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
The flags parameter is currently unused, and must be set to 0.
The DbTxn::discard method returns EINVAL if the transaction handle does
not refer to a transaction that was recovered into a prepared but not
yet completed state.
Otherwise, 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.
The DbTxn::discard method may fail and throw an exception or return a non-zero error for the following conditions:
- An invalid flag value or parameter was specified.
The transaction handle does not refer to a transaction that was
recovered into a prepared but not yet completed state.
The DbTxn::discard method may fail and throw an exception or return a non-zero error for errors specified for other Berkeley DB and C library or system methods.
If a catastrophic error has occurred, the DbTxn::discard method may fail and
either return DB_RUNRECOVERY or throw a
in which case all subsequent Berkeley DB calls will fail in the same way.
Transaction Subsystem and Related Methods
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