Consistency
- The data belonging to a savepoint represents a consistent state of the data on disk and remains so until the next savepoint operation has completed.
- Redo log entries are written to the log volumes for all changes to persistent data.
In the event of a database restart (for example, after a crash):
- the data from the last completed savepoint can be read from the data volumes,
- and the redo log entries written to the log volumes since the last savepoint can be replayed.