sp_sysmon can give you information about Adaptive Server system behavior both before and after tuning. It is important to study the entire report to understand the full impact of the changes you make. Sometimes removing one performance bottleneck reveals another.
It is also possible that your tuning efforts might improve performance in one area, while actually causing performance degradation in another area.
In addition to pointing out areas for tuning work, sp_sysmon output is valuable for determining when further tuning will not pay off in additional performance gains.
It is just as important to know when to stop tuning Adaptive Server, or when the problem resides elsewhere, as it is to know what to tune.
Other information can contribute to interpreting sp_sysmon output:
Information on the configuration parameters in use, from sp_configure or the configuration file
Information on the cache configuration and cache bindings, from sp_cacheconfig and sp_helpcache
Information on disk devices, segments, and the objects stored on them
