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Assuming a complete loss of the database occurs on Thursday at 11:53 A.M., we ll need to restore from several backups and then recover the database to bring it back online. The exact sequence of steps is as follows: 1. Restore from the full database backup. 2. Restore differential backup from Wednesday. 3. Restore transaction log backups from 9:00 A.M. and 10:00 A.M. 4. Restore the transaction log backup from 11:00 A.M. with recovery. Figure 7-3 illustrates the database restoration and recovery operations required to bring this installation back online to the latest point in time allowable by the backups. When performing a backup, SQL Server also provides the ability to save an undo log file to disk. This file is used mainly for the purpose of establishing and maintaining standby servers (a topic we ll cover in 8, Advanced Data Protection Tactics ). Fortunately, as we ll see later in this chapter, the tools and utilities included with SQL Server 7 can make these complex operations much easier to manage. Now that we have an overview of the processes involved, let s move on to look at how we can use the specific backup types.

SELECT 'ALTER TABLE ' || TABLE_NAME || ' DROP CONSTRAINT ' || CONSTRAINT_NAME || ';' FROM USER_CONSTRAINTS WHERE CONSTRAINT_TYPE = 'R';

SELECT FROM WHERE AND AND CD_TITLE, TYPE_NAME COMPACT_DISCS d, COMPACT_DISC_TYPES t, MUSIC_TYPES d.COMPACT_DISC_ID = t.COMPACT_DISC_ID t.MUSIC_TYPE_ID = m.TYPE_ID CD_TITLE = 'Kojiki'; m

In this statement, you join three tables to return the CD_TITLE value and TYPE_NAME value for the Kojiki CD. The CD is classified as New Age.

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Differential backups contain only the data that has changed since the time of the last full backup. Therefore, they are generally smaller than full backups and require less time to perform. When recovering data, however, you should keep in mind that you must have a working copy of the most recent full backup before you can begin restoring data. If several differential backups have been performed since the last full backup, you will likely want to use the most recent one. However, any of the backups can be used if, for example, you want to restore to a point before the last differential backup was made or if one or more of the backups is corrupt, missing, or otherwise unusable. Differential backups provide a good way to optimize backup plans, but do support some of the functions of transaction log backups (covered next).

(continued)

SELECT NAME FROM SYSOBJECTS WHERE XTYPE = 'F';

New Age music type. You ll change the music type from New Age to Classical. Enter and execute the following SQL statement:

Transaction log backups frequently are used in circumstances where other backup types are not feasible. The transaction log stores information about the various database transactions that have been performed on the server since the log was last truncated. Generally, backing up the transaction log will take much less time than backing up the entire database, because only information about data that was modified is required. Addi-

UPDATE COMPACT_DISC_TYPES SET MUSIC_TYPE_ID = ( SELECT TYPE_ID FROM MUSIC_TYPES WHERE TYPE_NAME = 'Classical' ) WHERE COMPACT_DISC_ID = ( SELECT COMPACT_DISC_ID FROM COMPACT_DISCS WHERE CD_TITLE = 'Kojiki' ) AND MUSIC_TYPE_ID = ( SELECT TYPE_ID FROM MUSIC_TYPES WHERE TYPE_NAME = 'New Age' );

Figure 7-3.

SELECT CUSTOMER_ACCOUNT_ID, CASE CHILD_RENTAL_ALLOWED_INDIC WHEN 'Y' THEN 'Child Rental OK' WHEN 'N' THEN 'NO CHILD RENTAL' END AS CHILD_RENTAL FROM CUSTOMER_ACCOUNT ORDER BY CUSTOMER_ACCOUNT_ID;

The statement uses a subquery in the SET clause to pull the TYPE_ID value from the MUSIC_TYPES table. The statement also uses two subqueries in the WHERE clause of the UPDATE statement to determine which row to update in the COMPACT_DISC_TYPES table. The first subquery in the WHERE clause returns the COMPACT_DISC_ID value for the Kojiki CD. The second subquery returns the TYPE_ID value for the Classical music type.

execute the following SQL statement:

tionally, less storage space is required to record transaction log backups. In addition to these benefits, transaction log backups provide additional flexibility when performing restoration operations. Specifically, transaction logs can be recovered up to a specific point in time. We ll cover this topic in the next section. When you re recovering data from transaction logs, it is important to remember two points: w The restoration operation must begin with a valid full or differential backup. Transaction log backups can be used only when the last full or differential backup set is available. Restoring from these backups ensures that the database is consistent to a point in time and that all data is present. Transaction logs must be applied sequentially. When multiple transaction logs are required to bring a database consistent to a time nearest the failure, all of the transaction log backups must be available. Since an unbroken chain of these files is required, you should take great care to ensure that all the files are valid during your backup process. If one of the files is corrupt, missing, or otherwise unusable, you will be able to recover only up to the point where the chain is broken.

SELECT FROM WHERE AND AND CD_TITLE, TYPE_NAME COMPACT_DISCS d, COMPACT_DISC_TYPES t, MUSIC_TYPES d.COMPACT_DISC_ID = t.COMPACT_DISC_ID t.MUSIC_TYPE_ID = m.TYPE_ID CD_TITLE = 'Kojiki'; m

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