【oracle】oracledba5 A mapping table must have been created.,oracledba5mapping

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【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  

當設計您的資料庫,您已經建立了員工表樂作為一個索引組織(IOT)。你想建立一個位元影像索引為了使查詢速度更快的jod_id列。這任務必須是完成,以便你能建立位元影像索引?


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