RMAN 11G : Data Recovery Advisor - RMAN command line example 

What Is the Data Recovery Advisor?

The Data Recovery Advisor is a tool that helps you to diagnose and repair data failures and corruptions. The Data Recovery Advisor analyzes failures based on symptoms and intelligently determines optimal repair strategies. The tool can also automatically repair diagnosed failures.

The Data Recovery Advisor is available from Enterprise Manager (EM) Database Control and Grid Control. You can also use it via the RMAN command-line.

This DRA commands are available within RMAN:

List Failure     # lists the results of previously executed failure assessments. Revalidates existing failures and closes them, if possible.
Advise Failure   # presents manual and automatic repair options
Repair Failure   # automatically fix failures by running optimal repair option, suggested by ADVISE FAILURE. Revalidates existing failures when completed.
Change Failure # enables you to change the status of failures.

Restrctions:

Data Recovery Advisor supports single-instance databases. Oracle Real Application Clusters databases are not supported in 11.1.0.6 -> 11.1.0.8. Data Recovery Advisor cannot use blocks or files transferred from a standby database to repair failures on a primary database. Also, you cannot use Data Recovery Advisor to diagnose and repair failures on a standby database. However, the Data Recovery Advisor does support failover to a standby database as a repair option (as mentioned above).

Examples:

RMAN> list failure;
RMAN> advise failure;
RMAN> repair failure;
RMAN> change failure 522 closed;

Others Command:

RMAN> list failure low;
RMAN> list failure high;
RMAN> list failure critical;
RMAN> repair failure preview;
RMAN> change failure 522 priority low;