SQL Server Lock On tables

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SQL-Server-2008

Dear Friends,

I am in a confusion that whether SQL Server 2008 makes lock on tables during insertion,deletion, update and selection on its own OR we have to place lock on tables on which we are performing the DML operations.

As I have to insert data into the table and at the same time I have to fetch the serial no of the same record for updating the other table on the basis of that table.

And also please let me know that what lock must be put on the table during insertion.

Thanks

Varun Sareen

Posted 20-Apr-11 23:26pm

Varun Sareen

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4 solutions

Solution 1

Hi varun,

Do you want the serial number before insertion of record or after the insertion of the record.

you can get the serial number once record is inserted successfully.

Posted 21-Apr-11 0:31am

SanjeevSingh

Solution 3

if you just want to fetch the serial number and if you have that
identity

Serial Number  int identity(1,1))

  //you can try this 

INSERT INTO tbl1(val1, val2, val3 ...) VALUES(@val1, @val2, @val3...); 
SELECT SCOPE_IDENTITY();

For Lock try this Link

ClickHere[^]

Posted 21-Apr-11 2:25am

Mahendra.p25

Updated 21-Apr-11 2:28am

v2

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RDBurmon · Accepted Answer · 2011-04-21T02:07:00

Solution 2

Yes Sql server 2008 place a lock on a table during CRUD operation (Insert , Select , Update , Delete) by its own.

but As per my knowledge you should be fine with your flow.

Posted 21-Apr-11 2:07am

RDBurmon

mhwasim · Accepted Answer · 2011-05-18T02:41:00

Solution 4

you do not have to place locs explicitly for Select / Insert / Update or Delete operation. SQL Server do it by itself.

But you can place (NOLOCK) while you are reading / selecting the table so that it will not effect other operations.

Thanks

Posted 18-May-11 2:41am

mhwasim