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It depends a little on what storage system you have behind the scenes. You see, read and write IO operations are very different. On a RAID 5 to perform a single block write you must: Read the update block. Read the parity block. Write the new block. Write the new parity block. So for a single random write, RAID 5 needs 4 operations per write. This is ...


5

There are two types of activity to consider here: reads and writes. As you correctly point out, MDF/NDF writes are done through the checkpoint process, and users shouldn't have their transaction time affected. Reads happen when the data that is needed is not yet in RAM (in the buffer cache). So ideally, user activity shouldn't be affected often. But when ...



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