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Jack Vamvas's Blog

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    SQL Server Latency

    Latency is the time delay measure in the system. SQL Server can only be as fast as the slowest component in the system. Database servers are particularly sensitive to disk IO speeds. For example, introducing an SVC system may speed up writes, but will add a cost to Reads. Latency is about benchm......

    Jack Vamvas  Posted on Dec 7 2011 12:00AM
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    SQL Dirty Pages

    Lazy writing , eager writing and checkpoint use asynchronous IO in writing pages to disk.  The purpose of  asynchronous IO is to release resources and  for other tasks to progress. i.e releases the thread to allow further threads.Usually this takes less than 10 ms – but under circ......

    Jack Vamvas  Posted on Nov 28 2011 12:00AM
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    SQL Server – RAID levels overview

    SQL server typically implements Level: 0, 1 & 5 RAID levels RAID 5 – blocks striped & distributed parity. Very widely used strategy and is a variation of RAID 3 (see below).Striping and parity are used – striping is the data placement across multiple drives. Parity is fault to......

    Jack Vamvas  Posted on Feb 24 2011 7:27AM
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