Table Locking Oracle Truncate requires an exclusive table lock, delete requires a shared table lock. Triggers DML triggers do not fire on a truncate. Oracle DDL triggers are available. Remote Execution Oracle Truncate cannot be issued over a database link. Some more comments: I disagree with your 3rd statement, unless it's Oracle-specific. At least with SQL S.
It is very silly point but worth mentioning it : — Deepak Kumar Jha. Show 6 more comments. Delete does not reset identity of table. It locks the table row. Trigger is fired. Naresh Ravlani 1, 11 11 silver badges 26 26 bronze badges. Bhaumik Patel Bhaumik Patel 14k 5 5 gold badges 27 27 silver badges 33 33 bronze badges. Truncate reset identity of table What does it mean? But, What about Delete?
Now how can you edit this post? That's the bad thing about using pictures in StackOverflow. Truncate is being rolled back! Community Bot 1 1 1 silver badge. Mohit Singh Mohit Singh 5, 2 2 gold badges 20 20 silver badges 24 24 bronze badges. Nice explanation for a beginner like me — Vikas Kukreti. Short and sweet — ABH. Ah, triggers I'll add that to the list I made and credit you Polara, if that's OK.
SQL Server will not let you truncate a table with foreign keys, so your cascading point could be moot, depending on platform.
Shamseer K Shamseer K 4, 1 1 gold badge 23 23 silver badges 37 37 bronze badges. Delete would maintain the last auto-assigned ID, while Truncate resets the counter. I've added this into the community answer, and made it a bit more friendly for documenting vendor-specific issues — David Aldridge. Minimal logging in transaction log, so it is faster performance wise. Truncate uses less transaction space than the Delete statement.
Truncate cannot be used with indexed views. Delete uses the more transaction space than Truncate statement. Delete can be used with indexed views. Purvi Barot Purvi Barot 3 3 silver badges 8 8 bronze badges. I'd go further: Truncate is not executed in the context of a transaction.
Walter Mitty Walter Mitty Sachin Chourasiya Sachin Chourasiya 19k 31 31 gold badges 81 81 silver badges 97 97 bronze badges. DCookie DCookie PostgreSQL is similar to this as well. The related information below is from a blog post : While working on database, we are using Delete and Truncate without knowing the differences between them. Delete: Delete is a DML command. Delete statement is executed using a row lock,each row in the table is locked for deletion. We can specify filters in where clause.
It deletes specified data if where condition exists. Delete activities a trigger because the operation are logged individually. Delete statement removes the records one by one and it logs each entry into the transaction log. It is a DML statement. We might have a question-. We have the following data in the Employee table. EmpID column is an identity column. Once we remove the record, view the record from the table. In the following screenshot, we can see that identity value is not available because we removed that record from the table.
SQL Delete statement does not reset the identity values in a table. We can roll back a transaction using the delete statement. We can use to roll back the transaction. Execute this rollback command and view the records in the table.
We can see the deleted record gets a rollback and we can see it in the Employee table. It removes all rows in a table. SQL Server stores data of a table in the pages. The truncate command deletes rows by deallocating the pages. It can be executed for any row change or when all rows are removed. Be careful using this command. It also resets the table auto-increment value to the starting value usually 1.
But it is not used for simply removing data from a table; it deletes the table structure from the database, along with any data stored in the table. This removes all data in the table product and the structure of the table. JavaTpoint offers too many high quality services. Mail us on [email protected] , to get more information about given services. Please mail your requirement at [email protected] Duration: 1 week to 2 week.
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