What is least recently used (LRU) list?
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What is least recently used (LRU) list?
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A least recently used (LRU) list manages buffer availability for the database buffer cache. This list has two ends on which the most recently used buffers enter from one end, called the most recently used (MRU) end. As these buffers age out, they are moved towards the other end called the least recently used (LRU) end. It is at the latter end that the buffers are marked free and made available for a rewrite by a block that is being read from the disk. However, if an aging block that is moving towards the LRU end is required by a statement, it is again placed at the MRU end.
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