The configuration of the online redo log files is as follows:

A: The LGWR process concurrently writes the redo log entries to both the members of a group.
B: When a member of a group becomes corrupt, the database crashes.
C: The sizes of the redo01a.log and redo01b.log online redo log members of group Group1 can be different.
D: When redo02a.log and redo02b.log files become corrupt, then the database operations will proceed as normal.
出自:Oracle认证