【oracle】oracledba5 A mapping table must have been created.，oracledba5mapping
While designing your database, you have created the EMPLOYEES tab
le as an index-organized (IOT). You want to create a bitmap index on
the JOD_ID column to make queries faster. Which task must have been c
ompleted 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.
Answer: B
当设计您的数据库，您已经创建了员工表乐作为一个索引组织（IOT）。你想创建一个位图索引为了使查询速度更快的jod_id列。这任务必须是完成，以便你能创建位图索引？
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