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In this section, we ll focus on the ways you can recover from failures in your SQL Server 7 installation. As we discussed in earlier chapters, many types of data loss can be attributed to user error. A common example is a user executing a DELETE query with an incorrect or missing WHERE clause. In this case, so much data might be lost that a restoration from backup is required. It is important to remember, however, that recovering a lost or corrupted database might only be part of the picture. In addition to recovering database information, you might need to recover your OS. We covered ways to recover data and programs on installations of SQL Server 7 in 3, Data Protection in Windows NT/2000. In that chapter, the basics of fixing situations in which the machine will not boot, reinstalling the OS, and providing for fault-tolerance were described. Be sure you understand those processes, because recovering SQL Server 7 databases is not very useful if your Windows 2000 Server installation is corrupt! Building on the recovery mechanisms covered previously, let s start to look at the actual operations that might be required to recover information stored in SQL Server 7 databases and objects.

that the WHERE clause should include an equi-join condition that matches up LABEL_ID values. Enter and execute the following SQL statement:

Most other SQL implementations:

Although we often use the following terms interchangeably, there is a difference in SQL Server terminology: w v Restoration An operation that copies data from a valid backup file to a new or existing database Recovery The process of bringing a database server back online to a consistent point in time

SELECT FROM WHERE AND CD_TITLE, IN_STOCK COMPACT_DISCS d, CD_LABELS l d.LABEL_ID = l.LABEL_ID COMPANY_NAME = 'Capitol Records';

As you can see, this statement is a lot simpler than the subquery used in the preceding statement, and it returns the same results.

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In general, your restoration operations will likely perform both tasks. In the simplest case, a restoration of a database from a full backup is made. Immediately after the data is restored, a recovery is performed, leaving the database in a usable state and ready to accept client connections. That covers the basics of using full backups, but what about more complex scenarios involving file, filegroup, and transaction log backups In these cases, you ll want to perform all of your data restoration operations first. The last operation will bring the database back online by performing a recovery. A recovery rolls back any transactions that were not committed in the database at the completion of the backup and rolls back any other operations. The end result is a consistent database that is ready for use. For example, assume that we have a database that was backed up using the following operations:

SELECT CEILING(AVG(RETAIL_PRICE_DVD)) AS AVERAGE_DVD_PRICE FROM MOVIE;

the outer subquery. Enter and execute the following SQL statement:

SELECT ARTIST_NAME FROM ARTISTS WHERE ARTIST_ID IN ( SELECT ARTIST_ID FROM ARTIST_CDS WHERE COMPACT_DISC_ID IN ( SELECT COMPACT_DISC_ID FROM COMPACT_DISCS WHERE CD_TITLE = 'Past Light' ) );

7:

The inner subquery returns the COMPACT_DISC_ID value for the Past Light CD. The outer subquery then uses this value to determine the ARTIST_ID value for that CD. This value is then used in the main SELECT statement, which returns one value: William Ackerman. He is the artist on the Past Light CD.

SELECT FLOOR(AVG(RETAIL_PRICE_VHS)) AS AVERAGE_VHS_PRICE FROM MOVIE;

Full backups every Sunday evening Differential backups completed on weeknights, Monday through Saturday, at 9:00 P.M. Transaction log backups performed every hour between the hours of 9:00 A.M. and 6:00 P.M.

8. Now we re going to move on to using subqueries in an UPDATE statement. However,

let s first take a look at the table we re going to update, which is the COMPACT_DISC_ TYPES table. In order to know what to update, we re going to use values from the COMPACT_DISCS table and the MUSIC_TYPES table to help identify the IDs used in the COMPACT_DISC_TYPES table. Enter and execute the following SQL statement:

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