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Redundant Array of Inexpensive Disks. RAID is used for describing the configuration of multiple physical disks into one logical disk. Windows supports both hardware RAID and Software RAID. The main RAID types are as follows:
I/O in which a specific disk block is directly accessed. This is typically the I/O that results from index lookups.
The process by which SQL Server anticipates which pages a session will require, and reads them into the Buffer Cache before they are requested by the user connection. Used when SQL Server determines that a session is accessing table or index pages in a sequential manner. If the sequential processing does indeed continue, these pages will already be in the cache memory when required, thereby avoiding the need to wait for an I/O operation.
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