Berkeley DB

DbTxn::prepare

						#include <db_cxx.h>
						int
						DbTxn::prepare();
					

Description

The DbTxn::prepare method initiates the beginning of a two-phase commit.

In a distributed transaction environment, Berkeley DB can be used as a local transaction manager. In this case, the distributed transaction manager must send prepare messages to each local manager. The local manager must then issue a DbTxn::prepare and await its successful return before responding to the distributed transaction manager. Only after the distributed transaction manager receives successful responses from all of its prepare messages should it issue any commit messages.

In the case of nested transactions, preparing a parent transaction causes all unresolved children of the parent transaction ...