bitscn.com
今天有空尝试了一下mysqlhotcopy这个快速热备myisam引擎的工具。
(本文是针对单个服务器的情况，以后将会加入多服务器相关操作)
他和mysqldump的比较：
1、前者是一个快速文件意义上的copy，后者是一个数据库端的sql语句集合。
2、前者只能运行在数据库目录所在的机器上，后者可以用在远程客户端。
3、相同的地方都是在线执行lock tables 以及 unlock tables
4、前者恢复只需要copy备份文件到源目录覆盖即可，后者需要倒入sql文件到原来库中。(source 或者.或者 mysql 用mysqlhotcopy备份的步骤：
1、有没有perl-dbd模块安装
我的机器上：
[root@localhost data]# rpm -qa |grep perl-dbd | grep mysql
perl-dbd-mysql-3.0007-1.fc6
2、在数据库段分配一个专门用于备份的用户
mysql> grant select,reload,lock tables on *.* to hotcopyer@localhost identified by 123456;
query ok, 0 rows affected (0.00 sec)
mysql> flush privileges;
query ok, 0 rows affected (0.00 sec)
3、在/etc/my.cnf或者登陆用户的个人主文件.my.cnf里面添加
[mysqlhotcopy]
interactive-timeout
user=hotcopyer
password=123456
port=3306
4、开始备份。
[root@localhost ~]# mysqlhotcopy t_girl t_girl_new
locked 4 tables in 0 seconds.
flushed tables (`t_girl`.`category`, `t_girl`.`category_part`, `t_girl`.`id`, `t_girl`.`parent`) in 0 seconds.
copying 22 files...
copying indices for 0 files...
unlocked tables.
mysqlhotcopy copied 4 tables (22 files) in 5 seconds (5 seconds overall).
备份后的目录：
[root@localhost data]# du -h | grep t_girl
213m ./t_girl
213m ./t_girl_copy
[root@localhost ~]#
5、mysqlhotcopy用法详解。
1)、mysqlhotcopy 原数据库名，新数据库名
[root@localhost ~]# mysqlhotcopy t_girl t_girl_new
locked 4 tables in 0 seconds.
flushed tables (`t_girl`.`category`, `t_girl`.`category_part`, `t_girl`.`id`, `t_girl`.`parent`) in 0 seconds.
copying 22 files...
copying indices for 0 files...
unlocked tables.
mysqlhotcopy copied 4 tables (22 files) in 5 seconds (5 seconds overall).
2)、mysqlhotcopy 原数据库名，备份的目录
[root@localhost ~]# mysqlhotcopy t_girl /tmp/
locked 4 tables in 0 seconds.
flushed tables (`t_girl`.`category`, `t_girl`.`category_part`, `t_girl`.`id`, `t_girl`.`parent`) in 0 seconds.
copying 22 files...
copying indices for 0 files...
unlocked tables.
mysqlhotcopy copied 4 tables (22 files) in 6 seconds (6 seconds overall).
3)、对单个表支持正则表达式
(除了id 表外)
[root@localhost data]# mysqlhotcopy t_girl./~id/
using copy suffix _copy
locked 3 tables in 0 seconds.
flushed tables (`t_girl`.`category`, `t_girl`.`category_part`, `t_girl`.`parent`) in 0 seconds.
copying 19 files...
copying indices for 0 files...
unlocked tables.
mysqlhotcopy copied 3 tables (19 files) in 6 seconds (6 seconds overall).
[root@localhost data]#
4)、可以把记录写到专门的表中。具体察看帮助。
perldoc mysqlhostcopy
mysql> create database hotcopy;
query ok, 1 row affected (0.03 sec)
mysql> use hotcopy
database changed
mysql> create table checkpoint(time_stamp timestamp not null,src varchar(32),dest varchar(60), msg varchar(255));
query ok, 0 rows affected (0.01 sec)
同时记得给hotcopyer用户权限。
mysql> grant insert on hotcopy.checkpoint to hotcopyer@localhost;
query ok, 0 rows affected (0.00 sec)
mysql> flush privileges;
query ok, 0 rows affected (0.00 sec)
mysql> q
bye
重复第三步的操作
[root@localhost ~]# mysqlhotcopy t_girl./~id/ --allowold --checkpoint hotcopy.checkpoint
using copy suffix _copy
existing hotcopy directory renamed to /usr/local/mysql/data/t_girl_copy_old
locked 3 tables in 0 seconds.
flushed tables (`t_girl`.`category`, `t_girl`.`category_part`, `t_girl`.`parent`) in 0 seconds.
copying 19 files...
copying indices for 0 files...
unlocked tables.
mysqlhotcopy copied 3 tables (19 files) in 12 seconds (13 seconds overall).
默认保存在数据目录下/t_girl_copy/
看看记录表。
mysql> use hotcopy;
database changed
mysql> select * from checkpoint;
+---------------------+--------+-----------------------------------+-----------+
| time_stamp | src | dest | msg |
+---------------------+--------+-----------------------------------+-----------+
| 2008-03-11 14:44:58 | t_girl | /usr/local/mysql/data/t_girl_copy | succeeded |
+---------------------+--------+-----------------------------------+-----------+
1 row in set (0.00 sec)
5)、支持增量备份。
[root@localhost ~]# mysqlhotcopy t_girl./~id/ --allowold --checkpoint hotcopy.checkpoint --addtodest t_girl_new
locked 3 tables in 0 seconds.
flushed tables (`t_girl`.`category`, `t_girl`.`category_part`, `t_girl`.`parent`) in 0 seconds.
copying 19 files...
copying indices for 0 files...
unlocked tables.
mysqlhotcopy copied 3 tables (19 files) in 7 seconds (7 seconds overall).
6)、其它的等待测试过了再发布。。。
bitscn.com