Deficiencies
The Vue language lacks aggregations and instead uses a list data type that offers similar yet limited functionality. The equivalent product from Solaris called DTrace offers an aggregation data type and a powerful set of aggregating functions to represent statistical data. The list data type offers only basic aggregating functions on a single item (as opposed to an associative arrays of aggregations that DTrace offers). The list data type offers a slight simplification over keeping the stats manually but does not allow the list to be reset (say, over an interval) that can easily be done when using manual summaries and basic types. IBM has committed to associative arrays on future versions of the Vue language.
Because of the long development lead time DTrace has over ProbeVue, DTrace has considerably more probe point specifications. IBM has plans to add a considerable number of new probe points in future technology level releases of AIX 6.1 and in the next major AIX release.
Read more about this topic: Probe Vue