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mydumper是针对mysql数据库备份的一个轻量级第三方的开源工具。备份方式为逻辑备份。它支持多线程。备份速度远高于原生态的mysqldump以及众多优异特性。与其相配套的恢复工具则是myloader。主要用于将dump出来的sql以并行的方式进行恢复。

本文主要描写叙述myloader的用法并给出演示样例。

有关mydumper的相关參考

mydumper备份mysql数据库演示样例

mydumper安装及安装故障汇总

1、单库的备份与恢复

[[email protected] ~]# mydumper -u leshami -p xxx -B sakila -o /tmp/bak

[[email protected] ~]# mysql -urobin -pxxx   -e "show databases"|grep restoredb

[[email protected] ~]# mysql -urobin -pxxx   \

>  -e "create table sakila.tb like sakila.actor;             ###创建測试表

>      insert into sakila.tb select * from sakila.actor"

###将备份库恢复到一个新数据库，如restoredb

[[email protected] ~]# myloader  -u leshami -p xxx  -B restoredb -d /tmp/bak

[[email protected] ~]# mysql -urobin -pxxx   -e "show databases"|grep restoredb

restoredb

###恢复到原库

[[email protected] ~]# myloader  -u leshami -p xxx   -B sakila -d /tmp/bak

** (myloader:3642): CRITICAL **: Error restoring sakila.category from file sakila.category-schema.sql: Table ‘category‘ already exists

---添加-o參数进行覆盖恢复

[[email protected] ~]# myloader  -u leshami -p xxx   -o -B sakila -d /tmp/bak

2、单表恢复

[[email protected] ~]# mysql -urobin -pxxx   -e "drop table sakila.tb"

[[email protected] ~]# mysql -urobin -pxxx   -e "select count(*) from sakila.tb"

Warning: Using a password on the command line interface can be insecure.

ERROR 1146 (42S02) at line 1: Table ‘sakila.tb‘ doesn‘t exist

###直接调用备份的schema以及数据文件运行就可以

[[email protected] ~]# mysql -urobin -pxxx   \

>  -e "use sakila;

>      source /tmp/bak/sakila.tb-schema.sql

>      source /tmp/bak/sakila.tb.sql"

###验证结果

[[email protected] ~]# mysql -urobin -pxxx   -e "select count(*) from sakila.tb"

Warning: Using a password on the command line interface can be insecure.

+----------+

| count(*) |

+----------+

|      200 |

+----------+

3、实例级别的备份与恢复[[email protected] ~]# rm -rf /tmp/bak/*

[[email protected] ~]# mydumper -u leshami -p xxx   --regex ‘^(?

!(mysql|test))‘ -o /tmp/bak

###尝试删除部分数据库

[[email protected] ~]# mysql -urobin -pxxx   \

>  -e "drop database tempdb;drop database sakila"

###基于所有备份文件进行恢复

[[email protected] ~]# myloader  -u leshami -p xxx   -o -d /tmp/bak

4、获取帮助[[email protected] ~]# myloader --help

Usage:

myloader [OPTION...] multi-threaded MySQL loader

Help Options:

-?, --help                        Show help options

Application Options:

-d, --directory                   Directory of the dump to import

-q, --queries-per-transaction     Number of queries per transaction, default 1000

还原期间每一个事务insert的数目，缺省是1k

-o, --overwrite-tables            Drop tables if they already exist(表存在即覆盖)

-B, --database                    An alternative database to restore into

-e, --enable-binlog               Enable binary logging of the restore data

-h, --host                        The host to connect to

-u, --user                        Username with privileges to run the dump

-p, --password                    User password

-P, --port                        TCP/IP port to connect to

-S, --socket                      UNIX domain socket file to use for connection

-t, --threads                     Number of threads to use, default 4

-C, --compress-protocol           Use compression on the MySQL connection

-V, --version                     Show the program version and exit

-v, --verbose                     Verbosity of output, 0 = silent, 1 = errors, 2 = warnings, 3 = info, default 2