If you want to understand more about "pruneatage" DSS.
Certain rules such as classes, field values, properties, property-alias, etc. are saved in the Conclusion cache. These rules are not saved in Rule cache and the rules also do not require assembly or compilation. This cache is , saved in the database table named pr4_rule_sysgen.It groups similar rules, hence searching is quicker even by accessing the database. The most common example is Field Value, (one conclusion for all locale values) conclusion cache contains only the bare minimum information needed to run the rule. This cache also uses memory caching, the metadata information about these rules are stored in memory.
The conclusion cache can be viewed in SMA in the Advanced category. The Conclusion cache page lists the details of each cache across rule categories (property, class, field value, etc.), it lists the size estimate, instance count, prune age, etc. It also lists options to clear cache for both memory and database. Clearing this cache has an adverse effect and hence should not be done.
Starting in PRPC v6.2, the conclusion cache parameters were externalized and can now be overridden using dynamic system settings. The following table shows the default values. To override these values, we should use the following as the setting purpose defined as:
prconfig/conclusioncache/typeName/minimumsize (typeName = Property or any others in the list) prconfig/conclusioncahe/typeName/pruneatage (value entered in second)