为什么mysql的slowlog记录了查询时间很短的日志

为什么mysql的slowlog记录了查询时间很短的日志？

The slow query log consists of all SQL statements that took more than

long_query_time

seconds to execute and (as of MySQL 5.1.21) required at least

min_examined_row_limit

rows to be examined.

系统里

| long_query_time | 1.000000 |
| min_examined_row_limit | 0 |
为啥slowlog里很多1s不到的记录？

问了公司的牛人，答案：

| log_queries_not_using_indexes | ON |

set global log_queries_not_using_indexes='0'即可