Deleting the whole table takes lot of time, as MySQL performs operations row by row. The quickest way to delete all of the rows of a table (preserving the table structure) is to use the TRUNCATE TABLE statement.
Truncate is a DDL operation in MySQL, meaning once the data is truncated, it cannot be rolled back:
mysql> TRUNCATE TABLE customers;Query OK, 0 rows affected (0.03 sec)
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