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.indexorganized table （IOT）
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相关考题
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单项选择题
Whiledesigningyourdatabase，youhavecreatedtheEMPLOYEEStableasanindexorganizedtable（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.indexorganized tables （IOTs） -
多项选择题
View the Exhibit and examine the properties of the USERS tablespace. You execute the following statement to shrink the TRANS table existing on the USERS tablespace： SQL> ALTER TABLE trans SHRINK SPACE CASCADE Which objects would be affected by this command？ （）
A.the TRANS table
B.the B*Tree indexes on the TRANS table
C.the materialized views log of the TRANS table
D.the materialized views based on the TRANS table
E.the large object （LOB） segments of the TRANS table
