Hibernate / SQL
What is the difference between Truncate & Delete?
DELETE is a DML statement that deletes complete rows from the table and produces the count of deleted rows. It also allows us to filter and delete any specific records using the WHERE clause from the table. After executing this command, we can rollback the deleted data because it makes an entry in the transaction log for each deleted row.
TRUNCATE is a DDL statement used to remove complete data from the table without removing the table structure. So indexes, constraints, columns, the structure is maintained even after the statement is executed. We cannot use the WHERE clause with this command so that filtering of records is not possible. After executing this command, we cannot rollback the deleted data because the log is not maintained while performing this operation.
The truncate command deallocates the pages instead of rows and makes an entry for the deallocating pages instead of rows in transaction logs. This command locks the pages instead of rows; thus, it requires fewer locks and resources. Note that we cannot use the truncate statement when a table is referenced by a foreign key or participates in an indexed view.
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