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RMAN provides the useful CROSSCHECK command to enable you to check that the backup sets and image copies listed in the recovery catalog actually exist in their specified locations and haven t been accidentally deleted or written over. In addition, the command verifies the headers and ensures that RMAN can read the files. The CROSSCHECK command can thus test both the existence and the readability of the backups. Here s an example of the use of the CROSSCHECK command in RMAN: RMAN> CROSSCHECK BACKUPSET 326; allocated channel: ORA_DISK_1 . . . channel ORA_DISK_4: sid=21 devtype=DISK crosschecked backup piece: found to be 'AVAILABLE' Crosschecked 1 objects RMAN> As you can see, RMAN has cross-checked the backup piece and found it to be available, which confirms that the backup files exist and are usable.
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Using the RMAN VALIDATE Command
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RMAN helps detect both physical and logical corruption. When RMAN encounters corrupt blocks of either kind, it logs the information to the control file and the recovery catalog. The VALIDATE command helps you ensure that the backed-up files exist in the proper locations, and that they are readable and free from any logical and physical corruption. You simply issue the following command to test any particular backup set: RMAN> VALIDATE BACKUPSET 9; To test the entire database and archived log backup sets, you issue the following command: RMAN> BACKUP VALIDATE DATABASE ARCHIVELOG ALL; If the backup set does not exist, RMAN will let you know. If the command does not result in any errors, you can assume that the specified backup set exists and can be used in the recovery process. The following command doesn t restore any datafiles; it merely validates that the contents of the backup sets are restorable. RMAN> RUN { ALLOCATE CHANNEL d1 TYPE DISK; RESTORE DATABASE VALIDATE; {
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CHAPTER 15 BA CK ING UP DA TA BAS ES
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The BACKUP_VALIDATE command checks for both logical and physical corruption in the datafiles and also determines whether RMAN can back up a datafile. By ensuring that RMAN can back up your datafiles, you know that your RMAN backups will be usable and valid. You can use the BACKUP_VALIDATE command only at the dataset level, whereas you can use the VALIDATE command at the backup set, tablespace, datafile, or even data block level. You can also use the latter command to check the integrity of the flash recovery area. You can proactively run the VALIDATE command to check for missing datafiles or corrupt data blocks. RMAN logs any failures it finds during the validate command execution in the Automatic Diagnostic Repository (ADR). You can then use the Data Recovery Advisor to view the failures and to fix them. Although by default the VALIDATE command checks for physical data block corruption (interblock), you can specify the CHECK LOGICAL clause to include logical intrablock corruption checks. Here s an example that shows how to execute the VALIDATE DATABASE command to check for data block corruption at the database level: RMAN> VALIDATE DATABASE; Starting validate at 01-APR-08 using target database control file instead of recovery catalog allocated channel: ORA_DISK_1 channel ORA_DISK_1: SID=155 device type=DISK . . . channel ORA_DISK_1: validation complete, elapsed time: 00:17:07 List of Datafiles ================= File Status Marked Corrupt Empty Blocks Blocks Examined High SCN ---- ------ -------------- ------------ --------------- ---------1 OK 0 12542 72960 4351550 File Name: C:\ORCL11\APP\ORACLE\ORADATA\ORCL11\SYSTEM01.DBF Block Type Blocks Failing Blocks Processed ---------- -------------- ---------------Data 0 48959 Index 0 9143 Other 0 2316 . . . including current control file for validation including current SPFILE in backup set channel ORA_DISK_1: validation complete, elapsed time: 00:00:02 List of Control File and SPFILE =============================== File Type Status Blocks Failing Blocks Examined ------------ ------ -------------- --------------SPFILE OK 0 2 Control File OK 0 594 Finished validate at 01-APR-08 RMAN> You can parallelize the database validation by specifying the SECTION SIZE parameter, which divides a file into sections.
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