【MySql】使用学习

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1、太多的连接 Too many connections

2、this is incompatible with sql_mode=only_full_group_by

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1、太多的连接 Too many connections

SQL修改

set GLOBAL max_connections = 9000;
show variables like '%max_connections%';
SET PERSIST max_connections = 9000;

 配置修改

# 在 /etc/mysql/my.cnf 中追加
max_connections = 9000
max_user_connection=9000

utf8_genera_ci 不区分大小写，ci 为 case insensitive 的缩写，即大小写不敏感。
utf8_general_cs 区分大小写， cs 为 case sensitive 的缩写，即大小写敏感

 

2、this is incompatible with sql_mode=only_full_group_by

直接设置

select @@sql_mode
set global sql_mode='STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_ENGINE_SUBSTITUTION';
set session sql_mode='STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_ENGINE_SUBSTITUTION';

修改配置

[mysqld]
sql_mode='STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_ENGINE_SUBSTITUTION';
lower_case_table_names的值，0代表区分，1代表不区分。