多选题Examine the following output： SQL SELECT index_name，status FROM dba_indexes WHERE status=’UNUSABLE’； INDEX_NAME STATUS------------------------------ ----------- EIND UNUSABLE Which two statements about the above index are true（）AIt is ignored by the query optimizer.BIt is not used while the index is being rebuilt.CThe index cannot be rebuilt， and has to be re-created.DThe index is automatically rebuilt when used the next time
多选题
Examine the following output： SQL> SELECT index_name，status FROM dba_indexes WHERE status=’UNUSABLE’； INDEX_NAME STATUS------------------------------ ----------- EIND UNUSABLE Which two statements about the above index are true（）
A
It is ignored by the query optimizer.
B
It is not used while the index is being rebuilt.
C
The index cannot be rebuilt， and has to be re-created.
D
The index is automatically rebuilt when used the next time
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