What is WITH CHECK OPTION

Question Posted / kiran

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What is WITH CHECK OPTION..

Answer / guest

When you use this option to create a view with a where
condition, the system wont allow to perform any action which
will invalidate the definition of the view.

ex:
create view test
as
select firstname,lastname from Employees where sal<10000
with Check option

If this returns 10 rows when you are updating the view if
any action is being done which updates the sal so that the
view returns lesser number of records is not allowed.

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What is WITH CHECK OPTION..

Answer / sanjeev kumar

CREATE VIEW Authorsview
AS
SELECT au_id, au_fname, au_lname, phone, state, contract
FROM authors
WHERE state = 'ca'

This is an updatable view and a user can change any column value
like:
UPDATE Authorsview SET state='NY'

Example: but when we create With Check Option then Same as
above but the state column cannot be changed.

CREATE VIEW Authorsview
AS
SELECT au_id, au_fname, au_lname, phone, state, contract
FROM authors
WHERE state = 'ca'
With Check Option

The view is still updatable, except for the state column:

UPDATE Authorsview SET state='NY'

This will cause an error and the state will not be changed
because we have use check option with state.

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What is WITH CHECK OPTION..

Answer / naren

The CHECKPOINT statement saves time in a subsequent
recovery by creating a point at which all modifications to
data and log pages are guaranteed to have been written to
disk.

Checkpoints also occur:

When a database option is changed with ALTER DATABASE. A
checkpoint is executed in the database in which the option
is changed.

When a server is stopped, a checkpoint is executed in each
database on the server. These methods of stopping Microsoft
SQL Server 2000 checkpoint each database

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