- 搜標(biāo)題
- 搜題干
- 搜選項
多項選擇題
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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