e/s logical and physical i/o with regard to the use of the processor

Hi guys,.

I understand that

LIO = logical cache buffers. LIO peut incurred a PIO in order to get in the first place in the cache.

PIO = physical disk read

I understand that the physical i/o reads disc causing increase of disk IO and translate into long elapsed time.

My question is if pure LIOs (read data detected in the cache, memory) or physical IOs will consume more cpu?

I'm just curious about whether an increase in cpu high ulization is due to the high number of physical i/o, maybe due to lack of ram allocated to the db or more to the high number of pure LIOs (memory enough to cache the data, very less PIO).

Thank you

It is not either / or.

The call for an e/s also requires the use of the cpu. So an IOP will use more cpu, but it will be spread over a longer time waiting for i/o. between the copy of things about the SGA and all locks and mutexes involved, it becomes a complex interaction. So the best approach is simply to minimize LIO, since this will drive pio sometimes, and with all the other current stuff, it is often the largest amount of work to reduce. Then, if you do not see the paradoxical effects of modification of the allocation of bottlenecks, you can work on those if you need to.

Remember, the copy to give you your own copy of block for the lio and all the other stuff takes cpu.

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