4087x -

These records allow system administrators and performance analysts to:

: Tools like MXG use these identifiers to convert raw mainframe log data into readable reports for capacity planning. formats.sas.txt - Merrill Consultants

Specifically, is the identifier for a Checkpoint ADSC (Active Dataset Control) record. This record is part of the system's logging mechanism that tracks the state of active datasets during a checkpoint process. Functional Role in Mainframe Systems

Within the Merrill Consultants documentation for VMAC28 (a format for processing IMS log records), it is categorized alongside other system checkpoint markers such as: : Checkpoint DMCB/DMAC '4085'X : Checkpoint MTO Buffer '4086'X : Checkpoint DMHR/DEDB '4087'X : Checkpoint ADSC