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MySQL 5.7 Reference Manual
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MySQL 5.7 Reference Manual  /  ...  /  Speed of DELETE Statements

9.2.2.3 Speed of DELETE Statements

The time required to delete individual rows in a MyISAM table is exactly proportional to the number of indexes. To delete rows more quickly, you can increase the size of the key cache by increasing the key_buffer_size system variable. See Section 9.12.2, “Tuning Server Parameters”.

To delete all rows from a MyISAM table, TRUNCATE TABLE tbl_name is faster than DELETE FROM tbl_name. Truncate operations are not transaction-safe; an error occurs when attempting one in the course of an active transaction or active table lock. See Section 14.1.34, “TRUNCATE TABLE Syntax”.


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