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。本文主要描述myloader的使用方法并给出示例。
有关mydumper的相关参考 mydumper备份mysql数据库示例 mydumper安装及安装故障汇总 1、单库的备份与恢复 [root@app ~]# mydumper -u leshami -p xxx -B sakila -o /tmp/bak [root@app ~]# mysql -urobin -pxxx -e "show databases"|grep restoredb [root@app ~]# mysql -urobin -pxxx \ > -e "create table sakila.tb like sakila.actor; ###创建测试表 > insert into sakila.tb select * from sakila.actor"
###将备份库恢复到一个新数据库,如restoredb [root@app ~]# myloader -u leshami -p xxx -B restoredb -d /tmp/bak [root@app ~]# mysql -urobin -pxxx -e "show databases"|grep restoredb restoredb
###恢复到原库 [root@app ~]# 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
---增加-o参数进行覆盖恢复 [root@app ~]# myloader -u leshami -p xxx -o -B sakila -d /tmp/bak
2、单表恢复 [root@app ~]# mysql -urobin -pxxx -e "drop table sakila.tb" [root@app ~]# 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以及数据文件执行即可 [root@app ~]# mysql -urobin -pxxx \ > -e "use sakila; > source /tmp/bak/sakila.tb-schema.sql > source /tmp/bak/sakila.tb.sql"
###验证结果 [root@app ~]# 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 [root@app ~]# rm -rf /tmp/bak/* [root@app ~]# mydumper -u leshami -p xxx --regex '^(?!(mysql|test))' -o /tmp/bak
###尝试删除部分数据库 [root@app ~]# mysql -urobin -pxxx \ > -e "drop database tempdb;drop database sakila"
###基于全部备份文件进行恢复 [root@app ~]# myloader -u leshami -p xxx -o -d /tmp/bak
4、获取帮助 [root@app ~]# 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