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

Option 1 will create a very large transaction and have a big impact on the log / performance, as well as escalating locks so that the table will be unavailable. Option 2 will be slower, although it will generate less impact on the log (assuming bulk / full mode)

If you want to get rid of all the data, Truncate Table MyTable would be faster than both, although it has no facility to filter rows, it does a meta data change at the back and basically drops the IAM on the floor for the table in question.