Using NOLOCK in SQL Statement (SQL Server 2008)

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SQL Server 2008
SQL statements
This is more a general question but a friend of mine is in the business of making websites and applications that aren't mission critical.

So with that, is it bad practice to use the NOLOCK hint in SQL Statements? He was told by an SQL administrator that he should use it if he's satisfied with a "dirty read" because you will get a better performance from your system.

Thanks!

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