單項選擇題

In your test database， you have created the ORDERS table as an index-organized table （IOT）. To facilitate faster querying， you have created a mapping table and a bitmap index on the ORDER_FILLED column. You observe that the query performance degrades when users perform a large volume of transactions.
While investigating the reason， you find that the mapping table segment is fragmented， leading to poor performance.
Which option would you use to defragment the mapping table without affecting the original table data？（）

A.export and import the mapping table
B.drop and re-create the mapping table
C.truncate the mapping table and reinsert the values
D.use the ALTER TABLE···REBUILD command to defragment the mapping table

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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

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.index-organized table （IOT）

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