Sql>show variables like “character_set%”; 20. collation_connection 连接字符集的校对规则。 Sql>show variables like “collation%”; 21. collation_database 默认数据库使用的校对规则。当默认数据库改变时服务器则设置该变量。如果没有默认数据库,变量的值同collation_server。 Sql>show variables like “col...
# 显示当前数据库中所有表的名称 SHOW [FULL] TABLES [FROM db_name] [like_or_where] # 显示触发器信息(需要先创建触发器) SHOW TRIGGERS [FROM db_name] [like_or_where] # 显示MySQL变量信息 SHOW [GLOBAL | SESSION] VARIABLES [like_or_where] # 显示最后一个执行语句所产生的警告信息 SHOW WARNIN...
看不到修改情况的话,重开连接,或者换一个语句:show global variables like 'long_query_time';4)记录慢SQL并后续分析假设我们成功设置慢SQL阈值时间为3秒(set global long_query_time=3;)。模拟超时SQL:select sleep(4);查询当前系统中有多少条慢查询记录:show global status like '%Slow_queries%'; [ˈ...
SHOW[GLOBAL|SESSION]VARIABLES[LIKE'pattern'|WHEREexpr] SHOW VARIABLESshows the values of MySQL system variables (seeSection 7.1.8, “Server System Variables”). This statement does not require any privilege. It requires only the ability to connect to the server. System variable information is also...
SHOW VARIABLES LIKE '%slow%'; slow_query_log_file | /usr/local/mysql5.7.32/data/mysqlupdate01-slow.log 5.锁信息 查看锁等待相关的阻塞线程、被阻塞线程信息及相关用户、IP、PORT SELECT locked_table, locked_index, locked_type, blocking_pid, ...
'/usr/local/mysql/data/'inSHOW VARIABLES 报错datadir默认是当前路径,show variables是/usr/local/mysql/data 查看数据库datadir的值:show global variables like '%datadir%'; 查看配置文件发现配置文件里没有datadir参数的定义,为配置文件添加上datadir=/usr/local/mysql/data ...
SHOW GLOBAL | SESSION VARIABLES – 显示MySQL系统变量信息 mysql> SHOW SESSION VARIABLES LIKE'%INNODB%';+---+---+ | Variable_name | Value | +---+---+ | ignore_builtin_innodb | OFF | | innodb_adaptive_flushing | ON | | innodb_adaptive_flushing_lwm |10| | innodb_adaptive_hash_index...
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_packet是否编辑成功 4)max_binlog_cache_size ...
“show” commands like “show configuration”. It is recommended to use the monitoring commands sparingly and only on need-basis. Configuration monitoring can drive high CPU usage and also spike the SCT CPU. Note that higher the configuration, higher the CPU ...
是MySQL提供的可以用来分析当前会话中语句执行的资源消耗情况的工具,可以用于sql调优的测量。默认是处于关闭状态的,会保存最近15次的运行结果。 2...查看状态:执行如下命令即可查看profile的状态: show variables like 'profiling'; ? 执行结果可以看到,现在是关闭