Home Database Mysql Tutorial 如何定位mysql性能问题

如何定位mysql性能问题

Jun 07, 2016 pm 04:18 PM
mysql how position performance question

1.首先利用系统工具,定位问题[ top | nmon | dstat -dcnml | orzdba ]: top命令查看各个进程的资源占用情况,各个指标依次解读如下【top f|1 --help】 : 第一行:当前系统时间,系统运行时长,当前登录用户数,系统负载(任务队列的平均长度,三个数值分别

   1.首先利用系统工具,定位问题[ top | nmon | dstat -dcnml | orzdba ]:

  top命令查看各个进程的资源占用情况,各个指标依次解读如下【top f|1 --help】 :

  第一行:当前系统时间,系统运行时长,当前登录用户数,系统负载(任务队列的平均长度,三个数值分别为1,5,15分钟)【系统负载不要超过cpu的核数】

  第二行:进程总数,正在运行的进程数据,睡眠的进程数,停止的进程数,僵尸进程数

  第三行:用户空间占用cpu百分比,,内核空间占用cpu百分比,用户进程空间改变过优先级的进程占cpu的百分比,空闲cpu百分比,等待输入输出cpu百分比,,,

  第四行:物理内存总数,使用的物理内存总数,空闲内存总量,用作内核缓存的内存量 【70%】

  第五行:交换区总量,使用的交换区总量,空闲交换区总量,缓冲的交换区总量 【不要使用交换分区】

  pid 进程id

  ppid 父进程id

  Ruser real user name

  uid 进程所有者用户id

  user进程所有者用户名

  group 进程所有者组名

  tty 启动进程的终端

  pr 优先级

  NI 优先级(负值表示优先级高,正值表示优先级低)

  p 最后使用的cpu,仅在cpu多的情况下

  %CPU 上次更新到现在,cpu占用百分比

  TIME 系统使用的cpu时间总计(秒)

  TIME+ ~(1/100秒)

  %MEM 进程使用的物理内存百分比

  VIRT 进程使用的虚拟内存总量 VIRT=SWAP+RES

  SWAP 进程使用的虚拟内存总量 VIRT=SWAP+RES

  RES 进程使用的虚拟内存中,被换出的大小 进程使用的、未被换出的物理内存大小RES=CODE+DATA

  CODE可执行代码占用物理内存大小

  DATA 可执行代码以外的部分(数据段+栈)占用的物理内存大小

  SHR 共享内存大小

  nFLT 页面错误次数

  nDRT 最后一次写入到现在,被修改过的页面数

  S 进程状态 D=不可中断的睡眠状态 R=运行 S=睡眠 T=跟踪/停止 Z=僵尸进程

  COMMAND 命令行,命令

  WCHAN 若该进程在睡眠,则显示睡眠中的,系统函数名

  FLAGS 任务标志

  2.查看网络问题

  netstat -i 1 是否存在丢包,网络错误问题

  iftop 【D S】查看进程流量流向 按S切换是否显示本机的端口信息;按D切换是否显示远端目标主机的端口信息;

  3.查看io流向

  iostat -x 2

  iotop 查看进程io走向

  dd if=/dev/zero of=/data1/test bs=64k count=16k conv=fsync 目前生产环境EMC正常写入速度 565 MB/秒

  dd if=/data1/test bs=64k |dd of=/dev/null 目前生产环境EMC正常读取速度 675 MB/秒

  4.. query压力情况

  mysqladmin -uroot -P3309 ext -ri 1 |grep -i queries

  5.查看是否有锁等待

  select r.trx_id waiting_trx_id,

  r.trx_mysql_thread_id waiting_thread,

  r.trx_query waiting_query,

  b.trx_id blocking_trx_id,

  b.trx_mysql_thread_id blocking_thread,

  b.trx_query blocking_query

  from information_schema.innodb_lock_waits w

  INNER JOIN information_schema.innodb_trx b

  ON b.trx_id = w.blocking_trx_id

  INNER JOIN information_schema.innodb_trx r

  ON r.trx_id = w.requesting_trx_idG;

  6.查看innodb状态

  show engine innodb statusG;

  7.从监控工具中查看,历史记录

  zabbix

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