【OCP最新題庫解析(052)–題42】 which is true about invalid PL/SQL
- 2019 年 10 月 11 日
- 筆記
註:OCP-052最新題庫完整詳細解答版請聯繫小麥苗私聊。解題不易,請大家尊重原創。
題目
which is true about invalid PL/SQL objects?
A. They are automatically recompiled against the new definition of a referenced object when they are called.
B. 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.
C. They are automatically recompiled against the new definition of a referenced object at the same time as the referenced object is modified.
D. They can be manually recompiled only by using SQL commands.
A
答案
Answer:A
失效的PL/SQL對象在下一次執行時會自動進行編譯操作,排除B、C和D。
實驗如下:
LHR@OCPLHR1> create table test_ddl(id number); Table created. LHR@OCPLHR1> create or replace procedure pro_test_ddl as begin insert into test_ddl(id) values(1);commit; end; 2 / Procedure created. LHR@OCPLHR1> show errors No errors. LHR@OCPLHR1> select status from user_objects where object_name='PRO_TEST_DDL'; STATUS ------- VALID LHR@OCPLHR1> alter table test_ddl add name varchar2(10); Table altered. LHR@OCPLHR1> select status from user_objects where object_name='PRO_TEST_DDL'; STATUS ------- VALID LHR@OCPLHR1> alter table test_ddl drop column id; Table altered. LHR@OCPLHR1> select status from user_objects where object_name='PRO_TEST_DDL'; STATUS ------- INVALID LHR@OCPLHR1> alter table test_ddl add id number; Table altered. LHR@OCPLHR1> select status from user_objects where object_name='PRO_TEST_DDL'; STATUS ------- INVALID LHR@OCPLHR1> exec PRO_TEST_DDL; PL/SQL procedure successfully completed. LHR@OCPLHR1> select status from user_objects where object_name='PRO_TEST_DDL'; STATUS ------- VALID
About Me:小麥苗
● 本文作者:小麥苗,只專註於資料庫的技術,更注重技術的運用
● 作者部落格地址:http://blog.itpub.net/26736162/abstract/1/
● 本系列題目來源於作者的學習筆記,部分整理自網路,若有侵權或不當之處還請諒解
● 版權所有,歡迎分享本文,轉載請保留出處
● 題目解答若有不當之處,還望各位朋友批評指正,共同進步