如果我使用delete从表中删除数据，那么select查询的性能是否会降低？如果我使用truncate清除整个表与删除所选行相比，是否存在任何性能差异。
答案 0 :(得分：1)
http://dev.mysql.com/doc/refman/5.1/en/truncate-table.html
Truncate operations drop and re-create the table, which is much faster than deleting rows one by one, particularly for large tables.
还：http://www.softstuff-consulting.com/kbase/showkb.asp?id=15