#include <db.h>

int
DB_ENV->get_data_len(DB_ENV *dbenv, u_int32_t *bytes);  

The DB_ENV->get_data_len() method returns the maximum number of bytes to display for each key/data item when dumping the database or printing the log. This limit can be set using the DB_ENV->set_data_len() method.

The DB_ENV->get_data_len() method may be called at any time during the life of the application.

The DB_ENV->get_data_len() method returns a non-zero error value on failure and 0 on success.