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  • Mysql查看连接数相关信息

    MySQL查看连接数相关信息在

    数据库:INFORMATION_SCHEMA
    表:PROCESSLIST

    表结构如下:

    mysql> desc PROCESSLIST;
    +---------+-------------+------+-----+---------+-------+
    | Field   | Type        | Null | Key | Default | Extra |
    +---------+-------------+------+-----+---------+-------+
    | ID      | bigint(4)   | NO   |     | 0       |       |
    | USER    | varchar(16) | NO   |     |         |       |
    | HOST    | varchar(64) | NO   |     |         |       |
    | DB      | varchar(64) | YES  |     | NULL    |       |
    | COMMAND | varchar(16) | NO   |     |         |       |
    | TIME    | int(7)      | NO   |     | 0       |       |
    | STATE   | varchar(64) | YES  |     | NULL    |       |
    | INFO    | longtext    | YES  |     | NULL    |       |
    +---------+-------------+------+-----+---------+-------+
    8 rows in set (0.00 sec)

    查看单个host连接数:

    select substring_index(host,":",1) ,count(1) as cnt 
    from INFORMATION_SCHEMA.PROCESSLIST
    group by substring_index(host,":",1) 
    order by cnt desc 

    查看db连接数:

    select db,count(1) as cnt from INFORMATION_SCHEMA.PROCESSLIST group by db order by cnt desc;
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  • 原文地址:https://www.cnblogs.com/zhzhang/p/7340692.html
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