TRUNCATE is a DDL command and cannot be rolled back and All of the memory space is released back to the server. It can not use the Where conditions. DELETE is a DML command and can be rolled back. here can be use where conditions. TRUNCATE is much faster.

1>TRUNCATE is a DDL command whereas DELETE is a DML command.

2>TRUNCATE is much faster than DELETE.

Reason:When you type DELETE.all the data get copied into the Rollback Tablespace first.then delete operation get performed.Thatswhy when you type ROLLBACK after deleting a table you can get back the data(The system get it for you from the Rollback Tablespace).All this process take time.But when you type TRUNCATE it removes data directly without copying it into the Rollback Tablespace.Thatswhy TRUNCATE is faster.Once you Truncate you cann't get back the data.

3>You cann't rollback in TRUNCATE but in DELETE you can rollback.TRUNCATE removes the record permanently.

4>In case of TRUNCATE Trigger doesn't get fired.But in DML commands like DELETE .Trigger get fired.

5>You cann't use conditions(WHERE clause) in TRUNCATE.But in DELETE you can write conditions using WHERE clause.

The Main Difference Between DELETE & TRUNCATE Are :-

[1] DELETE - is a DML Command & TRUNCATE - is a DDL Command

[2] After DELETE - can rollback the Records & After TRUNATE - cannot rollback the records

[3] In DELETE Command you can give the conditions in WHERE Clause & In TRUNCATE you cannot give conditions

[4] After using DELETE Command The memory will be occupied till the user does not give ROLLBACK or COMMIT & After using TRUNCATE Command The memory realeased immediately