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DNS servers are authoritative for the zones they host. Forward lookup zones answer queries for IP addresses, and reverse lookup zones answer queries for FQDNs. A DNS server that hosts a primary zone is said to act as a primary DNS server. Pri mary DNS servers store original source data for zones. With Windows Server 2003, you can implement primary zones in one of two ways: as standard primary zones, in which zone data is stored in a text file, or as an Active Directory integrated zone, in which zone data is stored in the Active Directory database. A DNS server that hosts a secondary zone is said to act as a secondary DNS server. Secondary DNS servers are authoritative backup servers for the primary server. The servers from which secondary servers acquire zone information are called masters. A master can be the primary server or another secondary server. A caching-only server forwards all requests to other DNS servers and hosts no zones. However, caching-only servers cache responses received from other DNS servers and can therefore improve name resolution for a network that does not host a zone. New zones contain only two resource records: the SOA record corresponding to the zone, and an NS record corresponding to the local DNS server created for the zone. After you create a zone, additional resource records need to be added to it. The most common resource records to be added are host (A), alias (CNAME), MX, SRV, and PTR.

Now that the procedure has been created, we can execute it just like any Transact-SQL stored procedure. For example, the following Transact-SQL statement will return tomorrow s date in the messages window:

Although we all hope we never have to, a common scenario in which you must restore a database is when you need to revert to the latest backup as part of a disaster recovery effort. To restore a database, follow these steps:

4-44

4

8

1. 2. 3. 4.

Configuring DNS clients generally entails configuring client computer names, specify ing DNS suffixes for these computer names, determining DNS servers for the DNS cli ents to query, and customizing query behavior for these DNS clients. In addition, you can configure how DNS clients update their records in DNS.

Configure computer names that conform to DNS standards Configure a primary DNS suffix for a computer Configure a connection-specific suffix for an adapter Configure a DNS server list for network connections Configure a DNS suffix search list for network connections Configure a DNS client to request dynamic DNS updates View and clear the DNS client cache

In SSMS, right-click the Databases folder, and then select Restore to open the Restore Database dialog box, shown in Figure 8-13. Click the Browse button to locate the backup file, or type the full path in the Backup File box. Expand the Restore Database drop-down list and select the database that you want to restore, or type the database name in the Restore Database box. By default, the server will restore the database in the folder specified by the DataDir server property. If this is not what you want, you can click the Browse button to specify a different location. Select the Allow Database Overwrite check box to restore the backup over an existing database. If you do not want to overwrite the database, you can enter a different database name in the Restore Database box instead of selecting an existing database from the drop-down list. By default, the Include Security Information drop-down list is set to Copy All, and the server will copy the role membership information from the backup file. If you do not want to restore the role membership, select the Skip Membership drop-down list item. If you have encrypted the backup file, which best practice suggests that you should, enter the password in the Password box. Click OK to restore the database.

It has long been established that Transact-SQL is a set-based language and not an object-oriented one. For this reason alone, you should restrict the amount of complex business logic that resides in Transact-SQL stored procedures, user-defined functions, and triggers. Even though there are scenarios where Transact-SQL performs more quickly than code in the .NET Framework, it is generally best to restrict use of Transact-SQL for queries. (For more information about this, refer to Lesson 2, Designing a Cursor Strategy and Lesson 3, Designing Efficient Cursors, in 3, Designing a Cursor and Caching Strategy. ) SQL Server 2005 introduced the ability to execute .NET Framework code on SQL Server, which we covered in the previous section. Now that you have this option, you might need to consider whether moving some of the business logic to the database server is a good idea. SQLCLR is not a magic bullet, and just because it is offered does not mean you should rewrite all your code to utilize it. If you just need to retrieve data, then it is quicker and more efficient to use Transact-SQL. However, if you need to retrieve data and perform complex operations against that data, then SQLCLR might be a better option.