单项选择题
ORACLE RDBMS is a distributed DBMS. Which of the following techniques adapted ensure atomicity of distributed transaction()
A.remote procedure call (RPC) B.Two _phases commit (2PC) C.Snapshots D.triggers
A.语法、原语与数据 B.语义、数据与软件 C.层次、接口与原语 D.语法、语义与时序
A.明确的需求定义 B.完整的生命周期 C.较长的开发时间 D.熟练的开发人员