Making the Standby Database the Active Database 
Prerequisites
You have set up a standby database.
More information: Standby Database
The standby database has not been in the ONLINE operational state since it was last initialized.
Procedure
In the original database, perform a log backup (if still possible).
More information:
Database Studio, Backing up Log Entries
Database Administration in CCMS, Scheduling Log Backups
If you have problems with the original database and can no longer perform log backups, there are other ways to copy the most recent log entries for the original database into the standby database.
More information: Database Manager CLI Tutorial, Copying Log Volumes with Operating System Commands and Starting a Standby Database as the Active Database
In the standby database, import all the log backups from the original database that have not been imported yet.
More information:
Database Studio, Restoring Databases
Start the standby database.
More information:
Database Studio, Starting or Stopping Databases
Update the system tables.
More information:
Database Studio, Updating System Tables
If necessary, restore any damaged indexes.
More information:
Database Studio, Restoring a Damaged Index
Database Manager CLI, sql_recreateindex
Make a complete data backup of the standby database.
More information:
Database Studio, Backing Up Data
Database Manager CLI Tutorial, Backing Up
Result
You can now use the former standby database as your active database.
To turn the old original database into a new standby database, initialize the old original database and then proceed as described in Standby Database.
More Information
Database Manager CLI Tutorial, Starting a Standby Database as the Active Database