#include <db_cxx.h> int DbEnv::memp_trickle(int percent, int *nwrotep);
         The DbEnv::memp_trickle() method ensures that a specified percent of
         the pages in the cache are clean, by writing dirty pages
         to their backing files.
    
         The purpose of the DbEnv::memp_trickle() function is to enable a
         memory pool manager to ensure that a page is always available for
         reading in new information without having to wait for a write.
    
         The DbEnv::memp_trickle() 
            
            
                method either returns a non-zero error value or throws an
                exception that encapsulates a non-zero error value on
                failure, and returns 0 on success.
            
        
    
                         The DbEnv::memp_trickle() 
            
            
                method may fail and throw a DbException 
                exception, encapsulating one of the following non-zero errors, or return one
                of the following non-zero errors:
            
        
                         following non-zero errors: