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Lesson 1: Designing Database Tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 441 Lesson 2: Designing Filegroups. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 480 Lesson 3: Planning Indexes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 487 Lesson 4: Designing Database Views . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 499 Lesson 5: Designing Database Procedures. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 508 Lesson 6: Creating Database Conventions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 516

To complete the lessons in this chapter, you must have an instance of SQL Server installed with the AdventureWorks sample database.

An asymmetric key is made up of a private key and the corresponding public key. Each key can decrypt data encrypted by the other. Asymmetric encryption and decryption are fairly expensive operations, but they provide a higher level of security than symmetric encryption. An asymmetric key can be used to encrypt a symmetric key for storage in a database. Symmetric keys A symmetric key is one key that is used for both encryption and decryption. Encryption and decryption by using a symmetric key is fast and is suitable for routine use with sensitive data in the database.

In this practice, you generate a counter log and add the relevant counters. In a production environment, you would configure this log to run over a 24-hour period and set the counter sampling intervals accordingly. For convenience, this practice configures the log to run for 5 minutes with a sampling period of 10 seconds.

The foundations of a database are the table structures. Without tables to store data, a database is relatively useless. Unfortunately, too many databases are designed in a less than optimal way. You need to be able to capture the data required by the business while at the same time enforcing all rules and consuming the least amount of storage space possible. The thing to always remember in table design is that although disk space is virtually unlimited and inexpensive, the memory that all database servers rely on to process and cache data for fast retrieval and manipulation is very limited and very expensive. Consuming an extra two bytes of storage for a column of data is reasonably trivial in terms of disk space, even when you are dealing with millions of rows of data. How ever, the extra two bytes of storage are significant in terms of inefficient memory uti lization and can make the difference between a database that performs well and a database that is unusable by a business. This lesson focuses on all the design elements that you must take into account to effi ciently design table structures.

After this lesson, you will be able to:

One of the most common uses of certificate-based security in SQL Server 2005 is configuring and utilizing Secure Sockets Layer (SSL) communication between clients and the server. SQL Server 2005 can use SSL to encrypt data that is transmitted across a network between an instance of SQL Server and a client application. The SSL encryption is performed within the protocol layer and is available to all SQL Server clients. SSL can be used for server validation when a client connection requests encryption. If the instance of SQL Server is running on a computer that has been assigned a certificate from a public certification authority, identity of the computer and the instance of SQL Server is vouched for by the chain of certificates that lead to the trusted root authority. Such server validation requires that the computer on which the client application is running be configured to trust the root authority of the certificate that is used by the server. Encryption with a selfsigned certificate is possible, but a self-signed certificate offers only limited protection. Enabling SSL encryption increases the security of data transmitted across networks between instances of SQL Server and applications. However, enabling encryption does slow performance. When all traffic between SQL Server and a client application is encrypted using SSL, the following additional processing is required:

Ensure that a database is normalized. Allow selected denormalization for performance purposes. Ensure that the database is documented and diagrammed. Decide if partitioning is appropriate. Specify primary and foreign keys. Specify column data types and constraints. Decide whether to persist computed columns.

An extra network round-trip is required at connect time. Packets sent from the application to the instance of SQL Server must be encrypted by the client Net-Library and decrypted by the server Net-Library. Packets sent from the instance of SQL Server to the application must be encrypted by the server Net-Library and decrypted by the client Net-Library.