Alv verifies Oracle archive logs to ensure there is a viable set available for DB recovery. It can be run from wherever the logs are stored, so verification may be offloaded from the DB server. Checks are made on file size and type. By default, the checksum of each redo record is also verified. Program output consists of log sequence numbers and character codes which indicate status and highlight any gaps. Environment variable settings allow for custom log name formats and to check the DBNAME set within a log.