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TRANSACTION ISOLATION LEVEL READ UNCOMMITTED
Posted on 2011-03-10
is:
SET TRANSACTION ISOLATION LEVEL READ UNCOMMITTED
the same as using
SELECT * FROM tableName WITH (NOLOCK)
SET TRANSACTION ISOLATION LEVEL READ UNCOMMITTED
the same as using
SELECT * FROM tableName WITH (NOLOCK)
[X]
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2 Comments
yes:
http://msdn.microsoft.com/en-us/library/aa259216%28v=sql.80%29.aspx
READ UNCOMMITTED
Implements dirty read, or isolation level 0 locking, which means that no shared locks are issued and no exclusive locks are honored. When this option is set, it is possible to read uncommitted or dirty data; values in the data can be changed and rows can appear or disappear in the data set before the end of the transaction. This option has the same effect as setting NOLOCK on all tables in all SELECT statements in a transaction. This is the least restrictive of the four isolation levels.
http://msdn.microsoft.com/en-us/library/aa259216%28v=sql.80%29.aspx
READ UNCOMMITTED
Implements dirty read, or isolation level 0 locking, which means that no shared locks are issued and no exclusive locks are honored. When this option is set, it is possible to read uncommitted or dirty data; values in the data can be changed and rows can appear or disappear in the data set before the end of the transaction. This option has the same effect as setting NOLOCK on all tables in all SELECT statements in a transaction. This is the least restrictive of the four isolation levels.
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