Performance

Dmitry Piliugin

SQL Server NOLOCK and Top Optimization

April 12, 2018 by

Sometimes people use nolock hint as a “turbo” button for their queries, assuming that not taking locks will speed up the query execution. There are many good articles describing all the dangerous moments of this approach, because of the read uncommitted isolation level. However, the focus of this article is a performance problem that you may encounter using nolock hint in some cases.

Let us setup some test data first.

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Milena Petrovic

SQL Server processor performance metrics – Part 3 – measures that indicate hardware component problems

March 11, 2014 by
In the Part 1 and Part 2 of the SQL Server processor performance metrics series, we described the most important processor performance metrics – Processor: % Processor Time, Process: % Processor Time, Processor Queue Length, Processor: % User Time, Processor: %Privilege Time, as well as various total times and thread metrics Read more »