DB Monitor reports
These topics describe the DB-Monitor reports and how to use them.
VSAM-Buffer-Pool report
The VSAM-Buffer-Pool report gives you processing information about a specific VSAM subpool. One report is produced for each subpool you specify.
VSAM-Statistics report
VSAM-Statistics reports are based on: a specific application program PCB, a data set the application program is using, and the type of DL/I call the application program issued.
Database-Buffer-Pool report
The Database-Buffer-Pool report gives you information about OSAM subpools during processing. One report is produced for all subpools in the buffer pool.
Program-I/O report
The Program-I/O report tells how long IMS was inactive (no IMS code was being executed) because IMS was waiting for use of a resource or for completion of an event. This time is called IWAIT time and, for all practical purposes, can be considered the time IMS had to wait while an I/O operation took place.
DL/I-Call-Summary report
One DL/I-Call-Summary report is produced each time the DB Monitor is run, and the report describes times by PCB name and type of DL/I call.
Distribution-Appendix report
Use a Distribution-Appendix report when you suspect some unusual combination of events has occurred, and the times or totals on the Program-I/O or DL/I-Call-Summary report do not give you enough information to highlight the problem.
Monitor-Overhead report
This report describes the overhead required to run the DB Monitor. Because the DB monitor runs while IMS is executing, the monitor's use of resources causes the performance to be slightly less than it is when the monitor is not on.
Parent topic:
Using IMS reports
Related concepts
Monitoring VSAM buffers