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1 简介:Handler read *. 在对MySQL的Query进行调优时候，我们可以有效的使用EXPLAIN [EXTENDED ],SHOW PROFILE内置工具，但是通过这两个工具，得到的是比较粗糙的信息，我们无法得知MySQL到底是如何操作底层的数据。 A)获取Handler read *系类状态值命令 show session status like ‘Handler read%';. B)重置Handler read系列状态值命令:flush status;. 通过a)的命令，我们获取到Handler read *的状态有下面这些,下面会对这些进行一一解释以及测试. Handler read rnd next. Idx key 2 3. Test handler read info. Test handler read info v1. Test handler read info v1. Test handler read info v1. 3 解释:Handler read *. D Handler read next The number of requests to read ...

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DB爱好者 | databaseclub.com Reviews

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1 简介:Handler read *. 在对MySQL的Query进行调优时候，我们可以有效的使用EXPLAIN [EXTENDED ],SHOW PROFILE内置工具，但是通过这两个工具，得到的是比较粗糙的信息，我们无法得知MySQL到底是如何操作底层的数据。 A)获取Handler read *系类状态值命令 show session status like ‘Handler read%';. B)重置Handler read系列状态值命令:flush status;. 通过a)的命令，我们获取到Handler read *的状态有下面这些,下面会对这些进行一一解释以及测试. Handler read rnd next. Idx key 2 3. Test handler read info. Test handler read info v1. Test handler read info v1. Test handler read info v1. 3 解释:Handler read *. D Handler read next The number of requests to read ...

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1 mysql基础知识，mysql性能，mysql监控，mysql调优，mysql优化，mysql高可用

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db爱好者,mysql之handler read *详细讲解,下面是基础操作知识,handler read first,handler read last,handler read next,handler read prev,handler read rnd,handler read key,2 测试数据结构,t bl ddl data,shell,mysql,show,create,table,test handler,read,test handler read,null,default,into

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DB爱好者 | databaseclub.com Reviews

https://databaseclub.com

1 简介:Handler read *. 在对MySQL的Query进行调优时候，我们可以有效的使用EXPLAIN [EXTENDED ],SHOW PROFILE内置工具，但是通过这两个工具，得到的是比较粗糙的信息，我们无法得知MySQL到底是如何操作底层的数据。 A)获取Handler read *系类状态值命令 show session status like ‘Handler read%';. B)重置Handler read系列状态值命令:flush status;. 通过a)的命令，我们获取到Handler read *的状态有下面这些,下面会对这些进行一一解释以及测试. Handler read rnd next. Idx key 2 3. Test handler read info. Test handler read info v1. Test handler read info v1. Test handler read info v1. 3 解释:Handler read *. D Handler read next The number of requests to read ...

INTERNAL PAGES

databaseclub.com

1

Performance | DB爱好者

http://www.databaseclub.com/category/performance

Archive for the Performance Category. 1 简介:Handler read *. 在对MySQL的Query进行调优时候，我们可以有效的使用EXPLAIN [EXTENDED ],SHOW PROFILE内置工具，但是通过这两个工具，得到的是比较粗糙的信息，我们无法得知MySQL到底是如何操作底层的数据。 A)获取Handler read *系类状态值命令 show session status like ‘Handler read%';. B)重置Handler read系列状态值命令:flush status;. 通过a)的命令，我们获取到Handler read *的状态有下面这些,下面会对这些进行一一解释以及测试. Handler read rnd next. Idx key 2 3. Test handler read info. Test handler read info v1. Test handler read info v1. Test handler read info v1. 3 解释:Handler read *. D Handler rea...

2

快速修改MySQL表定义 | DB爱好者

http://www.databaseclub.com/2014/11/fast-ddl-tip

Mysql crate table Demo( - id int primary key, - name varchar(10) - engine=innodb;. Mysql create table Demo ugrade( - id int primary key, - name varchar(20) - engine=innodb; Query OK, 0 rows affected (0.19 sec). Mysql system cp /home/db/test/Demo.frm /home/db/test/Demo.frm.bak mysql system cp /home/db/test/Demo ugrade.frm /home/db/test/Demo.frm. Mysqladmin -uxxx -pxxxxx shutdown. Mysql -u xxx -pxxxxx. 切记在生产环境中谨慎使用，并且应在进行上面操作是进行锁表 (flush tables with read lock). On 十一月 17, 2014 by mars.he No Comments.

