myloader恢複mysql資料庫示例



    mydumper是針對mysql資料庫備份的一個輕量級第三方的開源工具，備份方式為邏輯備份。它支援多線程，備份速度遠高于原生态的mysqldump以及衆多優異特性。與其相配套的恢複工具則是myloader，主要用于将dump出來的sql以并行的方式進行恢複。本文主要描述myloader的使用方法并給出示例。

    有關mydumper的相關參考

1、單庫的備份與恢複

[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;             ###建立測試表

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

###将備份庫恢複到一個新資料庫，如restoredb

[root@app ~]# myloader  -u leshami -p xxx  -B restoredb -d /tmp/bak

restoredb

###恢複到原庫

[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參數進行覆寫恢複

[root@app ~]# myloader  -u leshami -p xxx   -o -B sakila -d /tmp/bak

2、單表恢複

[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

###直接調用備份的schema以及資料檔案執行即可

>  -e "use sakila;

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

>      source /tmp/bak/sakila.tb.sql"

###驗證結果

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

| count(*) |

|      200 |

3、執行個體級别的備份與恢複

[root@app ~]# rm -rf /tmp/bak/*

[root@app ~]# mydumper -u leshami -p xxx   --regex '^(?!(mysql|test))' -o /tmp/bak

###嘗試删除部分資料庫

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

###基于全部備份檔案進行恢複

[root@app ~]# myloader  -u leshami -p xxx   -o -d /tmp/bak

4、擷取幫助

[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

                   還原期間每個事務insert的數目，預設是1k

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

  -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