mysql获取帮助
查看配置参数：SHOW VARIABLES LIKE '%timeout%'
2)MySQL客户端工具自带的帮助
? (\?) 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，
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 . 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 . 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.
3、服务端的相关帮助
--获取服务器管理相关的帮助，输入help contents
mysql> help contents;
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