3

MySQL Explain执行计划Key_len长度探究 | DB爱好者

http://www.databaseclub.com/2015/02/key_len

Latin1和utf-8的表定义结构同这个一样，然后像表里面随意插入几条数据，好了，我插入的数值是1,”aaa”,上面的准备工作都做完了，看看执行的结果吧. Show explain for vharchar. Show explain for char. 1)当字段是char类型且不为Null时，Key len的长度是单字符字节数(Utf8=3,gbk=2,latin1=1)*字符数. 2)当字段是varchar类型且不为Null时，Key len的长度是单字符字节数(Utf8=3,gbk=2,latin1=1)*字符数 2. 3)当字段是char类型且为Null时，Key len的长度是 1)基础上 1. 4)当字段是varchar类型且为Null时，Key len的长度是 2)基础上 1. 从上面这个4条结果可以抽象出来下面的公式 Key len = 单字符字节数(Utf8=3,gbk=2,latin1=1)*字符数字符为是变长( 2) 字段是可以是Null(1). 本文连接地址 http:/ www.databaseclub.com/2015/02/key len/.

4

1）MySQL高可用专题之一(主从M-S复制) | DB爱好者

http://www.databaseclub.com/2015/08/ha-m-s

2、机器IP: MASTER:172.16.31.130 ，SLAVE:172.16.31.131. 从MySQL逛网获取二进制安装包，我下在的是mysql-5.6.17-linux-glibc2.5-x86 64.tar.gz，解压后复制到指定目录. 1 解压MySQL二进制安装包: tar zxvf mysql-5.6.17-linux-glibc2.5-x86 64.tar.gz. 2 将安装包移动到指定目录: mv mysql-5.6.17-linux-glibc2.5-x86 64 /usr/local/mysql. 3 建立MySQL用户组合账号: groupadd mysql & useradd -g mysql mysql. 4 修改二进制安装包的用户属性: chown -R mysql:mysql /usr/local/mysql. 6 启动数据库 /usr/local/mysql/bin/mysqld safe &. 1 在MASTER上 172.16.31.130 需要修改或者添加下面的参数. Read Master Log Pos. Relay Master Log File.

5

HA | DB爱好者

http://www.databaseclub.com/tag/ha

1721631.132 Mar.mars.he Master manager. 1721631.131 Feb.mars.he Slave[备主] node. 1721631.130 Jan.mars.he Slave node. 1721631.1 Main.mars.he Slave node. Tar -zxvf mysql-5.6.17-linux-glibc2.5-x86 64.tar.gz. Copy -r mysql-5.6.17-linux-glibc2.5-x86 64 /usr/local/mysql. Scripts/mysql install db - user=mysql - datadir=/usr/local/mysql/data - basedir=/usr/local/mysql. Hostname Main.mars.he. Vi /etc/hosts 在巡回地址后面添加上 Main.mars.he，修改之后是这个样子. 2 配置ssh免密码登陆配置Main.mars.he,其他的参考这台机器. Root@Main mysql]# ssh-key -t rsa [r...

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DB爱好者

1 简介:Handler read *. 在对MySQL的Query进行调优时候，我们可以有效的使用EXPLAIN [EXTENDED ],SHOW PROFILE内置工具，但是通过这两个工具，得到的是比较粗糙的信息，我们无法得知MySQL到底是如何操作底层的数据。 A)获取Handler read *系类状态值命令 show session status like ‘Handler read%';. B)重置Handler read系列状态值命令:flush status;. 通过a)的命令，我们获取到Handler read *的状态有下面这些,下面会对这些进行一一解释以及测试. Handler read rnd next. Idx key 2 3. Test handler read info. Test handler read info v1. Test handler read info v1. Test handler read info v1. 3 解释:Handler read *. D Handler read next The number of requests to read ...

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Login to My Account. Login To My Account. Login To My e-Statements. Midlothian - Main Street. Midlothian - 9th Street. Sign up for Mobile Banking. Login To My Account. Login To My e-Statements. Midlothian - Main Street. Midlothian - 9th Street. Sign up for Mobile Banking. Open Your CNB Of Texas Account Online. Get Your Instant Alerts. From purchases to payroll, you'll know as soon as we know. Take us with you wherever you go. Don't Just Bank,. Learn how CNB of Texas can m. Sign up for Mobile Banking.

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Login to My Account. Login To My Account. Login To My e-Statements. Midlothian - Main Street. Midlothian - 9th Street. Sign up for Mobile Banking. Login To My Account. Login To My e-Statements. Midlothian - Main Street. Midlothian - 9th Street. Sign up for Mobile Banking. Open Your CNB Of Texas Account Online. Get Your Instant Alerts. From purchases to payroll, you'll know as soon as we know. Take us with you wherever you go. Don't Just Bank,. Learn how CNB of Texas can m. Sign up for Mobile Banking.