There are several client application issues to consider before you set up warm standby databases.
Depending on your client applications and your method of initializing the standby database, you may be suspending transaction processing in the active database until you have initialized the standby database.
If you do not suspend transaction processing, ensure that Replication Server has sufficient stable queue space to hold the transactions that execute while you are loading data into the standby database.
Before you set up the warm standby databases, implement a mechanism for switching client applications to the new active database.