如何获取MySQL帮助信息
在开发或测试环境在碰到MySQL相关故障时，大多数朋友可能会通过论坛发帖，QQ群讨论方式来获取帮助。该方式是获取帮助的有效途径之
在开发或测试环境在碰到MySQL相关故障时，大多数朋友可能会通过论坛发帖，QQ群讨论方式来获取帮助。该方式是获取帮助的有效途径之一。然而如果在生产环境，在没有网络的环境下，这些方式就无助于问题的解决。无论何种数据库，从官方网站获取帮助是最直接最有效的方式。其次没有网络的环境下，我们可以通过MySQL客户端工具自带的帮助信息来解决问题。
1)MySQL官方手册
和Oracle官方文档一下，MySQL官方手册是获取MySQL帮助最直接最效的方式。该手册包含很多个部分，比如有关SQL的语法，MySQL安装方式，MySQL的系统变量，状态变量，命令行的常用工具，数据库的管等等。总之是一个MySQL数据相关的大合集。支持PDF及html方式下载。
下载位置：
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Ubuntu 14.04下安装MySQL
《MySQL权威指南(原书第2版)》清晰中文扫描版 PDF
Ubuntu 14.04 LTS 安装 LNMP Nginx\PHP5 (PHP-FPM)\MySQL
Ubuntu 14.04下搭建MySQL主从服务器
Ubuntu 12.04 LTS 构建高可用分布式 MySQL 集群
Ubuntu 12.04下源代码安装MySQL5.6以及Python-MySQLdb
MySQL-5.5.38通用二进制安装
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2)MySQL客户端工具自带的帮助
获取mysql有关的帮助信息，直接在mysql提示符下输入help即可获得有关在mysql客户端相关的帮助信息。
这个方式与Oracle SQL*plus下的help 是类似的。
mysql> help
For information about MySQL products and services, visit:
For developer information, including the MySQL Reference Manual, visit:
To buy MySQL Enterprise support, training, or other products, visit:
https://shop.mysql.com/
List of all MySQL commands:
Note that all text commands must be first on line and end with ';'
? (\?) Synonym for `help'.
clear (\c) Clear the current input statement. --清除当前输入的语句
connect (\r) Reconnect to the server. Optional arguments are db and host. --重新连接，通常用于被剔除或异常断开后重新连接，SQL*plus下也有这样一个connect命令
delimiter (\d) Set statement delimiter. --设置命令终止符，缺省为；，比如我们可以设定为/来表示语句结束
edit (\e) Edit command with $EDITOR. --编辑缓冲区的上一条SQL语句到文件，缺省调用vi，文件会放在/tmp路径下
ego (\G) Send command to mysql 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 mysql server. --发送命令到mysql服务
help (\h) Display this help.
nopager (\n) Disable pager, print to stdout. --关闭页设置，打印到标准输出
notee (\t) Don't write into outfile. --关闭输出到文件
pager (\P) Set PAGER [to_pager]. Print the query results via PAGER. --设置pager方式，可以设置为调用more,less等等，主要是用于分页显示
print (\p) Print current command.
prompt (\R) Change your mysql prompt. --改变mysql的提示符
quit (\q) Quit mysql.
rehash (\#) Rebuild completion hash. --自动补齐相关对象名字
source (\.) Execute an SQL script file. Takes a file name as an argument. --执行脚本文件
status (\s) Get status information from the server. --获得状态信息
system (\!) Execute a system shell command. --执行系统命令
tee (\T) Set outfile [to_outfile]. Append everything into given outfile.--操作结果输出到文件
use (\u) Use another database. Takes database name as argument. --切换数据库
charset (\C) Switch to another charset. Might be needed for processing binlog with multi-byte charsets. --设置字符集
warnings (\W) Show warnings after every statement. --打印警告信息
nowarning (\w) Don't show warnings after every statement.
--上面的所有命令，扩号内的为快捷操作，即只需要输入“\”+ 字母即可执行
For server side help, type 'help contents' --注意这里的描述help contents将获得服务器端的相关帮助信息
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