我有一个托管在专用服务器上的小网站(FreeBSD 9.2,MySQL 5.6.1和php 5.5.5).
问题是,即使网站上有少量访问者,MySQL也会占用大量的cpu资源.
数据库很小(最大的表约为12k行)
问题是,即使网站上有少量访问者,MySQL也会占用大量的cpu资源.
数据库很小(最大的表约为12k行)
我在my.conf中启用了慢查询登录,但没有记录查询.
错误日志文件不包含任何有用的信息(实际上它是空的)
这是服务器规格
中央处理器
hw.machine: amd64 hw.model: Intel(R) Xeon(R) CPU X3330 @ 2.66GHz hw.ncpu: 4 hw.machine_arch: amd64
HHD转移信息
Seek times:
Full stroke: 250 iter in 1.507837 sec = 6.031 msec
Half stroke: 250 iter in 1.461401 sec = 5.846 msec
Quarter stroke: 500 iter in 5.829283 sec = 11.659 msec
Short forward: 400 iter in 2.668680 sec = 6.672 msec
Short backward: 400 iter in 3.261849 sec = 8.155 msec
Seq outer: 2048 iter in 0.247219 sec = 0.121 msec
Seq inner: 2048 iter in 0.246036 sec = 0.120 msec
Transfer rates:
outside: 102400 kbytes in 1.207812 sec = 84781 kbytes/sec
middle: 102400 kbytes in 1.342168 sec = 76294 kbytes/sec
inside: 102400 kbytes in 1.893578 sec = 54078 kbytes/sec
I/O command overhead:
time to read 10MB block 0.131751 sec = 0.006 msec/sector
time to read 20480 sectors 2.170542 sec = 0.106 msec/sector
calculated command overhead
= 0.100 msec/sector
顶部(在负载高的时刻)
Mem: 1518M Active,1396M Inact,732M Wired,50M Cache,435M Buf,239M Free 4949 mysql 27 52 0 2236M 1434M uwait 3 180:02 66.26% mysqld
my.cnf中
[mysqld] sql_mode=NO_ENGINE_SUBSTITUTION skip-external-locking max_connections=5000 max_connect_errors=1500 ft_min_word_len = 2 myisam_sort_buffer_size = 64M # Log slow queries slow_query_log = 1 slow_query_log_file = /var/log/slow-queries.log long_query_time = 1 key_buffer = 384M max_allowed_packet = 32M thread_stack = 128K thread_cache_size = 128 thread_concurrency = 16 wait_timeout = 2000 interactive_timeout = 10000 join_buffer_size = 1M sort_buffer_size = 2M read_buffer_size = 1M read_rnd_buffer_size = 2M query_cache_size = 268435456 query_cache_type=1 query_cache_limit=1048576
我不知道出了什么问题.
解决方法
一些常规故障排除提示
>检查您是否有其他/未知/外部数据库连接(例如：netstat -tapn)>使用mysqladmin processlist和mysqladmin进程状态检查正在运行的查询和服务器的状态,这可能会导致向表添加索引.>检查慢查询日志(你已经完成了这个)>检查mysql错误日志(你已经完成了这个)>检查服务器有关RAM内存和可用磁盘空间的一般状态：free -m,df -h>如果你有可用的内存,请在配置文件中增加innodb_buffer_pool_size值,这样就有更多的缓存