Which one is true for delete and truncate?

Which one is true for delete and truncate?

Delete vs Truncate

SQL Delete	SQL Truncate
It removes rows one at a time.	It removes all rows in a table by deallocating the pages that are used to store the table data
It retains the identity and does not reset it to the seed value.	Truncate command reset the identity to its seed value.

Which of the following is not correct for delete and truncate?

Which of the following is not correct for Delete and Truncate statement? Select from following answers: DELETE table can be rolled back. TRUNCATE table cannot have triggers.

Does truncate invoke delete?

TRUNCATE – When we run the TRUNCATE command to delete all the rows of a table it actually doesn’t remove any row rather it deallocates the data pages. So in the case of the TRUNCATE command, triggers will not be fired because here no modification takes place.

Can a truncate be rolled back?

Unlike DELETE , however, TRUNCATE deletes the pages the data is stored on, not the individual rows. A log of what pages are deleted is still written, so a TRUNCATE can still be rolled back, as the deletion of those pages is simply not committed.

What is the difference between the DELETE and TRUNCATE commands?

The DELETE statement removes rows one at a time and records an entry in the transaction log for each deleted row. TRUNCATE TABLE removes the data by deallocating the data pages used to store the table data and records only the page deallocations in the transaction log. DELETE command is slower than TRUNCATE command.

What is the difference between DROP TRUNCATE and delete?

The DROP command removes a table from the database. All the tables’ rows, indexes, and privileges will also be removed. DROP and TRUNCATE are DDL commands, whereas DELETE is a DML command. DELETE operations can be rolled back (undone), while DROP and TRUNCATE operations cannot be rolled back.

What is difference between TRUNCATE and delete in Oracle?

TRUNCATE always removes all the rows from a table, leaving the table empty and the table structure intact whereas DELETE may remove conditionally if the where clause is used. The rows deleted by TRUNCATE TABLE statement cannot be restored and you can not specify the where clause in the TRUNCATE statement.

Is there a trigger for the TRUNCATE TABLE?

TRUNCATE TABLE cannot activate a trigger because the operation does not log the db_owner and db_ddladmin fixed database roles, and are not transferable. msdn.microsoft.com/en-us/library/ms177570.aspx – Cached – Similar

How does a TRUNCATE statement work in SQL?

This is the exact opposite of an INSERT where every column returns true. A trigger fired by a DELETE statement will always report that no columns were updated. This scenario will put the test row back then truncate the table rather than delete from it. This scenario shows that truncate statements bypass trigger execution.

Which is faster to truncate a table or delete it?

If there are no FOREIGN KEY constraints, InnoDB performs fast truncation by dropping the original table and creating an empty one with the same definition, which is much faster than deleting rows one by one.

Is there a way to prevent the truncate command?

one way to prevent the TRUNCATE command is to simply create a view WITH SCHEMABINDING of the table to protect; simple and easy to create. other than that, you can create a DML trace to track who did it, but not prevent it; there’s no scope for server or database triggers to intterupt a truncate command that i could find.