DbTxn::discard()
Prev | Chapter 13. The DbTxn Handle | Next

## DbTxn::discard()

    #include <db_cxx.h>

    int
    DbTxn::discard(u_int32_t flags);

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

The `DbTxn::discard()` 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.

After `DbTxn::discard()` has been called, regardless of its return, the DbTxn handle may not be accessed again.

### Parameters

#### flags

The flags parameter is currently unused, and must be set to 0.

### Errors

The `DbTxn::discard()` 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:

#### EINVAL

If the transaction handle does not refer to a transaction that was recovered into a prepared but not yet completed state; or if an invalid flag value or parameter was specified.

### Class

DbEnv, DbTxn

### See Also

Transaction Subsystem and Related Methods

Prev | Up | Next
DbTxn::commit() | Home | DbTxn::get_name()