The CPU Cost of a DB2 I/O >Using the previous examples >The average CPU time for a 0% hit ratio was 157us for 18 fetches That equates to 2826us for all fetches >The average CPU time for a 100% hit ratio was 41us for 18 fetches That equates to 738us for all fetches >Physical IO occurred for the 0% hit ratio 21 synchronous reads/89 prefetch reads –Charged to the application/DB2
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