What is Data Protection Mode

 When you configure the standby database, you need to determine the level of data loss that is acceptable to the bussiness. Oracle data guard offers three different mode.
 1) Maximum Protection
 2) Maximum availability
 3) Maximum Performance

Maximum Protection:

 In Maximum Protection(or "no data loss") mode, at least one standby location must be written to before a transaction commits in the primary database.if standby database log shipping not available then primary shutdown.

Maximum availability:

 In Maximum availability mode, at least one standby location must be written to before a transaction commits in the primary database.if standby database log shipping not available then primary does not shotdown.when the fault is corrected, the redo generated since the fault is transported and applied to the standby.

Maximum Performance

 It is the default mode, In this mode transaction can commit before their redo information is sent to the standby location. Commits in the primary database occor as soon as writes to the local online redo logs complete.

 Once you have decided on the type of standby and data protection mode for your envirnment, you can create your standby database.