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【单选题】

Which phrase best describes RMAN multiplexed backup sets?()

A、Stripes a single backup set across multiple channels.

B、Identical copies of backup pieces within a backup set.

C、Multiple backup sets with multiple channels configured.

D、Simultaneous reads from multiple files and writes into the same backup piece.

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第2题

A、 The pages to and from paging space per second  B、 The page intervals and page operations per second  C、 The page interrupts and page operations per second  D、 The page segments transferred between pi and po devices per second  

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第6题

A、 The iostat can only be run as the root user  B、 There could be zero percent I/O wait and still be an I/O bottleneck  C、 Any I/O wait time displayed in output of "iostat" is an indication of severe I/O bottlenecks   D、 Running "iostat" without any arguments/parameters is sufficient for resolving I/O bottlenecks  

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