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单项选择题You work as a database administrator for Supportcenter.cn. In your production database， the size of Database Buffer Cache needs to be increased immediately for the current as well as future instances of the database. The Oracle instance has been configured to accommodate any changes in the size of the memory structures. At this is production database， you want to accomplish this task with no impact on the user’s connections. Which activity must you have completed before accomplishing this task？（）: A、You must have started the database instance in restricted mode.; B、You must have started the database instance inNORMALmode.; C、You must have started the database instance with server parameter file.; D、You must have started the database instance but must not have mounted.; E、You must have started the database instance but must not have opened.

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