MySQL日志突然暴涨

1. 现象 今天协助其他同学排查问题的时候,发现数据库错误日志文件已经有9G以上了,打开内容查看如下: ===================================== 2020-07-08 13:47:43 0x7fe3723ff700 INNOD...

1. 现象

今天协助其他同学排查问题的时候,发现数据库错误日志文件已经有9G以上了,打开内容查看如下:

=====================================
2020-07-08 13:47:43 0x7fe3723ff700 INNODB MONITOR OUTPUT
=====================================
Per second averages calculated from the last 1 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 28112548 srv_active, 0 srv_shutdown, 18948137 srv_idle
srv_master_thread log flush and writes: 47060685
----------
SEMAPHORES
----------
OS WAIT ARRAY INFO: reservation count 213360683
OS WAIT ARRAY INFO: reservation count 218012898
OS WAIT ARRAY INFO: reservation count 218624956
OS WAIT ARRAY INFO: reservation count 223392430
OS WAIT ARRAY INFO: reservation count 213358783
OS WAIT ARRAY INFO: reservation count 217996917
OS WAIT ARRAY INFO: reservation count 218627068
OS WAIT ARRAY INFO: reservation count 223399094
OS WAIT ARRAY INFO: reservation count 213372264
OS WAIT ARRAY INFO: reservation count 217974752
OS WAIT ARRAY INFO: reservation count 218606657
OS WAIT ARRAY INFO: reservation count 223387430
OS WAIT ARRAY INFO: reservation count 213382268
OS WAIT ARRAY INFO: reservation count 218029924
OS WAIT ARRAY INFO: reservation count 218619464
OS WAIT ARRAY INFO: reservation count 223399870
OS WAIT ARRAY INFO: signal count 2558329753
RW-shared spins 0, rounds 2208700138, OS waits 822920663
RW-excl spins 0, rounds 80631903713, OS waits 1603642807
RW-sx spins 1202513351, rounds 33533328545, OS waits 959708531
Spin rounds per wait: 2208700138.00 RW-shared, 80631903713.00 RW-excl, 27.89 RW-sx
------------------------
LATEST DETECTED DEADLOCK
------------------------
2020-04-21 19:50:05 0x7fe28a7fd700
...
...
...
Process ID=54642, Main thread ID=140614440048384, state: sleeping
Number of rows inserted 5475421722, updated 433989820, deleted 4122238559, read 669572614313
708.29 inserts/s, 34.97 updates/s, 573.43 deletes/s, 29898.10 reads/s
----------------------------
END OF INNODB MONITOR OUTPUT
============================

此内容是InnoDB MONITOR的结果(和show engine innodb status结果一样),也就是说开启了InnoDB监视器。

主要涉及的参数有innodb_status_output 和 innodb_status_output_locks ,这两个系统变量是用来启用标准innodb监控和 InnoDB锁监控的,查看本实例参数情况:

mysql> show  global  variables like '%innodb_status%';
+----------------------------+-------+
| Variable_name              | Value |
+----------------------------+-------+
| innodb_status_output       | ON   |
| innodb_status_output_locks | ON   |
+----------------------------+-------+
2 rows in set (0.01 sec)

 说明确实已经开启了。

2. 关闭INNODB MONITOR

可以在线关闭INNODB MONITOR,但是在关闭前建议先将原日志备份(重命名)

mv  mysqld.log   mysqld.log.20200708

再修改参数,关闭监控

mysql> set global innodb_status_output='OFF';
Query OK, 0 rows affected (0.00 sec)

mysql> set global innodb_status_output_locks='OFF';
Query OK, 0 rows affected (0.00 sec)

mysql> flush logs;

时间有限,今天暂时就简单说明现象及引起日志暴涨的原因,后续有机会在关注日志内容及相关参数意义。

想了解更多内容或参与技术交流可以关注微信公众号【数据库干货铺】或进技术交流群沟通。

  • 发表于 2020-07-10 18:00
  • 阅读 ( 104 )
  • 分类:网络文章

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