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单选题
（）are often used to organize and index the information or prices of objects.
A
Object codes
B
Bar codes
C
References
D
Notes
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单选题Advertisement is often used to _____.A
deceive customersB
increase productionC
arouse suspicionD
push the sale
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多选题The InnoDB engine has a feature known as clustered indexes. Which three statements are true about clustered indexes as used in InnoDB?（）AA primary key must exist for creation of a clustered indexBA clustered index allows fulltext searching within InnoDBCThe first unique index is always used as a clustered index and not a primary keyDA clustered index provides direct access to a page containing row dataEIf no indexes exist, a hidden clustered index is generated based on row IDsFA primary key is used as a clustered indexGA clustered index is a grouping of indexes from different tables into a global index for faster searching
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单选题This machine （）out of order very often, but now it works well.A
is used to beB
was used to beC
used to beD
was used to
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单选题A bitmap join index is defined as（）.A
An index used to join two bitmap indexes on a table.B
A bitmap index created for the join of two or more tables.C
A bitmap index created on the join of two or more indexes.D
A bitmap index created on the join of two or more indexed-organized tables.
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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
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