TRUNCATE
- TRUNCATE is a DDL(Data Manipulation Language) command
- TRUNCATE is executed using a table lock and whole table is locked for remove all records.
- We cannot use Where clause with TRUNCATE.
- TRUNCATE removes all rows from a table.
- Minimal logging in transaction log, so it is performance wise faster.
- 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.
- Identify column is reset to its seed value if table contains any identity column.
- To use Truncate on a table you need at least ALTER permission on the table.
- Truncate uses the less transaction space than Delete statement.
- Truncate cannot be used with indexed views.
- DELETE is a DML(Data Definition Languages) command.
- DELETE is executed using a row lock, each row in the table is locked for deletion.
- We can use where clause with DELETE to filter & delete specific records.
- The DELETE command is used to remove rows from a table based on WHERE condition.
- It maintain the log, so it slower than TRUNCATE.
- The DELETE statement removes rows one at a time and records an entry in the transaction log for each deleted row.
- Identity of column keep DELETE retain the identity.
- To use Delete you need DELETE permission on the table.
- Delete uses the more transaction space than Truncate statement.
- Delete can be used with indexed views.
- The DROP command removes a table from the database.
- All the tables' rows, indexes and privileges will also be removed.
- No DML(Data Definition Languages) triggers will be fired.
- The operation cannot be rolled back.
- 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.
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