單項選擇題

You are designing an application for a telecom company and you have been asked to design a database table to facilitate monthly bill generation. The bill would include details of customer calls， listed in chronological order.
Which method would you follow to achieve this objective without increasing the overhead of sorting the rows？（）

A.create a hash cluster to store the data
B.create an index cluster to store the data
C.create a partitioned table to store the data
D.create a sorted hash cluster to store the data
E.create a heap table with rowid to store the data

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單項選擇題

In your datawarehousing application， you generate reports frequently. The data is static in the tables being used to generate reports. You are currently using joins， resulting in a large performance overhead. What kind of database structure would you use to reduce the response time of the query？（）

A.hash clusters
B.index clusters
C.partitioned tables
D.indexorganized table （IOT）

單項選擇題

While designing your database， you have created the EMPLOYEES table as an indexorganized table （IOT）. You want to create a bitmap index on the JOB_ID column to make queries faster. Which task must have been completed so that you are able to create the bitmap index？（）

A.A primary key must have been created.
B.A mapping table must have been created.
C.An overflow tablespace must have been specified.
D.The PCTTHRESHOLD option must have been specified.

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While designing your database， you have created the EMPLOYEES table as an index­organized table （IOT）. You want to create a bitmap index on the JOB_ID column to make queries faster. Which task must have been completed so that you are able to create the bitmap index？（）

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While designing your database， you have created the EMPLOYEES table as an indexorganized table （IOT）. You want to create a bitmap index on the JOB_ID column to make queries faster. Which task must have been completed so that you are able to create the bitmap index？（）