Review in .NET

Printer PDF-417 2d barcode in .NET Review

4 Review
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page split root node
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Case Scenario: Indexing a Database
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In the following case scenario, you will apply what you ve learned in this chapter. You can find answers to these questions in the Answers section at the end of this book. Contoso Limited, a health care company located in Bothell, WA, has just implemented a new patient claims database. Over the course of one month, more than 100 employees entered all the records that used to be contained in massive filing cabinets in the basements of several new clients. Contoso formed a temporary department to validate all the data entry. As soon as the data-validation process started, the IT staff began to receive user complaints about the new database s performance. As the new database administrator (DBA) for the company, everything that occurs with the data is in your domain, and you need to resolve the performance problem. You sit down with several employees to determine what they are searching for. Armed with this knowledge, what should you do
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To help you successfully master the exam objectives presented in this chapter, complete the following practice tasks.
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Practice 1 Practice 2
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Locate all the tables in your databases that do not have primary keys. Add a primary key to each of these tables. Locate all the tables in your databases that do not have clustered indexes. Add a clustered index or change the primary key to clustered for each of these tables. Identify poorly performing queries in your environment. Create nonclustered indexes that the query optimizer can use to satisfy these queries. Identify the queries that can take advantage of covering indexes. If indexes do not already exist that cover the queries, use the included columns clause to add additional columns to the appropriate index to turn it into a covering index.
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Practice 3 Practice 4
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4 Review
Take a Practice Test
The practice tests on this book s companion CD offer many options. For example, you can test yourself on just the content covered in this chapter, or you can test yourself on all the 70-431 certification exam content. You can set up the test so that it closely simulates the experience 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.
MORE INFO
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.
5
Working with Transact-SQL
The query language that Microsoft SQL Server uses is a variant of the ANSI-standard Structured Query Language, SQL. The SQL Server variant is called Transact-SQL. Database administrators and database developers must have a thorough knowledge of Transact-SQL to read data from and write data to SQL Server databases. Using Transact-SQL is the only way to work with the data.
Exam objectives in this chapter:
Retrieve data to support ad hoc and recurring queries.
Construct SQL queries to return data. Format the results of SQL queries. Identify collation details. Insert, update, and delete data. Handle exceptions and errors. Manage transactions.
Manipulate relational data.
Lessons in this chapter:
Lesson 1: Querying Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 171 Lesson 2: Formatting Result Sets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 186 Lesson 3: Modifying Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 192 Lesson 4: Working with Transactions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 198
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