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What is NOLock

Posted By :shankey     Posted Date :July 31, 2011    Points :40   Category :Others 
Use of NOLOCK is generally a good practice on a busy system. Using nolock can return dirty data as there may be some commands that were updating the data exactly when the data is being readed.

You can also find related Interview Question to What is NOLock  below: 

Why NoLock is used in Sql Select Query?

applying nolock in select statement will increase
concurreny and performance in fetching.

it does'nt consider the transaction scenario, even if the
transaction is under process not yet commited or rollback
it will fetch the current record

begin tran
insert into tablename

select * from tablename with (nolock)

-- it will display the table with inserted record.
but the transaction is not completed, it can be rollback
so it became dirty read.


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