Discussion
The online redo log contains :
(i) A record of all committed transactions.
(ii) A record of all rolled back transactions.
(iii) A list of all the logged in users.
(iv) A list of all the associated files.
Answer: A
The online redo log contains (i) and (ii).
In Oracle, the online redo log records every change made to the database as redo entries, so that the changes can be reapplied in recovery. That covers transactions that were committed and also changes that were later rolled back, since the rollback is itself recorded through undo changes.
It holds no list of logged-in users, which is session information kept in memory. The list of the database's associated files (data files and redo log files) is kept in the control file, not in the redo log. So options including (iii) or (iv) are wrong.
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