单项选择题
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）
相关考题
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单项选择题
Whiledesigningyourdatabase，youhavecreatedtheEMPLOYEEStableasanindex-organizedtable（IOT）.YouwanttocreateabitmapindexontheJOB_IDcolumntomakequeriesfaster.Whichtaskmusthavebeencompletedsothatyouareabletocreatethebitmapindex？（）
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. -
单项选择题
While designing the database for one of your online transaction processing （OLTP） applications， you want to achieve the following： a） high availability of data b） faster primary key access to the table data c） compact storage for the table Which type of tables would you use to achieve these objectives？（）
A.heap tables
B.object tables
C.partitioned tables
D.index-organized tables （IOTs） -
单项选择题
In one of your online transaction processing （OLTP） applications， users are manipulating and querying a database table simultaneously. From the Segment Advisor， you find that one of the tables is highly fragmented and you want to shrink the table immediately without affecting the currently active queries. Which option would you use with the ALTER TABLE command to achieve this objective？（）
A.REBUILD
B.CASCADE
C.TRUNCATE
D.ROW MOVEMENT
E.SHRINK SPACE COMPACT
F.SHRINK SPACE CASCADE
