MySQL中怎么实现延时备份

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MySQL 中怎么实现延时备份，相信很多没有经验的人对此束手无策，为此本文总结了问题出现的原因和解决方法，通过这篇文章希望你能解决这个问题。

1、 maatkit 工具集简介

maatkit 是一个包括多个实用 MySQL 的工具集，使用它们，可以让你的 MySQL 服务器使用起来更加方便也更加安全。maatkit 是开源的软件, 你可以自由的改进软件并将自己作出的改进版本向社会发行传播。

maatkit 工具目前包含 26 个不同功能的工具。

主要有：

mk-archiver,mk-audit,mk-find,mk-kill,mk-heartbeat,mk-query-digest,mk-parallel-dump,mk-parallel-restore,mk-show-grants ,mk-slave-delay,mk-slave-move,mk-slave-restart 等工具。

顾名思义 mk-slave-delay 是延时备份工具。mk-slave-delay 控制 MySQL slave 端，使它滞后于其 master。

2、 maatkit 安装
:http://code.google.com/p/maatkit/

安装步骤：

tar -zxf maatkit- version .tar.gz

cd maatkit- version

perl Makefile.PL

make install

###

# make install

hellip;.

Installing /usr/bin/mk-index-usage

Installing /usr/bin/mk-slave-delay

Installing /usr/bin/mk-archiver

Installing /usr/bin/mk-checksum-filter

Installing /usr/bin/mk-slave-prefetch

Installing /usr/bin/mk-log-player

Installing /usr/bin/mk-query-profiler

Installing /usr/bin/mk-slave-move

Installing /usr/bin/mk-query-digest

Installing /usr/bin/mk-show-grants

Installing /usr/bin/mk-parallel-restore

Installing /usr/bin/mk-profile-compact

Installing /usr/bin/mk-find

Installing /usr/bin/mk-table-checksum

Installing /usr/bin/mk-fifo-split

Installing /usr/bin/mk-error-log

Installing /usr/bin/mk-visual-explain

Installing /usr/bin/mk-variable-advisor

Installing /usr/bin/mk-kill

Installing /usr/bin/mk-heartbeat

Installing /usr/bin/mk-purge-logs

Installing /usr/bin/mk-query-advisor

Installing /usr/bin/mk-parallel-dump

Installing /usr/bin/mk-merge-mqd-results

Installing /usr/bin/mk-duplicate-key-checker

Installing /usr/bin/mk-upgrade

Installing /usr/bin/mk-deadlock-logger

Installing /usr/bin/mk-slave-restart

Installing /usr/bin/mk-slave-find

Installing /usr/bin/mk-loadavg

Installing /usr/bin/mk-table-sync

3、文档帮助
man /usr/bin/mk-slave-delay

/usr/bin/mk-slave-delay ndash;help

4、 mk-slave-delay 使用
示例：

mk-slave-delay ndash;delay 1m ndash;interval 15s ndash;run-time 10m slavehost

延时运行 10 分钟，slave 滞后 master1 分钟,15 秒检查下次延时情况。

详细参数说明：

Usage: mk-slave-delay [OPTION…] SLAVE-HOST [MASTER-HOST]

Options:

ndash;ask-pass Prompt for a password when connecting to MySQL

ndash;charset=s -A Default character set

ndash;config=A Read this comma-separated list of config files; if

specified, this must be the first option on the command

line

ndash;[no]continue Continue replication normally on exit (default yes)

ndash;daemonize Fork to the background and detach from the shell

ndash;defaults-file=s -F Only read options from the given file

ndash;delay=m How far the slave should lag its master (default 1h).

Optional suffix s=seconds, m=minutes, h=hours, d=days;

if no suffix, s is used.

ndash;help Show help and exit

ndash;host=s -h Connect to host

ndash;interval=m How frequently mk-slave-delay should check whether the

slave needs to be started or stopped (default 1m).

Optional suffix s=seconds, m=minutes, h=hours, d=days;

if no suffix, s is used.

ndash;log=s Print all output to this file when daemonized

ndash;password=s -p Password to use when connecting

ndash;pid=s Create the given PID file when daemonized

ndash;port=i -P Port number to use for connection

ndash;quiet -q Don rsquo;t print informational messages about operation

ndash;run-time=m How long mk-slave-delay should run before exiting.

Optional suffix s=seconds, m=minutes, h=hours, d=days;

if no suffix, s is used.

ndash;set-vars=s Set these MySQL variables (default wait_timeout=10000)

ndash;socket=s -S Socket file to use for connection

ndash;use-master Get binlog positions from master, not slave

ndash;user=s -u User for login if not current user

ndash;version Show version and exit

5、延时原理
mk-slave-delay 定时地 starts /stops slave 的 sql_thread, 以使其达到滞后 master 的目的。

2011-02-15T14:46:19 START SLAVE until master 2011-02-15T06:46:17 apollo226-bin.000290/779116659

2011-02-15T14:46:19 START SLAVE until master 2011-02-15T06:46:18 apollo226-bin.000290/781852897

6、应用布署
脚本 my_slave_delay.sh 集中控制延时备份 DB 服务器.

服务器信息以 host_ip port 的格式存在 delay_host 配置文件中。

head delay_host.txt

10.xx.xx.xxx 3601

usage1: sh my_slave_delay.sh

usage2: sh my_slave_delay.sh [delay_host] [delay] [interval]

my_slave_delay 核心代码：

delay_host=$1

delay_host=${delay_host:-”delay_host.txt”}

delay=$2

delay=${delay:-”8h”}

interval=$3

interval=${interval:-”2m”}

log_file=”my_slave_delay.log”

my_slave_delay(){

cat $delay_host |grep -v lsquo;# rsquo; | while read host port

do

echo”/usr/bin/mk-slave-delay -h $host -P $port ndash;interval=$interval ndash;delay=$delay”

echo”/usr/bin/mk-slave-delay -h $host -P $port ndash;interval=$interval ndash;delay=$delay”$log_file

/usr/bin/mk-slave-delay -h $host -P $port ndash;interval=$interval ndash;delay=$delay

sleep 1

done

}

### 取消延时

my_slave_start(){

echo“my_slave_start”

ps aux |grep“mk-slave-delay -h”-i |grep -v“grep”| awk lsquo;{print $2,$14,$16} rsquo; | while read pid host port ;

do

echo“stop slave delay $host:$port

kill -9 $pid

echo“slave start sql_thread $host:$port”

echo“slave start sql_thread;”| mysql -h $host -P$port -N

done;

echo“my_slave_start done.”

}