mysql8 的long_query_time 單位是多少？

mysql> set global long_query_time=1000;

mysql>  show variables like 'long_query_time';
+-----------------+------------+
| Variable_name   | Value      |
+-----------------+------------+
| long_query_time | 100.000000 |
+-----------------+------------+
1 row in set (0.01 sec)
#####################################################

mysql> set global long_query_time=500;

mysql>  show variables like 'long_query_time';
+-----------------+------------+
| Variable_name   | Value      |
+-----------------+------------+
| long_query_time | 100.000000 |
+-----------------+------------+
1 row in set (0.01 sec)

 

###############################################

=============默認是10==============

mysql> show variables like 'long_query_time';
+-----------------+-----------+
| Variable_name   | Value     |
+-----------------+-----------+
| long_query_time | 10.000000 |

 

 

艾瑪，怎麼單位mysql 8.0.17？？？？？

 

官方：

https://dev.mysql.com/doc/refman/8.0/en/slow-query-log.html

Slow Query Log Parameters

The minimum and default values of long_query_time are 0 and 10, respectively. The value can be specified to a resolution of microseconds.

慢速查詢日誌參數

long_query_time的最小值和默認值分別爲0和10。該值可以指定爲微秒分辨率。

那就是s嘮！