Linux centos 6 mysql 配置文件说明
在软件包rpm中安装mysql时，其中在文件夹usr/share/doc/mysql-server5.16中就有五个文件，这些文件就在默认下根据使用内在的大小提供的五种级别的配置标准。
下面是my-midiumf配置文件的详细说明。更多详细内容，可以进“潘田博客”查相关文章。
# Example MySQL config file for medium systems.
#
# This is for a system with little memory (32M - 64M) where MySQL plays
# an important part, or systems up to 128M where MySQL is used together with # other programs (such as a web server)
#
# MySQL programs look for option files in a set of
# locations which depend on the deployment platform.
# You can copy this option file to one of those
# locations. For information about these locations, see:
# sql/doc/mysql/en/option-files.html
#
# In this file, you can use all long options that a program supports.
# If you want to know which options a program supports, run the program
# with the "--help" option.
# The following options will be passed to all MySQL clients
[client]  // 在mysql命令下链接数据库时用的默认值
#password = your_password  // 登录时的默认密码，默认配置中无效
port = 3306  //默认端口是3306
socket  = /var/lib/mysql/mysql.sock //mysq socket连接的文件;
# Here follows entries for some specific programs
# The MySQL server
[mysqld] //这块是mysql服务器配置指令
port = 3306 //mysql 服务器监听的端口号 ，默认3306
socket  = /var/lib/mysql/mysql.sock //socket链接文件
skip-locking //外部数据锁
key_buffer_size = 16M //索引区的RMA内在大小默认是8M，现在是16M
max_allowed_packet = 1M //系统最大的缓冲区值
table_open_cache = 64 //表高速缓存区的大小
sort_buffer_size = 512K //排序高速缓存的大小
net_buffer_length = 8K //指定链接缓冲区与结果缓冲区的初始大小
read_buffer_size = 256K //读表操作缓冲区的大小
read_rnd_buffer_size = 512K //随机排序的缓冲区大小
myisam_sort_buffer_size = 8M //
# Don't listen on a TCP/IP port at all. This can be a security enhancement, # if all processes that need to connect to mysqld run on the same host.
# All interaction with mysqld must be made via Unix sockets or named pipes. # Note that using this option without enabling named pipes on Windows
# (via the "enable-named-pipe" option) will render mysqld useless!
#
#skip-networking //不能过TCP网络与客户端链接，而是通过socket进行链接
# Replication Master Server (default)
# binary logging is required for replication
log-bin=mysql-bin //用于设置二进制的日志文件名，日志文件可用于数据恢复到最后状态
# binary logging format - mixed recommended
binlog_format=mixed
# required unique id between 1 and 2^32 - 1
# defaults to 1 if master-host is not set
# but will not function as a master if omitted
server-id = 1 //设置服务器进程的id号，在设置主从服务器时用到
# Replication Slave (comment out master section to use this)
#
# To configure this host as a replication slave, you can choose between
# two methods :
#
# 1) Use the CHANGE MASTER TO command (fully described in our manual) -
#    the syntax is:
#
#    CHANGE MASTER TO MASTER_HOST=<host>, MASTER_PORT=<port>,
#    MASTER_USER=<user>, MASTER_PASSWORD=<password> ;
#
#    where you replace <host>, <user>, <password> by quoted strings and
#    <port> by the master's port number (3306 by default).
#
#    Example:
#
#    CHANGE MASTER TO MASTER_HOST='125.564.12.1', MASTER_PORT=3306,
#    MASTER_USER='joe', MASTER_PASSWORD='secret';
#
# OR
#
# 2) Set the variables below. However, in case you choose this method, then
#    start replication for the first time (even unsuccessfully, for example #    if you mistyped the password in master-password and the slave fails to #    connect), the slave will create a master.info file, and any later
#    change in this file to the variables' values below will be ignored and #    overridden by the content mysql下载之后是个文件夹
of the master.info file, unless you shutdown #    the slave server, delete master.info and restart the slaver server.
#    For that reason, you may want to leave the lines below untouched
#    (commented) and instead use CHANGE MASTER TO (see above)
#
# required unique id between 2 and 2^32 - 1
# (and different from the master)
# defaults to 2 if master-host is set
# but will not function as a slave if omitted
#server-id      = 2
#
# The replication master for this slave - required
#master-host    =  <hostname>
#
# The username the slave will use for authentication when connecting
# to the master - required
#master-user    =  <username>
#
# The password the slave will authenticate with when connecting to
# the master - required
#master-password =  <password>
#
# The port the master is listening on.
# optional - defaults to 3306
#master-port    =  <port>
#
# binary logging - not required for slaves, but recommended
#log-bin=mysql-bin
# Uncomment the following if you are using InnoDB tables
#innodb_data_home_dir = /var/lib/mysql
#innodb_data_file_path = ibdata1:10M:autoextend
#innodb_log_group_home_dir = /var/lib/mysql
# You can set .._buffer_pool_size up to 50 - 80 %
# of RAM but beware of setting memory usage too high
#innodb_buffer_pool_size = 16M
#innodb_additional_mem_pool_size = 2M
# Set .._log_file_size to 25 % of buffer pool size
#innodb_log_file_size = 5M
#innodb_log_buffer_size = 8M
#innodb_flush_log_at_trx_commit = 1
#innodb_lock_wait_timeout = 50
[mysqldump] //mysqldump工具使用的配置
Quick //表示支持较大的数据库的转存
max_allowed_packet = 16M //数据表转存包的最大值
[mysql] //启动mysql服务的配置
no-auto-rehash //些选项让服务器较快的启动
# Remove the next comment character if you are not familiar with SQL #safe-updates //启用安全更新功能
[myisamchk] //指定使用smchk工具所修复表时的配置
key_buffer_size = 20M //存放索引块缓冲区的大小
sort_buffer_size = 20M 设置排序时所用的缓冲区的大小
read_buffer = 2M 读操作时所使用的缓冲区的大小
write_buffer = 2M 写操作时所使用的缓冲区的大小
[mysqlhotcopy] 采用热贝时使用的工具
interactive-timeout 热贝时的最大超时时间，默认2880S

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