You can work with summary monitors from the iSeries™ Navigator interface. A summary monitor creates a Memory-Resident Database monitor (DBMon), found on the native interface.
As the name implies, this monitor resides in memory and only retains a summary of the data collected. When the monitor is paused or ended, this data is written to a hard disk and can be analyzed. Because the monitor stores its information in memory, the performance impact to your system is minimized. However, you do lose some of the detail.