Oracle Database 11 g - Online Public Access Catalog

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282 CHAPTER 6 ■ BACKUP AND RECOVERYValidating with the validate CommandWe’ll present some examples that show how to validate various database objects in order toillustrate the range of the new validate command. Here’s an example showing how to validatea backup set by using the validate command:RMAN> validate backupset 7;Starting validate at 21-MAY-07using target database control file instead of recovery catalogallocated channel: ORA_DISK_1channel ORA_DISK_1: SID=193 device type=DISKchannel ORA_DISK_1: starting validation of datafile backup setchannel ORA_DISK_1: reading from backup piece C:\ORCL11\APP\ORACLE\PRODUCT\11.1.0\DB_1\DATABASE\5TIFHU1H_1_1channel ORA_DISK_1: piece handle=C:\ORCL11\APP\ORACLE\PRODUCT\11.1.0\DB_1\DATABASE\5TIFHU1H_1_1 tag=TAG20070419T081823channel ORA_DISK_1: restored backup piece 1channel ORA_DISK_1: validation complete, elapsed time: 00:00:01Finished validate at 21-MAY-07RMAN>You can validate an individual block in a datafile by specifying the datafile and block numbers,as shown in the following example:RMAN> validate datafile 2 block 24;The block-level validation shown here is the lowest level of granularity that you can go towith the validate command. On the other extreme, you can use the validate command tocheck the entire database at once, as shown in the following example:RMAN> validate database;Starting validate at 21-MAY-07using channel ORA_DISK_1channel ORA_DISK_1: starting compressed full datafile backup setchannel ORA_DISK_1: specifying datafile(s) for validationinput datafile file number=00002 name=C:\ORCL11\APP\ORACLE\ORADATA\1\SY01.DBF...channel ORA_DISK_1: validation complete, elapsed time: 00:11:24List of Datafiles=================File Status Marked Corrupt Empty Blocks Blocks Examined High SCN---- ------ -------------- ------------ --------------- ----------1 OK 0 12542 72960 7236557File Name: C:\ORCL11\APP\ORACLE\ORADATA\ORCL11\SYSTEM01.DBFBlock Type Blocks Failing Blocks Processed
CHAPTER 6 ■ BACKUP AND RECOVERY 283---------- -------------- ----------------Data 0 48959Index 0 9143Other 0 2316...channel ORA_DISK_1: specifying datafile(s) for validationincluding current control file for validationchannel ORA_DISK_1: validation complete, elapsed time: 00:00:02List of Control File and SPFILE===============================File Type Status Blocks Failing Blocks Examined------------ ------ -------------- ---------------Control File OK 0 594Finished validate at 21-MAY-07RMAN>The validate command begins with the message “Starting validate” and not “Startingbackup,” as is the case when you issue the backup ... validate command. The semantics,however, of the new validate command are similar to those of the old backup ... validatecommand, and both commands work in a similar fashion. The big advantage to using the newvalidate command is that it can check at a more granular level than the old backup ...validate command, including at the data block level. You can also apply the new validatecommand to a much larger number of objects, including such objects as the recovery area.■Note The validate command checks only for intrablock corruption both physical and logical in nature.It doesn’t check for interblock corruption.Speeding Up Validation with the Section Size ClauseIf you want to validate a very large datafile fast, use the section size clause with the validatecommand. The section size clause works similarly to the section size clause during a multisectionbackup, which we discussed earlier in this chapter. Make sure you first configure multiplebackup channels in order to parallelize the datafile validation when you run the validatecommand. The following example shows how to parallelize the validation of a large datafile byusing the section size clause to break up the job into two parallel streams:RMAN> run2> {3> allocate channel ch1 device type disk;4> allocate channel ch2 device type disk;5> validate datafile 2 section size = 500m;6> }
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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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226 CHAPTER 5 ■ DATABASE SECURITY
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CHAPTER 7 ■ DATA PUMP 333DBMS_OUT
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338 CHAPTER 8 ■ ORACLE STREAMSLat
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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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418 CHAPTER 10 ■ DATA GUARDsql ch
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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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600 ■INDEXOracle Audit Vault, 259
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