Common system level commands in MySQL

MXC Xiao 2021-01-21 23:46:19
common level commands mysql

to grant authorization

show grants; // View the permissions of the current user
grant all privileges on test.* to jack@'%' identified by '123'; // Username jack password 123, grant test Database all permissions
revoke all privileges on *.* from jack@'%'; // Take back the user jack@ Address of the user (%), All permissions for all libraries 


SHOW INDEX FROM my_table; // see my_table The index of
CREATE [UNIQUE] INDEX idx_name ON my_table(col1,col2) // by my_table Tabular col1,col2 Field , add to [ only ] Indexes idx_name
ALTER TABLE my_table ADD PRIMARY KEY(my_id) // by my_table Tabular my_id Field , Add a unique primary key index
ALTER TABLE my_table ADD INDEX idx_name(my_cloumn) // by my_table Tabular my_cloumn Field , Add a normal index idx_name
ALTER TABLE my_table ADD UNIQUE uq_name(my_cloumn) // by my_table Tabular my_cloumn Field , Add unique index uq_name
ALTER TABLE my_table ADD FULLTEXT ft_name(my_cloumn) // by my_table Tabular my_cloumn Field , Add full text index ft_name
DROP INDEX idx_name ON my_table; // Delete my_table Tabular idx_name Indexes 


lock table mylock read; // by mylock Read lock on the meter
lock table mylock write; // by mylock Table write lock
unlock tables; // Release the lock 

Log engine

show engines; // see MySQL Supported storage indexes
show variables like '%storage_engine%' // View the storage engine currently in use
show variables like 'slow_query_log%'; // see  Whether to turn on slow log
set global slow_query_log = 1; // Turn on  Slow query log , restart MySQL invalid
show variables like 'long_query_time%'; // see  Slow query log threshold , The default is 10s Beyond this value, it will be recorded
set global long_query_time = 3; // Set up  The threshold of slow query log is 3s, restart MySQL invalid
show global status like '%slow_queries%'; // Check the system for slow sql The article number
show variables like 'profiling%'; // see Show Profile Open or not
set profiling=on; // Turn on Show Profiles
show variables like 'log_bin%'; // see binlog state
set global log_bin_trust_function_creators = 1; // Add a store function creator that you can trust
show profiles; // Look at the recent 15( Default ) strip sql perform 
show profile cpu, block io for query Query_ID; // Look at a specific sql perform  situation 


show [full] processlist; // See which threads are running
show open tables from test; // stay test The table cache in the library is not opened TEMPORARY surface ,in_use How many connections are used
show status like 'key%'; //myIsam in cache Index hit rate ,key_buffer_read_hits=(1-key_reads/key_read_requests)
show status like 'innodb_buffer_pool_read%'; //innodb Of buffer shooting (1-innodb_buffer_pool_reads/innodb_buffer_pool_read_requests)
show status like 'Qcache%'; //query cache shooting ,query_cache_hits =Qcache_hits/(Qcache_hits+Qcache_inserts)
show status like '%connections%'; // View the total number of connections to the server Connections And maximum connections Max_used_connections
show status like 'thread%'; // Connection cache >90% reasonable ,thread_cache_hits = (1- threads_created/connections) * 100 %;
show status like 'created_tmp%'; // View temporary table Created_tmp_disk_tables / Created_tmp_tables<25%


