Following are the some main differences between oracle TRUNCATE and DELETE statements.
Note -REASON : When you type DELETE, all the data get copied into the Rollback Tablespace first, then delete operation get performed. That's why when you type ROLLBACK after deleting from a table, you can get back the data(the system get it for you from the ROLLBACK Tablespace). All this process takes time. But when you type TRUNCATE, it removes data directly without copying it into the Rollback Tablespace. That's why TRUNCATE is faster. Once you TRUNCATE, you cannot get back the data.
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