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ENGINE_CONTROL(storage-engine, command [, arg, [, arg ...]])
Internal characteristics of storage engines may be controlled with
ENGINE_CONTROL() requests. The first argument is the name of the storage engine to be manipulated and the second argument is a storage engine-specific command. Each command may take a variable number of arguments.
|InnoDB||prefetch_pages||space, page [, page ...]|| Reads index and data pages into the buffer pool.
Returns the number of pages read.