replacement database server that meets the technical and business requirements of the company for the next four years.