When you restart or recover the database, the required log entries are imported automatically, to restore the last state of the database instance (see also Log Concept).
The redo log manager ensures that the required log entries are made available and processed in the correct chronological sequence.
· For each transaction, the available redo log entries are stored by the log reader in a redo log file.
· Transactions for which a redo is actually required are stored by the log reader in a redo list.
· The redo tasks evaluate the redo list, and import the required redo and undo log entries for each transaction they find.
See also Example: Restart