DBCC FREESYSTEMCACHE('SQL Plans');

DBCC FREEPROCCACHE

SELECT TOP 1 type, name, pages_kb FROM sys.dm_os_memory_clerks ORDER BY pages_kb  desc

type    name    pages_kb
CACHESTORE_SQLCP    SQL Plans   38321048

SELECT COUNT(*) FROM sys.dm_exec_query_stats WITH (NOLOCK)