Which two statements regarding unusable indexes are correct?

Which two statements regarding unusable indexes are correct? (Choose two.)

Which two statements regarding unusable indexes are correct? (Choose two.)

A.
You can set SKIP_UNUSABLE_INDEXES to true to skip unusable indexes.

B.
You do not need to set any parameter because unusable indexes are skipped
automatically.

C.
Your Data Definition Language (DDL) statement shows a warning message when an
index is made unusable.

D.
You can check the alert log file to get a message recorded about unusable indexes.

Explanation:



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