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is there some way to tell sql server to use the (nolock) hint or every select in a stored procedure?
is pretty tiresome to add it to each an every select....
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The NOLOCK hint allows SQL to read data from tables by ignoring any locks and therefore not get blocked by other processes. This can improve query performance by removing the blocks, but introduces the possibility of dirty reads.
TT. WITH (NOLOCK) is not deprecated for SELECT queries.
Thus, we can say that Nolock reads “Dirty Data” when applied with only Select statement in SQL Server Database. While With (Nolock)do not issue any shared locks and exclusive locks. It is possible with With (Nolock) that, it can read an uncommitted transaction, which can be rolled back at the middle of a read.
As others quite rightly say, a global (nolock) is done using READ UNCOMMITTED.
However, before going down that route, it's worth trying READ COMMITTED SNAPSHOT first. This means your reads won't be locked by in progress inserts / updates and means that the data isn't dirty, just out of date.
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You want to use the following syntax:
SET TRANSACTION ISOLATION LEVEL READ UNCOMMITTED
I found this by looking at the NOLOCK table hint located here. The WITH(NOLOCK) table hint is equivalent to setting the isolation level to be READ UNCOMMITTED. Here's the snippet from MSDN:
NOLOCK Is equivalent to READUNCOMMITTED. For more information, see READUNCOMMITTED later in this topic.
30
I think this is what you are looking for...
SET TRANSACTION ISOLATION LEVEL READ UNCOMMITTED
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