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Mysql命令收集

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注意
本文最后更新于 2022-06-28,文中内容可能已过时。

DBA 账号授权

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GRANT ALL PRIVILEGES ON *.* TO 'root'@'ip'  Identified by "密码" WITH GRANT OPTION;

检测mysql server是否正常提供服务

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mysqladmin -u sky -ppwd -h localhost ping

获取mysql当前的几个状态值

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mysqladmin -u sky -ppwd -h localhost status

获取数据库当前的连接信息

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mysqladmin -u sky -ppwd -h localhost processlist

获取当前数据库的连接数

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mysql -u root -ppwd -BNe "select host,count(host) from processlist group by host;" information_schema

显示mysql的uptime

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mysql -e"SHOW STATUS LIKE '%uptime%'"|awk '/ptime/{ calc = $NF / 3600;print $(NF-1), calc"Hour" }'

查看数据库的大小

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mysql -u root -ppwd-e 'select table_schema,round(sum(data_length+index_length)/1024/1024,4) from information_schema.tables group by table_schema;'

查看某个表的列信息

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mysql -u <user> --password=<password> -e "SHOW COLUMNS FROM <table>" <database> | awk '{print $1}' | tr "\n" "," | sed 's/,$//g'

执行mysql脚本

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mysql -u user-name -p password < script.sql

mysql进程监控

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ps -ef | grep "mysqld_safe" | grep -v "grep"
ps -ef | grep "mysqld" | grep -v "mysqld_safe"| grep -v "grep"

查看当前数据库的状态

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mysql -u root -ppwd -e 'show status'

mysqlcheck 工具程序可以检查(check),修 复( repair),分 析( analyze)和优化(optimize)MySQL Server 中的表

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mysqlcheck -u root -ppwd --all-databases

mysql qps查询 QPS = Questions(or Queries) / Seconds

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mysql -u root -ppwd -e 'SHOW /*!50000 GLOBAL */ STATUS LIKE "Questions"'
mysql -u root -ppwd -e 'SHOW /*!50000 GLOBAL */ STATUS LIKE "Queries"'

mysql Key Buffer 命中率 key_buffer_read_hits = (1 - Key_reads / Key_read_requests) * 100% key_buffer_write_hits= (1 - Key_writes / Key_write_requests) * 100%

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mysql -u root -ppwd -e 'SHOW /*!50000 GLOBAL */ STATUS LIKE "Key%"'

mysql Innodb Buffer 命中率 innodb_buffer_read_hits=(1-Innodb_buffer_pool_reads/Innodb_buffer_pool_read_requests) * 100%

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mysql -u root -ppwd -e 'SHOW /*!50000 GLOBAL */ STATUS LIKE "Innodb_buffer_pool_read%"'

mysql Query Cache 命中率 Query_cache_hits= (Qcache_hits / (Qcache_hits + Qcache_inserts)) * 100%

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mysql -u root -ppwd -e 'SHOW /*!50000 GLOBAL */ STATUS LIKE "Qcache%"'

mysql Table Cache 状态量

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mysql -u root -ppwd -e 'SHOW /*!50000 GLOBAL */ STATUS LIKE "Open%"'

mysql Thread Cache 命中率 Thread_cache_hits = (1 - Threads_created / Connections) * 100% 正常来说,Thread Cache 命中率要在 90% 以上才算比较合理。

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mysql -u root -ppwd -e 'SHOW /*!50000 GLOBAL */ STATUS LIKE "Thread%"'  

mysql 锁定状态:锁定状态包括表锁和行锁两种,我们可以通过系统状态变量获得锁定总次数,锁定造成其他线程等待的次数,以及锁定等待时间信息

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mysql -u root -ppwd -e 'SHOW /*!50000 GLOBAL */ STATUS LIKE "%lock%"'

mysql 复制延时量 在slave节点执行

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mysql -u root -ppwd -e 'SHOW SLAVE STATUS'

mysql Tmp table 状况 Tmp Table 的状况主要是用于监控 MySQL 使用临时表的量是否过多,是否有临时表过大而不得不从内存中换出到磁盘文件上

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mysql -u root -ppwd -e 'SHOW /*!50000 GLOBAL */ STATUS LIKE "Created_tmp%"'

mysql Binlog Cache 使用状况:Binlog Cache 用于存放还未写入磁盘的 Binlog 信 息 。

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mysql -u root -ppwd -e 'SHOW /*!50000 GLOBAL */ STATUS LIKE "Binlog_cache%"'

mysql nnodb_log_waits 量:Innodb_log_waits 状态变量直接反应出 Innodb Log Buffer 空间不足造成等待的次数

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mysql -u root -ppwd -e 'SHOW /*!50000 GLOBAL */ STATUS LIKE "Innodb_log_waits'