System monitoring

The System class records for each interval and for each monitored database:

- the DB2 system counters as shown by the DB2/VM COUNTER command (Sample Report)
- the counters for the DB2 lock subsystem (Sample Report)
- the counters for the I/O subsystem (Sample Report)
- statistics obtained from VM/ESA, such as the CPU utilization and paging rate in the database servers (Sample Report)
- the SQL/MF "extended counters" (Sample Report)