Memory constraint is one of the key reasons for under-utilized processing power.
内存约束是处理能力利用率低下的主要原因之一。
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P. S. - If you are interested in memory, you may also want to see my earlier series on 5 Key Paths to Improving memory as well as my podcast with Fiona McPherson from About memory.
Also keep in mind that on AIX, there is approximately a Max of 250mb of private virtual memory for index key sorting in LOAD (this is a memory bottleneck).