最近，我清理了网站的缓存文件，现在 MySQL 占用的 CPU 高达 100%。它在 5 分钟内慢慢从 10% 增长到 100%，因此服务器崩溃了。幸运的是，我通过停止了服务，#service mysql stop但每次我打开它时，它都会开始占用 CPU。
这是错误日志：
#/usr/bin/mysqld_safe --datadir=/var/lib/mysql --pid-file=/var/lib/mysql/dev.system.de.pid
101112 18:22:03 mysqld_safe Starting mysqld daemon with databases from /var/lib/mysql
101112 18:22:03 [Warning] option 'innodb-additional-mem-pool-size': signed value 204800 adjusted to 524288
101112 18:22:03 [Warning] option 'innodb-log-buffer-size': signed value 204800 adjusted to 262144
101112 18:22:03 [Note] Plugin 'ndbcluster' is disabled.
101112 18:22:03 InnoDB: Started; log sequence number 0 63198013
101112 18:22:03 [Note] Event Scheduler: Loaded 0 events
101112 18:22:03 [Note] /usr/libexec/mysqld: ready for connections.
Version: '5.1.50' socket: '/var/lib/mysql/mysql.sock' port: 3306 Source distribution
Status information:
Current dir: /var/lib/mysql/
Running threads: 0 Stack size: 196608
Current locks:
lock: 0x89df8a0:
lock: 0x89d6798:
lock: 0x89cca68:
lock: 0x89c1500:
lock: 0x89b9818:
lock: 0x89adff8:
lock: 0x89a9918:
lock: 0x899b3e0:
Key caches:
default
Buffer_size: 33554432
Block_size: 1024
Division_limit: 100
Age_limit: 300
blocks used: 3
not flushed: 0
w_requests: 0
writes: 0
r_requests: 6
reads: 3
handler status:
read_key: 0
read_next: 3
read_rnd 0
read_first: 3
write: 0
delete 0
update: 0
Table status:
Opened tables: 15
Open tables: 8
Open files: 16
Open streams: 0
Alarm status:
Active alarms: 0
Max used alarms: 0
Next alarm time: 0
Begin safemalloc memory dump:
End safemalloc memory dump.
Memory status:
Non-mmapped space allocated from system: 1286144
Number of free chunks: 19
Number of fastbin blocks: 0
Number of mmapped regions: 7
Space in mmapped regions: 108834816
Maximum total allocated space: 0
Space available in freed fastbin blocks: 0
Total allocated space: 1242928
Total free space: 43216
Top-most, releasable space: 25280
Estimated memory (with thread stack): 110120960
Events status:
LLA = Last Locked At LUA = Last Unlocked At
WOC = Waiting On Condition DL = Data Locked
Event scheduler status:
State : INITIALIZED
Thread id : 0
LLA : n/a:0
LUA : n/a:0
WOC : NO
Workers : 0
Executed : 0
Data locked: NO
Event queue status:
Element count : 0
Data locked : NO
Attempting lock : NO
LLA : init_queue:132
LUA : init_queue:142
WOC : NO
Next activation : never
101112 18:26:07 [Note] /usr/libexec/mysqld: Normal shutdown
101112 18:26:08 [Note] Event Scheduler: Purging the queue. 0 events
101112 18:26:08 [ERROR] /usr/libexec/mysqld: Sort aborted
101112 18:26:10 InnoDB: Starting shutdown...
101112 18:26:13 InnoDB: Shutdown completed; log sequence number 0 63198023
101112 18:26:13 [Note] /usr/libexec/mysqld: Shutdown complete
抱歉，我不知道该怎么读。有人能帮忙吗？
答案1
在 my.cnf 中的 [mysqld] 下添加以下行：
long_query_time = 5
log-slow-queries
然后重新启动 MySQL 并查看其中是否出现任何查询（任何运行时间超过 5 秒的查询）。也可能问题实际上不是出在 MySQL 上，而是出在 Apache 上。