Tuesday, July 20, 2010

Difference between Delete and Truncate statement in SQL

The difference between TRUNCATE and DELETE are as follows

Truncate

Delete

De allocation of datapages

Datapages are not deallocated

Where clause cannot be used in a truncate statement

Where clause can be used in a delete statement

Truncate will not work on tables referenced by one or more FOREIGN key constraint

Delete will work

When you truncate if the table contains an identity column then the counter for that column is reset to the seed value.

Identity counter is not resetted

Less transaction log space is used

It removes one row at a time and saves an entry into the transaction log for each deleted row

Each row is not locked when truncate is used, instead a table or a page is locked

When deleted using a row lock each row in the table is locked

Truncate cannot activate a trigger for a table

Delete can activate a trigger

Sunday, May 2, 2010

Disable Maximize in WPF Window

Recently i encountered an issue regarding disabling maximize in WPF Window ,there are few ways of doing this

set ResizeMode="CanMinimize" for the window.
or
WindowStyle="None" setting this property removes maximize, minimize and close options.