This screen presents the current values for DB Collector Data. Use transaction DBACOCKPIT, and then choose Performance → Current DB Collector Data.
To see historical data, choose Performance → History → DB Collector History.
The main screen contains five tabs to allow for various ways of viewing the collector data. There are four screens, which show fixed categories of performance counters. They are I/O, Memory, Buffer and Miscellaneous. A fifth screen is named By Category. This screen shows the snapshot of any counter category. You can choose the counter category using a list box.