#include <db.h> int DB_ENV->log_printf(DB_ENV *env, DB_TXN *txnid, const char *fmt, ...);
         The DB_ENV->log_printf() method appends an informational message to
         the Berkeley DB database environment log files.
    
         The DB_ENV->log_printf() method allows applications to include
         information in the database environment log files, for later review
         using the db_printlog
         utility.  This method is intended for debugging and performance
         tuning.
    
         The DB_ENV->log_printf() 
            
                  method returns a non-zero error value on failure and 0 on success.
            
            
        
    
If the logged message refers to an application-specified transaction, the txnid parameter is a transaction handle returned from DB_ENV->txn_begin(); otherwise NULL.
                         The DB_ENV->log_printf() 
            
                 method may fail and return one of the following non-zero errors: