POOL NAME BYTES
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shared pool ASH buffers 67108864
因此Ash Buffer的计算公式可以修正为
Size of ASH Circular Buffer = Max [Min [ #CPUs * 2 MB, 5% of Shared Pool Size, 30MB ], _ash_size ]
如果要调整ash buffer的大小，需要修改_ash_size参数，且确保_ash_size> Min [ #CPUs * 2 MB, 5% of Shared Pool Size, 30MB ]