: localhost User: root1 Select_priv: N Insert_priv: N Update_priv: N Delete_priv: N Create_priv: N Drop_priv: N Reload_priv: N Shutdown_priv: N ... 1 row in set ( sec) ###赋予root1账号所有权限 mysql> grant all privileges on *.* to 'root1'@'localhost' with grantoption;...
mysql 从物理文件中删除表 mysql linux table command mysql 物理删除表 无法启动了 mysql删除表卡死 这篇文章主要介绍怎么实现快速删除一个超过 100G 的大表,正常的我们都会执行命令 delete from test 来删除表。但是会有一个问题,就是执行 delete 命令之后,删除没有反应,一直卡顿在哪里。于是强制结束了执行并且...
delete from表名; #清空表中所有数据,但这张表没有删除,保留的是空表。 delete from表名where ...; #删除表中字段 ### 2)增加列 alter table表名ADD列名 列的属性(如INT NOT NULL COMMENT '注释说明') 3)修改列的类型信息。[ alter table表名CHANGE列名 新列名 新列属性; ] alter table表名CHANGE列...
ego (\G) Send command to MariaDB server, display result vertically. --控制结果显示为垂直显示 exit (\q) Exit mysql. Same as quit. --退出mysql go (\g) Send command to MariaDB server. --发送命令到mysql服务 help (\h) Display this help. nopager (\n) Disable pager, print to stdout....
2. ROW: 基于行的复制(row-based replication, RBR):不记录每一条SQL语句的上下文信息,仅需记录哪条数据被修改了,修改成了什么样子了。 优点:不会出现某些特定情况下的存储过程、或function、或trigger的调用和触发无法被正确复制的问题。 缺点:会产生大量的日志,尤其是alter table的时候会让日志暴涨。
语法:REVOKE privileges ON tablename FROM 'rolename'; 实例:REVOKE INSERT, UPDATE, DELETE ON school.* FROM 'school_write'; 删除角色 如果你删除了角色,那么用户也就失去了通过这个角色所获得的所有权限 。 语法:DROP ROLE role [,role2] ... ...
The DELETE statement deletes rows from table_name and returns the number of deleted rows. You can use ROW_COUNT() function to check the number of deleted rows. The conditions in the WHERE clause (optional) identify which rows to delete. ...
SELECT T1.VARIABLE_NAME, T1.VARIABLE_VALUE, T2.PROCESSLIST_ID, concat(T2.PROCESSLIST_USER,"@",T2.PROCESSLIST_HOST) AS 'User@Host', T2.PROCESSLIST_DB, T2.PROCESSLIST_COMMAND FROM PERFORMANCE_SCHEMA.VARIABLES_BY_THREAD T1, PERFORMANCE_SCHEMA.THREADS T2 WHERE T1.THREAD_ID = T2.THREAD_ID ...
status (\s) Get status information from the server. system (\!) Execute a system shell command. tee (\T) Set outfile [to_outfile]. Append everything into given outfile. use (\u) Use another database. Takes database name as argument. ...
(\g) Send command to mysql server.help (\h) Display this help.notee (\t) Don'twriteintooutfile.print(\p)Printcurrentcommand.prompt(\R)Changeyourmysqlprompt.quit(\q)Quitmysql.rehash(\#) Rebuild completion hash.source(\.)ExecuteanSQLscriptfile.Takesafilenameasanargument.status(\s)Get...