(1) The primary and secondary log files that are currently needed for recovery and rollback.
(2) The portion of the DB2 for z/OS log to which log records are written as they are generated. The active log always contains the most recent log records.
(3) A data set with a fixed size on which WebSphere MQ records recovery events as they occur. When the active log is full, WebSphere MQ copies its contents to a data set called the archive log.