4. Which three statements are true about the stages of database startup? (Choose three.)
A) Data files and redo log files can be renamed at the MOUNT stage.
B) Control files are read at the OPEN stage for the location of data files.
C) Control files are required to bring the database to the NOMOUNT stage.
D) Data files and redo log files are made available to users at the OPEN stage.
E) Data files and online redo log files are checked for consistency while opening the database
ADE
5. A constraint in a table is defined with the INITIALLY IMMEDIATE clause. You executed the ALTER TABLE
command with the ENABLE VALIDATE option to enable the constraint that was disabled. What are the two
effects of this command? (Choose two.)
A) It fails if any existing row violates the constraint.
B) It does not validate the existing data in the table.
C) It enables the constraint to be enforced at the end of each transaction.
D) It prevents insert, update, and delete operations on the table while the constraint is in the process of being enabled.
AD
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这咋说啊，oracle就是那样的，记住就可以了啊
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哦,每天一贴
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不错,学习!
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支持
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哦，upup
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ok,学习