從完整備份恢復單個innodb表

如今大多數同窗在線上採起的備份策略都是xtrabackup全備+binlog備份,那麼當某天某張表意外的刪除那麼如何從xtrabackup全備中恢復呢?從mysql 5.6版本開始,支持可移動表空間(Transportable Tablespace)那麼利用這個功能就能夠實現單表的恢復,一樣利用這個功能還能夠把innodb表移動到另一臺服務器上。能夠參考:https://yq.aliyun.com/articles/59271mysql

下面進行從xtrabackup全備恢復單表的測試。sql

1. 開啓了參數innodb_file_per_table安全

2. 安裝工具:mysql-utilities,其中mysqlfrm能夠讀取表結構。服務器

yum install mysql-utilities -y

查看原表中的數據:app

mysql> select * from yayun.t1;
+------+------+
| id   | name |
+------+------+
|    1 | aa   |
|    2 | bb   |
|    3 | cc   |
|    4 | dd   |
+------+------+
4 rows in set (0.00 sec)

mysql> 

執行備份:ide

innobackupex --defaults-file=/data/mysql/3306/my.cnf --user=root --password=123 --sock=/data/mysql/3306/mysqltmp/mysql.sock /data/

apply-log工具

innobackupex --defaults-file=/data/mysql/3306/my.cnf --apply-log /data/2017-03-22_16-13-00/

刪除t1表:測試

mysql> use yayun
Database changed
mysql> drop table t1;
Query OK, 0 rows affected (0.13 sec)

mysql> 

讀取表結構spa

mysqlfrm --diagnostic /data/2017-03-22_16-13-00/yayun/t1.frm 

輸出:rest

# Reading .frm file for /data/2017-03-22_16-13-00/yayun/t1.frm:
# The .frm file is a TABLE.
# CREATE TABLE Statement:

CREATE TABLE `yayun`.`t1` (
  `id` int(11) DEFAULT NULL, 
  `name` char(180) DEFAULT NULL 
) ENGINE=InnoDB;

#...done.

建表:

mysql> use yayun
Database changed
mysql> CREATE TABLE `yayun`.`t1` (
    ->   `id` int(11) DEFAULT NULL, 
    ->   `name` char(180) DEFAULT NULL 
    -> ) ENGINE=InnoDB;
Query OK, 0 rows affected (0.08 sec)

mysql> 

加一個寫鎖,確保安全

mysql> lock tables t1 write;       
Query OK, 0 rows affected (0.00 sec)

mysql> 

丟棄表空間:

mysql> alter table t1 discard tablespace;       
Query OK, 0 rows affected (0.07 sec)

mysql> 

從備份中拷貝ibd文件,而且修改權限

[root@db_server_yayun_01 ~]# cp /data/2017-03-22_16-13-00/yayun/t1.ibd /data/mysql/3306/data/yayun/
[root@db_server_yayun_01 ~]# chown -R mysql.mysql /data/mysql/3306/data/yayun/t1.ibd 

載入表空間:

mysql> alter table t1 import tablespace;       
Query OK, 0 rows affected, 1 warning (0.15 sec)

mysql> show warnings;
+---------+------+------------------------------------------------------------------------------------------------------------------------------------------+
| Level   | Code | Message                                                                                                                                  |
+---------+------+------------------------------------------------------------------------------------------------------------------------------------------+
| Warning | 1810 | InnoDB: IO Read error: (2, No such file or directory) Error opening './yayun/t1.cfg', will attempt to import without schema verification |
+---------+------+------------------------------------------------------------------------------------------------------------------------------------------+
1 row in set (0.00 sec)

mysql> 

這裏有警告,能夠忽略。詳情能夠看:https://yq.aliyun.com/articles/59271
查詢數據是否一致:

mysql> select * from t1;
+------+------+
| id   | name |
+------+------+
|    1 | aa   |
|    2 | bb   |
|    3 | cc   |
|    4 | dd   |
+------+------+
4 rows in set (0.00 sec)

mysql> 

最後解鎖:

mysql> unlock tables;
Query OK, 0 rows affected (0.00 sec)

mysql> 

 

參考文章:

https://www.percona.com/blog/2017/03/15/restore-single-innodb-table-full-backup-accidentally-dropping/

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