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Buffer Pool - Buffer Cache - Buffer Cache hit ratio (Confusion between three)

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What i know is Buffer Pool: It is a large portion in SQL Server where it is a collection of 8KB Buffers which allocates memory for data, free pages and query plan cache.so now i got a question that Buffer cache? What is Buffer Cache? does is store the required pages/plan cache to access faster than buffer pool i.e. which are used/has frequent access are stored in buffer cache.Where does the query or procedure plan cache are stored in buffer pool or buffer cache?Kindly give an answer that makes me clarity how and what gets stored in memory/buffer pool.

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