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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; {

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.

Figure 3-29. Using a secondary shared resource to unblock the sender of a synchronous notification sent using a shared resource Two shared resources are used one (SR 1) for the forward notification, from A to B, and one (SR 2) for the return notification, from B to A. A writes the n1 notification to SR- and then blocks, waiting for B to send some kind of endSignal, denoting completion and also returning optional data from the n1 notification handler.

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\SYSTEM01DBF 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..

The control file is critical for recovery, as it contains crucial information like database checkpoints and the datafile header checkpoints for the datafiles. A recovery is much harder when you lose all

Asynchronous delivery is commonly used in distributed systems, in which the sender and receiver are in different process spaces or machines. The sender sends a notification without blocking and continues on while the receiver is busy handling the notification. There are two main scenarios, in terms of the overall interaction between sender and receiver: 1. The sender doesn t care about the outcome of processing in the receiver. 2. The sender does care about the outcome of processing in the receiver or needs to know when the receiver has finished handling the notification. In the first case, called a fire-and-forget notification, the sender doesn t need to get information back from the receiver. In the second case, the sender needs to be informed when the receiver has finished handling the notification. In the return notification, the receiver can furnish status information,