SQL Server manages when and how disk I/O is performed, but the Windows operating system performs the underlying I/O operations. The I/O subsystem includes the system bus, disk controller cards, disks, tape drives, CD-ROM drive, and many other I/O devices. Disk I/O is frequently the cause of bottlenecks in a system. Having said that SQL Server uses the specific storage ages of TEMPDB, Transaction log file and database files, whereever you see the best practice always dictate that seperating TEMPDB...(
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