About Data Recovery Advisor

About Data Recovery Advisor
In the context of Data Recovery Advisor, a health check is a diagnostic procedure run
by the Health Monitor to assess the state of the database or its components. Health
checks are invoked reactively when an error occurs. You can also invoke checks
manually.
A failure is a persistent data corruption detected by a health check. Failures are
usually detected reactively. A database operation involving corrupted data results in
an error, which automatically invokes a health check in the database. The check
searches the database for failures related to the error. If failures are diagnosed, then
they are recorded in the Automatic Diagnostic Repository (ADR).
You can use Data Recovery Advisor to generate repair advice and repair failures only
after failures have been detected by the database and stored in ADR. Data Recovery
Advisor can report on and repair failures such as inaccessible files, physical and
logical block corruptions, and I/O failures. Every failure has a failure priority:
CRITICAL, HIGH, or LOW. Every failure also has a failure status of OPEN or
CLOSED.
You can also use Data Recovery Advisor to view repair options. A repair is an action
that fixes one or more failures. Examples of repairs include block media recovery, data
file media recovery, and Oracle Flashback Database. Typically, Data Recovery Advisor
presents both automated and manual repair options. If appropriate, you can choose an
automated repair option in order to perform a repair. In this case, Data Recovery
Advisor verifies the repair success, and closes the relevant repaired failures.
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