mysql进程和事物执行情况
去掉字段中的空格#去掉左边空格UPDATE user SET name=LTRIM(name);#去掉右边空格UPDATE user SET name=RTRIM(name);#去掉全部(左右)空格UPDATE user SET name=TRIM(name);## 查询和去掉换行符
示例: 需要将A列的数据修改为B的值,但数据保存再excl中,手动书写sql比较费时手动写sql 为:update test set name = 'b' where
出现错误:[ERROR] InnoDB: Unable to lock ./ibdata1 error: 11[Note] InnoDB: Check that you do not already have another
1) 修改配置my.cnfdatadir=/home/mysql #socket=/var/lib/mysql/mysql.sockpid-file=/var/run/mysqld/mysqld.pidsocket = /var/run/mysqld/mysql.socklog-error=/var/log/mysqld.log2)重新设置权限3)如果出错,关闭selinux...
Explain语法:explain select … from … [where …]例如:explain select * from news;输出:+----+-------------+-------+-------+-------------------+---------+---------+-------+------| id | select_type | table | ...
检查error log的时候发现大量warnings:[Warning]InnoDB Error Table mysql.innodb_index_stats not found[Warning]InnoDB Error Table mysql.innodb_table_stats not found[Warning]InnoDB Error Table mysql.slave_mas...
网上查找 (errno: 24) 是由于进程打开文件数过多引起的。 可以重启启动mysql /etc/init.d/mysqld start查看mysql进程打开的文件数 lsof -u mysql如果提示 -bash: lsof: command not found yum -y install lsof 安装后即可正常使用。解决方式:编辑MYsql配置文件my.cnf...
1)安装必要的组件yum install autoconf automake imake libxml2-devel expat-devel cmake gcc gcc-c++ libaio libaio-devel bzr bison libtool ncurses5-devel –y2)下载mysqlwget https://dev.mysql.com//Download...
mysqldump: Couldn't execute 'SHOW VARIABLES LIKE 'gtid\_mode'': Table 'performance_schema.session_variables' doesn't exist (1146)[root@localhost home]# mysql_upgrade -u root -p -h127.0.0.1 –force...
1)安装: http://www.percona.com/downloads/ 下载 Percona XtraBackup2)wget https://www.percona.com/downloads/Percona-XtraBackup-2.4/Percona-XtraBackup-2.4.13/binary/tarball/percona-xtrabackup-2.4.13-Lin...
1)下载mysql源安装包wget http://dev.mysql.com/get/mysql57-community-release-el7-8.noarch.rpm安装mysql源yum localinstall mysql57-community-release-el7-8.noarch.rpm2)检查mysql源是否安装成功yum repolist enabled | grep...
方法一,mysql导出#!/bin/bash# 删除14天之前的数据备份文件find /data/crm -mtime +14 -name '*.sql.gz' -exec rm -fr '{}' \; # 当前时间变量DATE=$(date +%Y%m%d)# 根据账号密码备份mysqldump -utest -ptest@2019 -h127.0.0.1 -P3376 ...
1)mysql官网下载源码https://dev.mysql.com/downloads/mysql/2)安装与配置文件在解压后的mysql包中新建 my.ini文件my.ini文件中需要添加的内容如下:[client]port=3306default-character-set=utf8[mysql]default-character-set=utf8...
原因:不能通过mysql .sock连接MySQL问题vim /etc/my.conf## 添加pid-file=/var/run/mysqld/mysqld.pidsocket = /var/run/mysqld/mysql.sock使用软连接ln -s /var/run/mysqld/mysql.sock /var/lib/mysql/mysql.sock...
mysql8.0在默认安装成功并启动后,navcat链接失败需要修改加密规则mysql> select host, user, authentication_string, plugin from user -> ;+-----------+------------------+----------------------------------------------...
mysql 5.7 安装后可能会出现Table 'performance_schema.session_variables',执行:[root@instance-xxxx ~]# mysql_upgrade -h172.17.0.1 -u root -p --force -P3306 sock=/var/lib/mysql/mysql3306.sock...
### 设置只读账号CREATE USER dbreader IDENTIFIED BY 'test';grant select on *.* to dbreader@"%" identified by "test";### 设置只读账号GRANT SElECT ON crmnew.* TO 'test'@'127.0.0.1' IDENTIFIED BY "test";####...
操作系统,centons71)配置mysql版本,操作系统 1、mysql版本一致; 2、启动mysql并修改root密码(自己能记住就行)2)修改主服务器master: #vim /etc/my.cnf [mysqld] log-bin=mysql-bin //[必须]启用二进制日志 server-id=98 //[必...
修改内容:vim /etc/init.d/mysql.server 添加--user=root 到 mysqld_safe
--从mysql5.7.6开始information_schema.global_status已经开始被舍弃,为了兼容性,此时需要打开 show_compatibility_562)character_set_database ,collation_database Value改为utf8,修改my.conf[client]default-character-set=utf8...
mysql出现这样的错误: [root@localhost /]# mysql -uroot -pEnter password: ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (2) 试下添加上 -h 命令 (带主机名参数)...
原因:MySQL 5.7.5及以上功能依赖检测功能。默认情况下启用ONLY_FULL_GROUP_BY SQL模式
1、查找mysql 安装rpm -qa | grep -i mysql2、删除yum remove mysql-*注意: 如果这样删除不了,就用查询出来的名称替换掉*号,逐个删除。
1.创建索引索引的创建可以在CREATE TABLE语句中进行,也可以单独用CREATE INDEX或ALTER TABLE来给表增加索引。以下命令语句分别提示了如何创建主键索引(PRIMARY KEY),联合索引(UNIQUE)和普通索引(INDEX)的方法。mysql>ALTER TABLE `table_name` ADD INDEX `index_name` (column ...
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