1z0-071 Exam Dumps | Which two statements about INVISIBLE indexes are true?

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Question 25/139

Which two statements about INVISIBLE indexes are true?

A. an INVISIBLE Index consumes no storage

B. You can only create one INVISIBLE index on the same column list

C. The query optimizer never considers INVISIBLE Indexes when determining execution plans

D. You use AlTER INDEX to make an INVISIBLE Index VISIBLE

E. All INSERT, UPDATE, and DELETE statements maintain entries in the index

Correct Answer: D,E

INVISIBLE indexes are a feature in Oracle Database 12c and later versions that allow an index to be maintained but not used by the optimizer unless explicitly hinted.
A). False. An INVISIBLE index still consumes storage space as it is maintained in the background.
B). False. There is no such restriction. You can create multiple INVISIBLE indexes on the same column list.
C). False. The optimizer can consider INVISIBLE indexes if they are hinted at in the query.
D). True. You can alter the visibility of an index using the ALTER INDEX command to make an INVISIBLE index VISIBLE.
E). True. Even though they are invisible to the optimizer by default, all DML operations such as INSERT, UPDATE, and DELETE continue to maintain the index as they would with a VISIBLE index.

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