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Exam 1z0-071 topic 1 question 170 discussion

Actual exam question from Oracle's 1z0-071
Question #: 170
Topic #: 1
[All 1z0-071 Questions]

Which two statements are true about indexes and their administration in an Oracle database? (Choose two.)

  • A. A new index can be created or an existing one reused when a primary key constraint is created.
  • B. An INVINSIBLE index is maintained by DML operations on the underlying table.
  • C. If a query filters on an indexed column, the index will always be accessed during execution of the query.
  • D. A DROP INDEX statement always prevents updates to the table during the drop operation.
  • E. The same table column cannot be part of a unique and non-unique index.
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Suggested Answer: AB 🗳️
by Darnun at March 29, 2023, 3:29 p.m.

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lucemqy
1 month, 3 weeks ago
Selected Answer: AB
AB is correct
upvoted 1 times
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jm9999
3 months, 2 weeks ago
Selected Answer: AC
A: using index clause C: once index created, use is automatic with query
upvoted 1 times
jm9999
3 months, 1 week ago
Zouve's comments regarding choice C are absolutely correct. My mistake! AB
upvoted 1 times
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zouve
6 months, 1 week ago
Selected Answer: AB
c. No, that statement is not necessarily true. If a query filters on an indexed column, the optimizer will decide whether or not to use the index based on factors such as the selectivity of the filter and the size of the table. In some cases, a full table scan may be more efficient than using an index.
upvoted 2 times
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Darnun
9 months, 2 weeks ago
Selected Answer: AB
AB are correct
upvoted 1 times
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Darnun
9 months, 2 weeks ago
https://www.examtopics.com/discussions/oracle/view/9439-exam-1z0-071-topic-1-question-300-discussion/
upvoted 1 times
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