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While designing your database， you have created the EMPLOYEES table as an index/x7forganized 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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出自：Oracle认证

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