Standby Database 
A standby database is a copy of the active database. To update the standby database, you import the log backups of the original database. The standby database always is in ADMIN operational state.
If the original database breaks down, you can start the standby database immediately, thereby continuing work without long downtimes. You can also revert the standby database to the state the original database was in at an earlier point in time.
Procedure
Original Database and Standby Database
To set up and manage standby databases, use Database Studio or Database Manager CLI.
Create the standby database by creating a copy of your original database. Proceed as described in the Database Copy section, while observing the following:
Set up the original database and the standby database on different computers.
Use the same version of the database software for both the original and the standby database.
Configure separate working directories for the databases.
Use the same values for the database parameters for both databases.
Do not start the standby database; instead, leave it in the ADMIN operational state.
In the standby database, define a backup template for log backups with the following property:
Data Carrier (device/file) points to the log backup of the original database.
More information:
Database Studio, Defining Backup Templates
Database Administration in CCMS, Backup Templates
In your original database, regularly create log backups.
More information:
Database Studio, Backing up Log Entries
Database Administration in CCMS, Scheduling Log Backups
In the standby database, regularly import the log backups of the original database, thus updating the standby database.
More information:
Database Studio, Restoring Databases
Result
The standby database now contains the same data as the original database at the time the log backup which was last imported was created in the original database.
You can activate the standby database at any time.
More information: Making the Standby Database the Active Database
More Information
Database Manager CLI Tutorial, Setting Up and Updating Standby Databases