资讯

精准传达 • 有效沟通

从品牌网站建设到网络营销策划，从策略到执行的一站式服务

网站建设 >

查看其它板块

Percona5.5如何定位未使用的索引

这篇文章主要为大家展示了“Percona 5.5如何定位未使用的索引”，内容简而易懂，条理清晰，希望能够帮助大家解决疑惑，下面让小编带领大家一起研究并学习一下“Percona 5.5如何定位未使用的索引”这篇文章吧。

创新互联成都网站建设专业公司，是成都网站开发公司,为服务器租用提供网站建设服务,有成熟的网站定制合作流程，提供网站定制设计服务：原型图制作、网站创意设计、前端HTML5制作、后台程序开发等。成都网站改版热线：028-86922220

打开userstat参数，然后让MySQL运行一段时间。
之后可以在INFORMATION_SCHEMA.INDEX_STATISTICS表中查询到索引的使用频率。

  1. mysql> show global variables like '%users%';

  2. +---------------+-------+

  3. | Variable_name | Value |

  4. +---------------+-------+

  5. | userstat | OFF |

  6. +---------------+-------+

  7. 1 row in set (0.00 sec)

  9. mysql> select * from information_schema.index_statistics;

  10. Empty set (0.00 sec)

  12. mysql> set global userstat=1;

  13. Query OK, 0 rows affected (0.00 sec)

  15. mysql> show global variables like '%users%';

  16. +---------------+-------+

  17. | Variable_name | Value |

  18. +---------------+-------+

  19. | userstat | ON |

  20. +---------------+-------+

  21. 1 row in set (0.00 sec)

  23. mysql> select * from information_schema.index_statistics;

  24. Empty set (0.00 sec)

  26. mysql> explain select * from emp where hiredate > '1982-01-01' and deptno = 20;

  27. +----+-------------+-------+-------+---------------------------+------------------+---------+------+------+-------------+

  28. | id | select_type | table | type | possible_keys | key | key_len | ref | rows | Extra |

  29. +----+-------------+-------+-------+---------------------------+------------------+---------+------+------+-------------+

  30. | 1 | SIMPLE | emp | range | idx_date_sal_job,idx_date | idx_date_sal_job | 4 | NULL | 3 | Using where |

  31. +----+-------------+-------+-------+---------------------------+------------------+---------+------+------+-------------+

  32. 1 row in set (0.00 sec)

  34. mysql> select * from information_schema.index_statistics;

  35. Empty set (0.00 sec)

  37. mysql> select * from emp where hiredate > '1982-01-01' and deptno = 20;

  38. +-------+-------+---------+------+---------------------+------+------+--------+

  39. | empno | ename | job | mgr | hiredate | sal | comm | deptno |

  40. +-------+-------+---------+------+---------------------+------+------+--------+

  41. | 7788 | SCOTT | ANALYST | 7566 | 1982-12-09 00:00:00 | 3000 | NULL | 20 |

  42. | 7876 | ADAMS | CLERK | 7788 | 1983-01-12 00:00:00 | 1100 | NULL | 20 |

  43. +-------+-------+---------+------+---------------------+------+------+--------+

  44. 2 rows in set (0.00 sec)

  46. mysql> select * from information_schema.index_statistics;

  47. +--------------+------------+------------------+-----------+

  48. | TABLE_SCHEMA | TABLE_NAME | INDEX_NAME | ROWS_READ |

  49. +--------------+------------+------------------+-----------+

  50. | test | emp | idx_date_sal_job | 3 |

  51. +--------------+------------+------------------+-----------+

  52. 1 row in set (0.04 sec)

  54. mysql> select * from emp;

  55. +-------+--------+-----------+------+---------------------+------+------+--------+

  56. | empno | ename | job | mgr | hiredate | sal | comm | deptno |

  57. +-------+--------+-----------+------+---------------------+------+------+--------+

  58. | 7369 | SMITH | CLERK | 7902 | 1980-12-17 00:00:00 | 800 | NULL | 20 |

  59. | 7499 | ALLEN | SALESMAN | 7698 | 1981-02-20 00:00:00 | 1600 | 300 | 30 |

  60. | 7521 | WARD | SALESMAN | 7698 | 1981-02-22 00:00:00 | 1250 | 500 | 30 |

  61. | 7566 | JONES | MANAGER | 7839 | 1981-04-02 00:00:00 | 2975 | NULL | 20 |

  62. | 7654 | MARTIN | SALESMAN | 7698 | 1981-09-28 00:00:00 | 1250 | 1400 | 30 |

  63. | 7698 | BLAKE | MANAGER | 7839 | 1981-05-01 00:00:00 | 2850 | NULL | 30 |

  64. | 7782 | CLARK | MANAGER | 7839 | 1981-06-09 00:00:00 | 2450 | NULL | 10 |

  65. | 7788 | SCOTT | ANALYST | 7566 | 1982-12-09 00:00:00 | 3000 | NULL | 20 |

  66. | 7839 | KING | PRESIDENT | NULL | 1981-11-17 00:00:00 | 5000 | NULL | 10 |

  67. | 7844 | TURNER | SALESMAN | 7698 | 1981-09-08 00:00:00 | 1500 | 0 | 30 |

  68. | 7876 | ADAMS | CLERK | 7788 | 1983-01-12 00:00:00 | 1100 | NULL | 20 |

  69. | 7900 | JAMES | CLERK | 7698 | 1981-12-03 00:00:00 | 950 | NULL | 30 |

  70. | 7902 | FORD | ANALYST | 7566 | 1981-12-03 00:00:00 | 3000 | NULL | 20 |

  71. | 7934 | MILLER | CLERK | 7782 | 1982-01-23 00:00:00 | 1300 | NULL | 10 |

  72. +-------+--------+-----------+------+---------------------+------+------+--------+

