1z0-071 Exam Dumps | Examine this list of requirements for a sequence: 1. Name:EMP_SEQ 2. First value returned:1 3. Duplicates

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Question 96/139

Examine this list of requirements for a sequence:
1. Name:EMP_SEQ
2. First value returned:1
3. Duplicates are never permitted.
4. Provide values to be inserted into the EMPLOYEES.EMPLOYEE_ID COLUMN.
5. Reduce the chances of gaps in the values.
Which two statements will satisfy these requirements?

A. CREATE SEQUENCE emp_seq START WITH 1 INCRENENT BY 1 NOCACHE;

B. CREATE SEQUENCE emp_seq START WITH 1 INCREMENT BY 1 CYCLE;

C. CREATE SEQUENCE emp_seq NOCACHE;

D. CREATE SEQUENCE emp_seq START WITH 1 CACHE;

E. CREATE SEQUENCE emp_seq START WITH 1 INCREMENT BY 1 CACHE;

F. CREATE SEQUENCE emp_seq;

Correct Answer: A,E

* A: 'CREATE SEQUENCE emp_seq START WITH 1 INCREMENT BY 1 NOCACHE;' is correct for ensuring unique values without gaps as much as possible by not caching sequence numbers, which might otherwise be lost in a system crash.
* B: CYCLE allows the sequence to restart when its max/min value is reached, which does not help with requirement 3 (duplicates are never permitted). Therefore, B is incorrect.
* C: This lacks the necessary attributes like START WITH and INCREMENT BY which are crucial to defining a sequence. Thus, statement C is incorrect.
* D: 'CREATE SEQUENCE emp_seq START WITH 1 CACHE;' might introduce gaps due to the caching of sequence numbers. This statement is somewhat contrary to requirement 5.
* E: 'CREATE SEQUENCE emp_seq START WITH 1 INCREMENT BY 1 CACHE;' will provide continuous unique values, but may include gaps when the cache is lost due to a restart, yet it is more efficient and still generally aligns with the requirements. Hence, statement E is considered correct.
* F: This lacks detail and is too ambiguous, lacking the necessary parameters. Therefore, F is incorrect.

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