OCP更换题库，052最新题库及答案整理-第19题
Oracle认证考试含金量不小，不少人打算考认证，但是最近Oracle对OCP认证考试做了调整，加大了考试难度，不但考试形式变化了，而且还不断的有新题加入，这些变化让很多想考OCP的同学犹豫不决，这里收集了一些052新的考题，帮助大家顺利拿下OCP认证。
19、Which is true about invalid PL/SQL objects?
A) They are automatically recompiled against the new definition of a referenced object at the same time as the referenced object is modified.
B) They can be manually recompiled only by using SQL commands.
C) They are automatically recompiled against the new definition of a referenced object when they are called.
D) They must be manually recompiled before they can be used if a DDL is performed on a table that is referenced in the PL/SQL object.
Answer:D
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