ABCs of z/OS System Programming Volume 3 - IBM Redbooks

► AKP(nnn[,nnn]...)
– This specifies the activity keypoint trigger values for the DFSMStvs instances as they
appear in the TVSNAME parameter.
– AKP is the number of logging operations between keypoints.
– Activity keypointing enables DFSMStvs to delete records from the undo or shunt log
that are no longer involved in active units of recovery.
► LOG_OF_LOGS(logstream)
– This specifies the name of the log stream that is used as a log of logs.
► QTIMEOUT({nnn|300})
– This specifies the amount of time the DFSMStvs quiesce exits allow to elapse before
concluding that a quiesce event cannot be completed successfully.
► MAXLOCKS({max|0},{incr|0})
– max is the maximum number of unique lock requests that a single unit of recovery can
make; when this value is reached, the system will issue a warning message.
– incr is an increment value.
– After max is reached, each time the number of locks increases by the incr value,
another warning message is issued.
For information about these PARMLIB parameters, see z/OS MVS Initialization and Tuning
Reference, SA22-7592.
Chapter 7. DFSMS Transactional VSAM Services 437