  73. 14 rows in set (0.00 sec)

  75. mysql> select * from information_schema.index_statistics;

  76. +--------------+------------+------------------+-----------+

  77. | TABLE_SCHEMA | TABLE_NAME | INDEX_NAME | ROWS_READ |

  78. +--------------+------------+------------------+-----------+

  79. | test | emp | PRIMARY | 14 |

  80. | test | emp | idx_date_sal_job | 3 |

  81. +--------------+------------+------------------+-----------+

  82. 2 rows in set (0.00 sec)

  84. mysql> select * from emp where hiredate > '1982-01-01' and deptno = 20;

  85. +-------+-------+---------+------+---------------------+------+------+--------+

  86. | empno | ename | job | mgr | hiredate | sal | comm | deptno |

  87. +-------+-------+---------+------+---------------------+------+------+--------+

  88. | 7788 | SCOTT | ANALYST | 7566 | 1982-12-09 00:00:00 | 3000 | NULL | 20 |

  89. | 7876 | ADAMS | CLERK | 7788 | 1983-01-12 00:00:00 | 1100 | NULL | 20 |

  90. +-------+-------+---------+------+---------------------+------+------+--------+

  91. 2 rows in set (0.00 sec)

  93. mysql> select * from emp;

  94. +-------+--------+-----------+------+---------------------+------+------+--------+

  95. | empno | ename | job | mgr | hiredate | sal | comm | deptno |

  96. +-------+--------+-----------+------+---------------------+------+------+--------+

  97. | 7369 | SMITH | CLERK | 7902 | 1980-12-17 00:00:00 | 800 | NULL | 20 |

  98. | 7499 | ALLEN | SALESMAN | 7698 | 1981-02-20 00:00:00 | 1600 | 300 | 30 |

  99. | 7521 | WARD | SALESMAN | 7698 | 1981-02-22 00:00:00 | 1250 | 500 | 30 |

  100. | 7566 | JONES | MANAGER | 7839 | 1981-04-02 00:00:00 | 2975 | NULL | 20 |

  101. | 7654 | MARTIN | SALESMAN | 7698 | 1981-09-28 00:00:00 | 1250 | 1400 | 30 |

  102. | 7698 | BLAKE | MANAGER | 7839 | 1981-05-01 00:00:00 | 2850 | NULL | 30 |

  103. | 7782 | CLARK | MANAGER | 7839 | 1981-06-09 00:00:00 | 2450 | NULL | 10 |

  104. | 7788 | SCOTT | ANALYST | 7566 | 1982-12-09 00:00:00 | 3000 | NULL | 20 |

  105. | 7839 | KING | PRESIDENT | NULL | 1981-11-17 00:00:00 | 5000 | NULL | 10 |

  106. | 7844 | TURNER | SALESMAN | 7698 | 1981-09-08 00:00:00 | 1500 | 0 | 30 |

  107. | 7876 | ADAMS | CLERK | 7788 | 1983-01-12 00:00:00 | 1100 | NULL | 20 |

  108. | 7900 | JAMES | CLERK | 7698 | 1981-12-03 00:00:00 | 950 | NULL | 30 |

  109. | 7902 | FORD | ANALYST | 7566 | 1981-12-03 00:00:00 | 3000 | NULL | 20 |

  110. | 7934 | MILLER | CLERK | 7782 | 1982-01-23 00:00:00 | 1300 | NULL | 10 |

  111. +-------+--------+-----------+------+---------------------+------+------+--------+

  112. 14 rows in set (0.00 sec)

  114. mysql> select * from information_schema.index_statistics;

  115. +--------------+------------+------------------+-----------+

  116. | TABLE_SCHEMA | TABLE_NAME | INDEX_NAME | ROWS_READ |

  117. +--------------+------------+------------------+-----------+

  118. | test | emp | PRIMARY | 28 |

  119. | test | emp | idx_date_sal_job | 6 |

  120. +--------------+------------+------------------+-----------+

  121. 2 rows in set (0.00 sec)

以上是“Percona 5.5如何定位未使用的索引”这篇文章的所有内容，感谢各位的阅读！相信大家都有了一定的了解，希望分享的内容对大家有所帮助，如果还想学习更多知识，欢迎关注创新互联行业资讯频道！


网站题目：Percona5.5如何定位未使用的索引
链接分享：http://cdkjz.cn/article/gphgji.html
返回首页 了解更多建站资讯

相关资讯

多年建站经验

多一份参考，总有益处

联系快上网，免费获得专属《策划方案》及报价

咨询相关问题或预约面谈，可以通过以下方式与我们联系

大客户专线   成都：13518219792   座机：028-86922220

在线咨询 提交需求
友情链接 交换友情链接
尊格展览达州服务器托管兴久牧业移动网站建设成都品牌网站设计高端品牌网站建设做网站四川电信机房托管自适应网站成都印刷厂

成都网站建设公司地址：成都市青羊区太升南路288号锦天国际A座10层 建设咨询028-86922220

成都快上网科技有限公司-四川网站建设设计公司 | 蜀ICP备19037934号 Copyright 2020,ALL Rights Reserved cdkjz.cn | 成都网站建设 | © Copyright 2020版权所有.

专家团队为您提供成都网站建设,成都网站设计,成都品牌网站设计,成都营销型网站制作等服务,成都建网站就找快上网！ | 成都网站建设哪家好？ | 网站建设地图