本文为[MXC Xiao]所创,转载请带上原文链接,感谢

  1. 【计算机网络 12(1),尚学堂马士兵Java视频教程
  2. 【程序猿历程,史上最全的Java面试题集锦在这里
  3. 【程序猿历程(1),Javaweb视频教程百度云
  4. Notes on MySQL 45 lectures (1-7)
  5. [computer network 12 (1), Shang Xuetang Ma soldier java video tutorial
  6. The most complete collection of Java interview questions in history is here
  7. [process of program ape (1), JavaWeb video tutorial, baidu cloud
  8. Notes on MySQL 45 lectures (1-7)
  9. 精进 Spring Boot 03:Spring Boot 的配置文件和配置管理,以及用三种方式读取配置文件
  10. Refined spring boot 03: spring boot configuration files and configuration management, and reading configuration files in three ways
  11. 精进 Spring Boot 03:Spring Boot 的配置文件和配置管理,以及用三种方式读取配置文件
  12. Refined spring boot 03: spring boot configuration files and configuration management, and reading configuration files in three ways
  13. 【递归,Java传智播客笔记
  14. [recursion, Java intelligence podcast notes
  15. [adhere to painting for 386 days] the beginning of spring of 24 solar terms
  16. K8S系列第八篇(Service、EndPoints以及高可用kubeadm部署)
  17. K8s Series Part 8 (service, endpoints and high availability kubeadm deployment)
  18. 【重识 HTML (3),350道Java面试真题分享
  19. 【重识 HTML (2),Java并发编程必会的多线程你竟然还不会
  20. 【重识 HTML (1),二本Java小菜鸟4面字节跳动被秒成渣渣
  21. [re recognize HTML (3) and share 350 real Java interview questions
  22. [re recognize HTML (2). Multithreading is a must for Java Concurrent Programming. How dare you not
  23. [re recognize HTML (1), two Java rookies' 4-sided bytes beat and become slag in seconds
  24. 造轮子系列之RPC 1:如何从零开始开发RPC框架
  25. RPC 1: how to develop RPC framework from scratch
  26. 造轮子系列之RPC 1:如何从零开始开发RPC框架
  27. RPC 1: how to develop RPC framework from scratch
  28. 一次性捋清楚吧,对乱糟糟的,Spring事务扩展机制
  29. 一文彻底弄懂如何选择抽象类还是接口,连续四年百度Java岗必问面试题
  30. Redis常用命令
  31. 一双拖鞋引发的血案,狂神说Java系列笔记
  32. 一、mysql基础安装
  33. 一位程序员的独白:尽管我一生坎坷,Java框架面试基础
  34. Clear it all at once. For the messy, spring transaction extension mechanism
  35. A thorough understanding of how to choose abstract classes or interfaces, baidu Java post must ask interview questions for four consecutive years
  36. Redis common commands
  37. A pair of slippers triggered the murder, crazy God said java series notes
  38. 1、 MySQL basic installation
  39. Monologue of a programmer: despite my ups and downs in my life, Java framework is the foundation of interview
  40. 【大厂面试】三面三问Spring循环依赖,请一定要把这篇看完(建议收藏)
  41. 一线互联网企业中,springboot入门项目
  42. 一篇文带你入门SSM框架Spring开发,帮你快速拿Offer
  43. 【面试资料】Java全集、微服务、大数据、数据结构与算法、机器学习知识最全总结,283页pdf
  44. 【leetcode刷题】24.数组中重复的数字——Java版
  45. 【leetcode刷题】23.对称二叉树——Java版
  46. 【leetcode刷题】22.二叉树的中序遍历——Java版
  47. 【leetcode刷题】21.三数之和——Java版
  48. 【leetcode刷题】20.最长回文子串——Java版
  49. 【leetcode刷题】19.回文链表——Java版
  50. 【leetcode刷题】18.反转链表——Java版
  51. 【leetcode刷题】17.相交链表——Java&python版
  52. 【leetcode刷题】16.环形链表——Java版
  53. 【leetcode刷题】15.汉明距离——Java版
  54. 【leetcode刷题】14.找到所有数组中消失的数字——Java版
  55. 【leetcode刷题】13.比特位计数——Java版
  56. oracle控制用户权限命令
  57. 三年Java开发,继阿里,鲁班二期Java架构师
  58. Oracle必须要启动的服务
  59. 万字长文!深入剖析HashMap,Java基础笔试题大全带答案
  60. 一问Kafka就心慌?我却凭着这份,图灵学院vip课程百度云