This parameter allows you to set a number of switches which are each internally represented by a bit of the parameter.
Recommendation: Any switch (except dft_mon_timestamp) that is turned ON instructs the database manager to collect monitor data related to that switch. Collecting additional monitor data increases the processing time of the database manager which can impact system performance. Turning the dft_mon_timestamp switch OFF becomes important as CPU utilization approaches 100%. When this occurs, the CPU time required for issuing timestamps increases dramatically. Furthermore, if the timestamp switch is turned OFF, the overall cost of other data under monitor switch control is greatly reduced.
All monitoring applications inherit these default switch settings when the application issues its first monitoring request (for example, setting a switch, activating the event monitor, taking a snapshot). You should turn on a switch in the configuration file only if you want to collect data starting from the moment the database manager is started. (Otherwise, each monitoring application can set its own switches and the data it collects becomes relative to the time its switches are set.)