Oracle Database 11 g - Online Public Access Catalog

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280 CHAPTER 6 ■ BACKUP AND RECOVERYThe change command converts a routine weekly backup in this case to an archival backupthat never becomes obsolete (keep forever). The change command thus changes the exemptionstatus of a backup or copy vis-à-vis the configured retention policy. If you want to make along-term backup that’s ineligible for deletion into one that’s eligible for deletion (that is, eligiblefor the obsolete status), you can do so by issuing the change ... nokeep command, as shown here:RMAN> change copy of database controlfile nokeep;■Note You can’t use the change ... keep command for backup files stored in the flash recovery area.The nokeep option brings the long-term image copies for both datafiles and controlfilesback under the purview of the configured retention policy, thus guaranteeing that eventuallythey become eligible for the obsolete status again.Restoring an Archival BackupThe easiest way to restore an archival backup is by using the duplicate command after creatinga temporary instance. Here’s a quick summary of the procedure:1. Prepare the auxiliary instance, which includes the duplicate command’s usual preparatorysteps for creating an auxiliary instance, such as creating the password file and theinitialization parameter file. You must also establish Oracle Net connectivity to the auxiliaryinstance and start the auxiliary instance.2. Connect to the recovery catalog, the target, and the auxiliary instances, as shown here:RMAN> connect target sys/@prod1RMAN> connect catalog rman/rman@catdbRMAN> connect auxiliary /3. Issue the list restore point all command to see the available restore points in thedatabase:RMAN> list restore point all;SCN RSP Time Type Time Name------- -------- ----- ------- --------------3074299 21-MAY-07 FIRSTQUART07RMAN>4. Issue the duplicate database command, making sure you specify the restore point towhich you’d like to restore the database, using the archival backup:
CHAPTER 6 ■ BACKUP AND RECOVERY 281RMAN> duplicate database2> to newdb3> until restore point firstquart074> db_file_name_convert='/u01/prod1/dbfiles/',5>'/u01/newdb/dbfiles'6> pfile = '/u01/newdb/admin/init.ora';The duplicate command shown here creates a new controlfile instead of restoring thecontrolfile of the target database. The restore point you created earlier with the keep commandand the SCN corresponding to it are recorded in both the recovery catalog if you’re using oneand the target database controlfile. Since you need the SCN for duplicating the database untilthe restore point that you specified (firstquart07), you must either use a recovery catalog oruse the target database controlfile, as long as the restore point is still there and hasn’t beenoverwritten.The New Validate CommandIn Oracle Database 10g, you had access to two backup validation commands. The validatebackupset command lets you validate a specific backup set when one or more backup pieceswere suspected to be damaged or even missing. RMAN would check all the backup pieces inthe backup set and see whether their checksums were correct to verify that the backup set wasOK and good for use in a recovery situation. You can still use this command when you suspectcorruption in a backup set.In addition to the validate backupset command, the previous release of the Oracle databaseprovided the backup validate command to perform checks on specified files to confirmthat they could be backed up correctly. The backup validate command checks for both physicaland logical corruption in the datafiles. In addition, the command also verifies that all databasefiles are indeed where they are supposed to be. For example, you can issue the backup validatecommand to check all database files as well as the archived redo logs of a database by issuingthe following command:RMAN> backup validate database archivelog all.RMAN would go through all the motions of an actual backup, except it doesn’t produceany backup sets—it merely reads each datafile and archived redo log to confirm that they aren’tcorrupted and that they can be backed up successfully. Any corruptions found would be recordedin the V$DATABASE_BLOCK_CORRUPTION view.In Oracle Database 11g, you can use the new validate command to check for corruption at afiner level of granularity than the old backup validate command. You can use this command tovalidate datafiles, backup sets, and even individual data blocks. Note that the new validatecommand is semantically equivalent to the backup validate command in the previous release.You use the validate command to check for things such as missing datafiles or corruptdata blocks. You also run the command to assure yourself that a backup set is restorable. IfRMAN finds that the validate command has trapped any errors, it automatically triggers afailure assessment. If any failures are found, RMAN will log it into the automatic diagnosticrepository. You can use the Data Recovery Advisor command list failure to view all the failureslogged in the ADR. Chapter 2 explains the ADR in detail.
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The EXPERT’s VOIce ® IN ORACLEAl
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Contents at a GlanceAbout the Autho
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■CONTENTSixSQL*Plus New Features
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■CONTENTSxiEnterprise Manager Int
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■CONTENTSxiiiCombined Capture and
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■CONTENTSxvImprovements in Redo T
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About the Authors■SAM ALAPATI is
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xxii■ACKNOWLEDGMENTSNothing I do
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xxiv■INTRODUCTIONPerformance Mana
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xxvi■INTRODUCTION• The easy add
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226 CHAPTER 5 ■ DATABASE SECURITY
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228 CHAPTER 5 ■ DATABASE SECURITY
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CHAPTER 7 ■ DATA PUMP 333DBMS_OUT
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CHAPTER 9■ ■ ■Storage Managem
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CHAPTER 9 ■ STORAGE MANAGEMENT 36
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416 CHAPTER 10 ■ DATA GUARD• Lo
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446 CHAPTER 11 ■ APPLICATION DEVE
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CHAPTER 12■ ■ ■Data Warehousi
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566 ■INDEXadvise failure command,
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568 ■INDEXDBMS_ADDM package, 216-
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600 ■INDEXOracle Audit Vault, 259
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Oracle Database 11 g - Online Public Access Catalog

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