Defining the log of logs

The log of logs is an MVS log stream created by CICS® TS that contains records that are written each time a file is opened or closed.

At file-open time, a tie-up record is written that identifies the following:
  • The name of the file
  • Underlying VSAM data set name
  • Forward recovery log stream name
  • CICS region that performed the file open
At file-close time, a tie-up record is written that identifies the following:
  • The name of the file
  • CICS region that performed the file close

The log of logs helps CICS VR maintain an index of log data sets. CICS VR scans the log of logs and saves information needed for recovery in the RCDS.

Define a log-of-logs log stream that is shared among all CICS regions in the Parallel Sysplex®. This must be explicitly defined, because CICS does not support model log streams for dynamic creation of this log stream. Also define a journal model resource definition that references the log-of-logs log stream.

For more information about logging in CICS Transaction Server, see CICS System Definition Guide.