You detected an unrecoverable archive gap in your data guard environment. So, you need to roll standby. forward in time without applying a large…

The RECOVER STANDBY DATABASE FROM SERVICE command in RMAN is designed to automate

various steps required to recover the standby database, especially when dealing with an archive gap.

When this command is executed, the following actions can occur automatically:

Remember all data file names on the standby (1): RMAN has the capability to recall the names and

paths of all data files associated with the standby database.

Restart standby in nomount (2): The standby database can be automatically restarted in the

NOMOUNT state, allowing recovery operations to proceed without the database being open.

Restore controlfile from primary (3): RMAN can restore the control file from the primary database to

the standby system, ensuring that the standby has the most up-to-date control file.

Mount standby database (4): After restoring the control file, the standby database is mounted to

prepare for data file recovery.

Rename data files from stored standby names (5): Not typically done automatically by this command.

Restore new data files to new names (6): New data files added to the primary since the last

synchronization can be restored to the standby with their correct names.

Recover standby (7): Finally, RMAN will apply any necessary redo logs to bring the standby database

up to date with the primary.

While some steps, such as renaming data files (5), typically require manual intervention or scripting,

most of the recovery process can be handled by RMAN automatically, streamlining the recovery of

the standby database.

Reference:

Oracle Database Backup and Recovery User's Guide

Oracle Data Guard Concepts and Administration Guide