SHOW VARIABLES LIKE 'max_allowed_packet' section 估算SQL语句的大小 SELECT CHAR_LENGTH('SELECT * FROM my_table WHERE id = 1') section 调整max_allowed_packet参数的值 SET GLOBAL max_allowed_packet = 1048576 section 重新执行SHOW PROCESSLIST命令 SHOW PROCESSLIST 以上旅行图展示了解决这个问题的步骤和流...
通过分析基本都是select 语句,都是查询数据太数据库返回网络回写不赢, 查看show global variables like "global max_allowed_packet" 只有1M 通过增加缓存 set global max_allowed_packet =134217728 问题得到解决!原因是多条select 返回数据越过缓存超过默认设置。
通过分析基本都是select 语句,都是查询数据太数据库返回网络回写不赢, 查看show global variables like "global max_allowed_packet" 只有1M 通过增加缓存 set global max_allowed_packet =134217728 问题得到解决!原因是多条select 返回数据越过缓存超过默认设置...
max_allowed_packet = 20M如果找不到my.cnf可以通过mysql --help | grep my.cnf去寻找my.cnf文件。 2) 方法2 进入mysql server在mysql 命令行中运行set global max_allowed_packet = 2*1024*1024*10然后关闭掉这此mysql server链接,再进入。show VARIABLES like '%max_allowed_packet%';查看下max_allowed_p...
Mysql show variables系统变量详解 mysqld服务器维护两种变量:全局变量、会话变量 全局变量影响服务器的全局操作。会话变量影响具体客户端连接相关操作。 服务器启动时,将所有全局变量初始化为默认值。可以在选项文件或命令行中指定的选项来更改这些默认值。服务器启动后,通过连接服务器并执行SET GLOBAL var_name语句可以...
show maxal lowed packet 表明该低分组 重点词汇释义 lowed哞哞叫（low的过去式与过去分词形式）packet小包; 信息包; 邮船; 大笔款项; 包装，打包; 用邮船运送
It takes more than connect_timeout seconds to obtain a connect packet. See Section 5.1.7, “Server System Variables”. Aborted Clients: Aborted Clients暗示由于客户端没有正确封锁毗连而中止的毗连数。官方表明如下: The number of connections that were aborted because the client died without closing th...
常⽤命令常⽤sql：SHOWVARIABLESLIKEcharacter% mysql学习笔记-常⽤命令 常⽤sql:SHOW VARIABLES LIKE 'character%';查看字符集 SHOW VARIABLES LIKE 'collation_%';show engines;查看引擎 show databases; 查看数据库 show tables;desc table_name;GRANT ALL PRIVILEGES ON *.* TO 'guming'@'localhost'...
SHOW[{GLOBAL|SESSION}]VARIABLESLIKE'pattern' It returns the current values of a few server-wide variables. Also, support forGLOBALandSESSIONclauses was added. mysql>SHOWGLOBALVARIABLES;+---+---+|Variable_name|Value|+---+---+|autocommit|1||collation_connection|libc_ci||query_log_format|sph...
SHOW VARIABLES LIKE 'max_join_size'; SHOW SESSION VARIABLES LIKE 'max_join_size'; To get a list of variables whose name match a pattern, use the % wildcard character in a LIKE clause: SHOW VARIABLES LIKE '%size%'; SHOW GLOBAL VARIABLES LIKE '%size%'; ...