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One problem that may occur due to a hardware or software failure is the inability to boot the server. Troubleshooting the problem can be quite difficult, because you can t even access a console on the local machine. There are, however, several ways to fix your system when such problems occur. The first step in resolving the problem is to determine what has occurred. In some cases, the problem might be the overwriting of the boot sector on the hard drive. In others, however, much more widespread data corruption or hardware failures may have occurred. The general process to restore a server from backups involves the following steps: 1. Replace the failed hardware (if necessary). 2. Reconfigure disk devices (if necessary). If you re using RAID, multiple partitions, or other disk configurations, you may be required to repartition your disks prior to reinstalling the operating system. 3. Reinstall the operating system. 4. Reinstall all software and drivers required to access the backup device (usually only necessary for tape backups). 5. Fully restore the operating system and any data that has been lost. 6. Test the restoration. Following a reboot of the operating system, you should test your server to ensure that it is working. The preceding operations probably seem like a lot of time-consuming work. Make no mistake, they are! However, based on your business requirements, it might be acceptable. Later in this chapter, we ll look at ways in which you can plan for and manage the time required to restore database information.

SELECT COUNT(*) FROM PERSON WHERE UPPER(PERSON_FAMILY_NAME) LIKE '%A%';

These results are then used by the IN predicate to compare them to the CD_TITLE values in the CD_STOCK table. When you execute the entire SELECT statement, you receive the following results:

CD_TITLE --------------Blue Court and Spark STOCK ----42 22

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In 5, Evaluating Data Protection Solutions, we looked at the types of features that are available in many backup software solutions. One feature supported by several of the packages is often called a disaster recovery option. This feature allows systems administrators to recover from a total loss of data on a server (or loss of the server itself) without requiring all the steps necessary for a manual reinstallation. Specifically, disaster recovery options usually include a minimal set of drivers that can be used to access the tape backup or other devices without requiring the installation of the entire OS. This reduces the complete recovery process to the following steps: 1. Boot the system from the disaster recovery media. Usually, this will mean booting from one or more floppy disks, but can also include other bootable media, such as CD-ROM drives. 2. Recover information from the appropriate backup tapes.

Notice that only two rows are returned from the CD_STOCK table. These rows represent the two CDs performed by Joni Mitchell. Even though the CD_STOCK table does not include artist information, you can still tie data from the two tables together because they include similar columns, allowing you to use the data returned by a subquery.

SELECT FROM WHERE OR OR MOVIE_TITLE MOVIE UPPER(MOVIE_TITLE) LIKE '% THE %' UPPER(MOVIE_TITLE) LIKE 'THE %' UPPER(MOVIE_TITLE) LIKE '% THE';

This process can save considerable time and effort in reloading the OS. However, be sure that you understand the procedures for your backup solution before you have to test it under pressure!

In the case of the example table shown in Figure 12-1, it is conceivable that a foreign key would be configured on the CD_TITLE column of the CD_STOCK table to reference the TITLE column of the CD_ARTISTS table. However, a foreign key relationship is not required. The primary requirement that a subquery must meet is that it return results that are logically comparable to the referencing column values. Otherwise, the subquery serves no purpose, and no rows will be returned by the primary SELECT statement because the condition of the IN predicate cannot be met.

12:

A primary requirement when using RDBMSs is consistency. All information must be current up to a certain point in time. If it is not, incorrect or misleading data may be reported. Due to hardware or software failures, it is possible for databases to become corrupt. If there is an internal inconsistency in one or more of the database files on your server, you can attempt to fix them. SQL Server includes several built-in tools for dealing with lost information and corrupted server installations. In this section, we ll look at tools and methods for recovering from these types of failures.

SELECT SUM(RENTAL_FEE) AS TOTAL_RENTAL_FEES FROM MOVIE_RENTAL;

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