#include <db.h>

int
DB_TXN->discard(DB_TXN *tid, u_int32_t flags);  

The DB_TXN->discard() method frees up all the per-process resources associated with the specified DB_TXN handle, neither committing nor aborting the transaction. This call may be used only after calls to DB_ENV->txn_recover() when there are multiple global transaction managers recovering transactions in a single Berkeley DB environment. Any transactions returned by DB_ENV->txn_recover() that are not handled by the current global transaction manager should be discarded using DB_TXN->discard().

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

After DB_TXN->discard() has been called, regardless of its return, the DB_TXN handle may not be accessed again.