When there are both data object and query caches, statistics is
QUERY_CACHE_STATISTICS (contains information about tables, data object
and query caches).
This abstract class contains data and mechanisms needed for caching data
objects (or DataStruct objects) and queries and provides cache configuration
and administration.
This class contains data and mechanisms needed for caching data objects (or
DataStruct objects) and queries and provides cache configuration and
administration.