Truncate is a powerful SQL command that can quickly delete all records in a table. It performs the same function as a DELETE statement without a WHERE clause, and is much faster than the Delete command. Truncate is also useful for tables with foreign keys, as it is recorded minimally and protected by Oracle's undo and redo functionality. In this article, we'll explore the benefits of using Truncate in SQL and how it can help you manage your data more efficiently.Truncate is a Data Manipulation Language (DML) command that deletes all rows from a table.
Unlike the Delete command, it does not require a WHERE clause. This makes it much faster than Delete, as it does not need to search through each row to determine which ones to delete. Additionally, Truncate does not require Modify Table permissions, making it easier to use.Truncate also reduces the resource overhead for recording deletions, as well as the number of locks acquired. This makes it ideal for large tables with many records, as it can quickly delete all records in one go.
Furthermore, records deleted in this way cannot be restored in a rollback operation.The Stack Exchange network consists of 178 Q&A communities, including Stack Overflow, the largest and most trusted online community for developers to learn, share their knowledge, and build their careers. Connect and share knowledge in a single, structured, searchable location. TRUNCATE and DROP are almost identical in behavior and speed, so doing a TRUNCATE just before DROP is simply unnecessary.TRUNCATE is also useful for temporary tables. It is recorded minimally and protected by Oracle's undo and redo functionality.
This means that you can't undo TRUNCATE or other DDL statements because Oracle issues implicit commits immediately before and after all DDL statements. Therefore, for a table of 134 million rows, both DROP and TRUNCATE take no time at all.In addition to being faster than Delete, Truncate also has other advantages. For example, it can be used with indexed views. This allows you to quickly delete all rows from a table without having to search through each row to determine which ones to delete.Overall, Truncate is an incredibly powerful SQL command that can help you manage your data more efficiently.
It is much faster than Delete and does not require Modify Table permissions. Additionally, it reduces the resource overhead for recording deletions and the number of locks acquired. Finally, it is recorded minimally and protected by Oracle's undo and redo functionality.