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NO.1 Which statements are correct regarding indexes? (Choose all that apply.)
A. Indexes should be created on columns that are frequently referenced as part of an expression.
B. A non-deferrable PRIMARY KEY or UNIQUE KEY constraint in a table automatically creates a unique
index.
C. When a table is dropped, the corresponding indexes are automatically dropped.
D. For each DML operation performed, the corresponding indexes are automatically updated.
Answer: B,C,D
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NO.2 The first DROP operation is performed on PRODUCTS table using the following command:
DROP TABLE products PURGE;
Then you performed the FLASHBACK operation by using the following command:
FLASHBACK TABLE products TO BEFORE DROP;
Which statement describes the outcome of the FLASHBACK command?
A. It is not possible to recover the table structure, data, or the related indexes.
B. It recovers only the table structure.
C. It recovers the table structure and data but not the related indexes.
D. It recovers the table structure, data, and the indexes.
Answer: A
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