Delete large amount of data in sql server

Question

Suppose that I have a table with 10000000 record. What is difference between this two solution?

1. delete data like :

   DELETE FROM MyTable
            
   
   
           

Answer 1

If you have that many records in your table and you want to delete them all, you should consider truncate

instead of delete from . It will be much faster, but be aware that it cannot activate a trigger.

See for more details (this case sql server 2000): http://msdn.microsoft.com/en-us/library/aa260621%28SQL.80%29.aspx

Deleting the table within the application row by row will end up in long long time, as your dbms can not optimize anything, as it doesn't know in advance, that you are going to delete everything.

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