Restoring a partial save

If only updated pages (partial save) were saved, the entire file is first restored, i.e. the volumes used for the last full save of the file are requested from the volume pool of the directory file and the file is restored. The volumes of the desired partial saves are then requested and the updated pages are restored.

If you are working with a directory file and specify FROM=LATEST,STATE or FROM=date.time,STATE, ARCHIVE first writes back the last full save and then the last partial save. The latter contains all the pages which have been modified in the file since the last full save.

If no directory file is being used, the user is obliged to restore in the last full save as well.