1.Maximum protection mode : By configuring data guard in maximum protection mode, we can achieve no data loss solution.
In this mode we need to create standby redologs.
In this mode user gets commit complete acknowledgement, once the data has been written to primary redologs as well as standby redologs(there will be slight performance impact).
Note : If primary is unable to ship the data to atleast one standby, primary goes down automatically.
Recommanded to configure in this mode for financial domains(banking,insurance etc).
2.Maximum performance mode : In this mode , not necessary to create standby redologs.
User gets commit complete acknowledgement once the data has been written to primary redologs.
This mode gives better performance but there are some chances to loose the transactional data.
3.Maximum availability mode : In this mode, initially configuration works in maximum protection mode, if primary is unable to ship the data to standby, primary will not go down and configuration automatically works in maximum performance mode.
