Question

我在我的数据库服务器上设置了MySQL慢查询日志，并将长查询时间设置为5.
只需检查日志及其日志查询，只需几毫秒。任何人都知道为什么会这样？这是一些日志。

I am using mysql sloq query log and set the following line in my.cnf file:
slow_query_log=1
long_query_time=5
log-output=FILE
log-queries-not-using-indexes

but my log file show like :

# User@Host: root[root] @ localhost []
# Query_time: 0.077108  Lock_time: 0.000042 Rows_sent: 0  Rows_examined: 292
SET timestamp=1389868398;
UPDATE `cp_sessions` SET `last_activity` = 1389868398 WHERE session_id = 'e9f397b37812e7e5b0563de6a32d181b';
# User@Host: root[root] @ localhost []
# Query_time: 0.022188  Lock_time: 0.000072 Rows_sent: 0  Rows_examined: 292
SET timestamp=1389868398;
UPDATE `cp_sessions` SET `last_activity` = 1389868398, `user_id` = NULL, `user_data` = 'a:3:{s:9:\"game_name\";s:5:\"poker\";s:3:\"utm\";N;s:5:\"url_1\";s:23:\"http://adda52merge.org/\";}' WHERE `session_id` = 'e9f397b37812e7e5b0563de6a32d181b';
# User@Host: root[root] @ localhost []
# Query_time: 0.000465  Lock_time: 0.000068 Rows_sent: 1  Rows_examined: 292
SET timestamp=1389868398;
SELECT *
FROM (`cp_sessions`)
WHERE `session_id` = '8c34926f9f6d711bdc14eeeb40b7db7b'
AND `ip_address` = '192.168.1.235'
AND `user_agent` = 'Mozilla/5.0 (Windows NT 6.1; WOW64; rv:27.0) Gecko';
# User@Host: root[root] @ localhost []
# Query_time: 0.033085  Lock_time: 0.000036 Rows_sent: 0  Rows_examined: 292
SET timestamp=1389868398;
UPDATE `cp_sessions` SET `last_activity` = 1389868398 WHERE session_id = '8c34926f9f6d711bdc14eeeb40b7db7b';
# User@Host: root[root] @ localhost []
# Query_time: 0.000350  Lock_time: 0.000055 Rows_sent: 1  Rows_examined: 292
SET timestamp=1389868398;
SELECT *
FROM (`cp_sessions`)
WHERE `session_id` = '8c34926f9f6d711bdc14eeeb40b7db7b';
# User@Host: root[root] @ localhost []
# Query_time: 0.031274  Lock_time: 0.000043 Rows_sent: 0  Rows_examined: 292
SET timestamp=1389868398;
UPDATE `cp_sessions` SET `login_attempt` = 0 WHERE `session_id` = '8c34926f9f6d711bdc14eeeb40b7db7b';
# User@Host: root[root] @ localhost []
# Query_time: 0.000298  Lock_time: 0.000029 Rows_sent: 1  Rows_examined: 292
SET timestamp=1389868398;
SELECT *
FROM (`cp_sessions`)
WHERE `user_id` = '113';
# User@Host: root[root] @ localhost []
# Query_time: 0.000479  Lock_time: 0.000080 Rows_sent: 1  Rows_examined: 292
SET timestamp=1389868398;
SELECT *
FROM (`cp_sessions`)
WHERE `session_id` = '4809d7eef185f2bf3d8e38e1858a637c'
AND `ip_address` = '192.168.1.235'
AND `user_agent` = 'Mozilla/5.0 (Windows NT 6.1; WOW64; rv:27.0) Gecko';
# User@Host: root[root] @ localhost []
# Query_time: 0.022236  Lock_time: 0.000037 Rows_sent: 0  Rows_examined: 292
SET timestamp=1389868398;
UPDATE `cp_sessions` SET `user_data` = '', `user_id` = 0 WHERE `user_id` = '113';

请帮助我，我错了，我该怎么办这个慢查询日志我想执行那个需要更多时间执行的查询。

Answer 1

设置log-queries-not-using-indexes会将任何未使用索引的查询添加到慢速日志中。

应该激活它，因为它可以轻松帮助您优化查询。

如果您想在一定时间内查询，可以执行

SELECT * FROM mysql.slow_log WHERE query_time > 5

这将使执行时间超过5秒的查询。

慢查询日志在日志文件中记录更快的查询

1 个答案: