If your application frequently accesses smaller tables without proper indexes, the database will load them into memory each time and scan them.
如果应用程序频繁地访问没有适当索引的小表,数据库每次都会把它们装载进内存并扫描它们。
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For the study, researchers did memory and brain scan tests on 85 people with mild cognitive impairment who were part of the larger Alzheimer's Disease Neuroimaging Initiative study.
Because the page replacement algorithm is always looking for free frames while it is doing its scanning on systems with a lot of memory, the number of frames to scan can be significant.