Difference between truncate, delete, drop

truncate

• DDL does not delete table structure, only table data;
• Delete all rows at once, do not count in the log, cannot be rolled back,
• When deleting data, it is equivalent to delete from table. (see the difference below)
• When truncate deletes a table, the space occupied by indexes and foreign keys will return to the minimum initialized; triggers cannot be triggered

delete

• DML does not delete the table structure, only deletes the data;
• Delete line by line, each deleted line is counted in the log and can be rolled back;
• Indexes and foreign keys are maintained

drop

• DDL deletes the entire table structure, the fastest

 

 

1. 速度：drop>truncate>delete
2. delete from table and truncate: For tables referenced by foreign key constraints, you cannot use truncate, use delete
3. Only delete can be rolled back

 

http://www.cnblogs.com/zhizhao/p/7825469.html