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？（） 

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

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

单项选择题View the Exhibit and examine the properties of the TT tablespace.  Using Database Control， you have scheduled a job to shrink the TRANS table residing on the TT tablespace. The job would run at 5：00 p.m. every Friday.When you examine the space usage of the table after the completion of the job， you find that the table has not been shrunk.  What could have been the reason for this？（）

A.The tablespace that contains the TRANS table is online.
B.The tablespace that contains the TRANS table is permanent.
C.The tablespace that contains the TRANS table is locally managed.
D.The segment space management of the tablespace that contains the TRANS table is manual in nature.