The following text describes transitn.gif.

This figure shows the database state transitions that can occur on the primary and standby databases. The primary database can transition between offline and online states. When in an online state, the primary database can operate in Read/Write mode in which log transport services archive redo logs to the standby database, or in Read/Write Transport On mode in which log transport services are paused and are not archiving redo logs to the standby database.

The physical standby database also can transition between the offline and online states. When in an online state, the physical standby database can be in either a Physical Apply On state in which log apply services are applying archived redo logs, a Physical Apply Ready state in which log apply services are paused and waiting to apply archived redo logs, or in a Read-Only state. Multi-directional arrows in the figure indicate that you can transition the physical standby database from any states to any other state.

Similarly, the logical standby database can transition between the offline and online states. When in an online state, the logical standby database can be in either a Logical Apply On state in which log apply services are applying archived redo logs, or a Logical Apply Ready state in which log apply services are paused and waiting to apply archived redo logs. Multi-directional arrows in the figure indicate that you can transition the logical standby database from any states to any other state.

Table 4-1 and the text following this illustration provide more detail about database online states, substates, and state transitions.