最近在搞Workflow因为几乎什么都不知道，所以决定记录下搜集的信息，我相信总有一天会因为这些只言片语茅塞顿开

1.workflow engine APIs can be called by an application program or a workflow function in the runtime phase to communicate the engine and to change each status of each activity.the pl/sql versions these APIs are defined in a pl/sql package called WF_ENGINE

2.workflow engine always issue a savepoint before executing each activity so that it can rollback to the previeous activity in case an error occurs.because of this feature you should avoid initiating a workflow process from a database trigger. because savepoint and rollback is not supported in database trigger.

if you must initiate a process from database trigger ,you must immediately defer the initial statrt activities to a background engine,so that they are no longer executing from a database trigger. to accomplish this

--set the cost of the process start activities to a value greater than the work flow engine threshold(default value 0.5)

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