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  3. You are the administrator of a SQL Server 2000 computer. The server is configured as shown in the Database Server Configuration

You are the administrator of a SQL Server 2000 computer. The server is configured as shown in the Database Server Configuration

admin2009-05-19  59
问题 You are the administrator of a SQL Server 2000 computer. The server is configured as shown in the Database Server Configuration exhibit.


You need to create a new database named Inventory. Employees in your company will use the Inventory database to track inventory data. Users will require immediate responses to queries that help them locate where parts are stored. The tables in the database will be configured as shown in the Database Schema exhibit.


The database will consume 14 GB of disk space. You must configure the data files and transaction log to accelerate query response time.

Which two courses of action should you take? (Each correct answer represents part of the solution. Choose two.)

A. On drive C, create a transaction log.
   On drive D, create a data file in the PRIMARY filegroup.
   On drive E, create a data file in the SECONDARY filegroup.
B. On each drive, create a transaction log.
   On each drive, create a data file in the PRIMARY filegroup.
C. On drive D, create a transaction log.
   On drive E, create a data file in the PRIMARY filegroup.
D. On the PRIMARY filegroup, create all tables and all indexes.
E. On the PRIMARY filegroup, create all tables. On the SECONDARY filegroup, create all indexes.
F. On the PRIMARY filegroup, create the Parts table and its indexes.
   On the SECONDARY filegroup, create all other tables and their indexes.
选项
答案A,E
解析 Explanation:
A: The transaction log should be placed on a separate disk. A transaction log would not benefit of two or more disks since it is sequential. Create two data files on two separate physical disks would improve performance.

E: Separating the tables and the indexes improve performance for in particular joins.

Note: With SQL Server 2000 it is possible to create tables or indexes on specific filegroups. This allows us to control where the database’s tables and indexes are physically located as filegroups can be placed on different hard drives. Placing tables in one filegroup and the table’s nonclustered indexes in another filegroup on different physical disk can improve database performance because it will allow separate threads to access the tables and indexes.

However, a table and its clustered index cannot be separated into different filegroups as the clustered index determines the physical order of the data in the table. Furthermore, the transaction log should be placed on a physically separate disk. The transaction log file is written serially; therefore, using a separate, dedicated disk allows the disk heads to stay in place for the next write operation. This will further improve performance.

Incorrect Answers:
B: To improve performance, the transaction log should not be placed on the same physical disk that the tables or indexes are placed on. The transaction log file is written serially; therefore, placing it on a separate, dedicated disk allows the disk heads to stay in place for the next write operation and thus improves performance.

Furthermore, placing tables in one filegroup and the table’s nonclustered indexes in another filegroup on different physical disk can improve database performance because it will allow separate threads to access the tables and indexes. However, a table and its clustered index cannot be separated into different filegroups as the clustered index determines the physical order of the data in the table.

C: The transaction log should be placed on a physically separate disk. The transaction log file is written serially; therefore, using a separate, dedicated disk allows the disk heads to stay in place for the next write operation. This will further improve performance. In this solution, the tables and their indexes are placed on the same disk. This solution thus does not take advantage of the performance improvements that can be realised through the correct utlization of the available hardware.

D: In this solution, the tables and their indexes are placed on the same disk. This solution thus does not take advantage of the performance improvements that can be realised through the correct utlization of the available hardware.

F: Greater performance gains can be realized by placing tables in one filegroup and the table’s nonclustered indexes in another filegroup on different physical disk. This will allow separate threads to access the tables and indexes.
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