#include <db.h> int DB_TXN->set_priority(DB_TXN *tid, u_int32_t priority);
         The DB_TXN->set_priority() method sets the
         priority for the transaction. The deadlock detector will reject
         lock requests from lower priority transactions before those from
         higher priority transactions.
    
By default, all transactions are created with a priority of 100.
         The DB_TXN->set_priority() method may be
         called at any time during the life of the transaction.
    
         The DB_TXN->set_priority() 
            
                  method returns a non-zero error value on failure and 0 on success.
            
            
        
    
             The DB_TXN->set_priority() 
            
                 method may fail and return one of the following non-zero errors: