#include <db.h>
int
DB_ENV->get_cache_max(DB_ENV *dbenv, u_int32_t *gbytesp, 
                      u_int32_t *bytesp);  
      
         The DB_ENV->get_cache_max() method returns the maximum size of the
         cache as set using the 
         DB_ENV->set_cache_max()
         method.
    
         The DB_ENV->get_cache_max() method may be called at any time during
         the life of the application.
    
         The DB_ENV->get_cache_max() 
            
                  method returns a non-zero error value on failure and 0 on success.
            
            
        
    
The gbytesp parameter references memory into which the gigabytes of memory in the cache is copied.