单项选择题
While designing your database， you have created the EMPLOYEES table as an index-organized 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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相关考题
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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
