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Do you know what these key terms mean You can check your answers by looking up the terms in the glossary at the end of the book.
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bcp BULK INSERT
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extraction, transformation, and loading (ETL) flat file point-in-time recovery recovery model source target or destination
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Case Scenario: Fixing a Bloated Transaction Log
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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. A company has data in several flat files that it loads into its Logging table once per week. The IT team does the load during a weekly maintenance window, during which it also performs backups. Members of the team want to do the backups after the data load is complete, but they have found that the database log files are nearly full after about 70 percent of the files are loaded. Therefore, they have to complete a log backup before the loading can finish, which puzzles the database administrators (DBAs) because they are setting the recovery model of the database to Bulk-Logged before the loads start. The Logging table contains five weeks worth of logs, and before the latest week is loaded, the oldest week is deleted. The company is currently working on a partitioning strategy, but needs help in the meantime. The company is loading the data by using the BULK INSERT command. The Logging table has a clustered index on the primary key, which is an identity column, and four nonclustered indexes. You review the loading scripts and find that the BULK INSERT commands are not using any hints and that the scripts do not do anything to the table except delete and bulk insert data. You also find that the beginning and ending identity value for each week s load is stored in another table. What should you do to help minimize logging during the data loads
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Suggested Practices
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To help you successfully master the exam objectives presented in this chapter, complete the following tasks.
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Using bcp and BULK INSERT to Load Tables
Create a data file, practice loading this file by using bcp with different parameters, and note the differences in load behavior.
Practice 1 Practice 2
Using the same data file as in Practice 1, practice loading the file by using BULK INSERT with different options and note the difference in load behavior.
Using SSIS to Load Tables
Practice 1
Using the same file as the previous practices, try loading the table by using the SSIS Import/Export Wizard. Be sure to save the package created by the wizard for later review. Open the SSIS package that was saved in the preceding practice and review the data flow to see how the wizard constructed the import. Try changing several options in the package designer and note what happens when you run the package.
Practice 2
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.
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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.
11
Backing Up, Restoring, and Moving a Database
Maintaining at least one copy of an operational database in case of a disaster is the most fundamental task a database administrator (DBA) can perform. And performing a database backup is the most common method for accomplishing this task. Just because performing a database backup is a common operation, however, does not mean it is unimportant. This chapter emphasizes how important database backups are to your restore strategy, which defines how you can recover your database while meeting business requirements for allowed amounts of downtime and maximum data loss. Without a restore strategy, backing up a database has virtually no purpose. After describing Microsoft SQL Server s flexible options for backing up a database, this chapter explains how to restore those backups to recover data up to a specific point in time. You will also learn how to move databases by using backup/restore, detach/attach, or the Copy Database Wizard.
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