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友情链接
分类目录归档:MySQL恢复
InnoDB: Database page corruption on disk or a failed file read of page恢复
MySQL 8.0版本ibd文件恢复
对于单个的ibd文件,大部分情况下可以通过DISCARD TABLESPACE和IMPORT TABLESPACE方式进行恢复
mysql> use test; Reading table information for completion of table and column names You can turn off this feature to get a quicker startup with -A Database changed mysql> CREATE TABLE `t1` ( -> `id` int DEFAULT NULL -> ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci; Query OK, 0 rows affected (0.01 sec) mysql> insert into t1 values(1); Query OK, 1 row affected (0.02 sec) mysql> insert into t1 values(2); Query OK, 1 row affected (0.01 sec) mysql> insert into t1 values(3); Query OK, 1 row affected (0.00 sec)
关闭mysql服务,备份mysql中的t1.ibd文件
[root@xifenfei ~]# service mysql stop Shutting down MySQL..... SUCCESS! [root@xifenfei test]# cp t1.ibd t1_bak
启动mysql服务,并删除并创建新的t1表(表结构相同)
[root@xifenfei test]# service mysql start Starting MySQL..................... SUCCESS! [root@xifenfei test]# mysql -uroot -poracle test mysql: [Warning] Using a password on the command line interface can be insecure. Reading table information for completion of table and column names You can turn off this feature to get a quicker startup with -A Welcome to the MySQL monitor. Commands end with ; or \g. Your MySQL connection id is 8 Server version: 8.0.31 MySQL Community Server - GPL Copyright (c) 2000, 2022, Oracle and/or its affiliates. Oracle is a registered trademark of Oracle Corporation and/or its affiliates. Other names may be trademarks of their respective owners. Type 'help;' or '\h' for help. Type '\c' to clear the current input statement. mysql> drop table t1; Query OK, 0 rows affected (0.20 sec) mysql> mysql> CREATE TABLE `t1` ( -> `id` int DEFAULT NULL -> ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci; Query OK, 0 rows affected (0.01 sec)
DISCARD TABLESPACE操作
mysql> ALTER TABLE t1 DISCARD TABLESPACE; Query OK, 0 rows affected (0.01 sec)
把备份的t1.ibd还原回去并修改权限
[root@xifenfei test]# mv t1_bak t1.ibd [root@xifenfei test]# ls -ltr total 112 -rw-r-----. 1 root root 114688 Dec 18 17:24 t1.ibd [root@xifenfei test]# chown mysql.mysql t1.ibd
IMPORT TABLESPACE并验证数据
mysql> ALTER TABLE t1 IMPORT TABLESPACE; Query OK, 0 rows affected, 1 warning (0.24 sec) mysql> select * from t1; +------+ | id | +------+ | 1 | | 2 | | 3 | +------+ 3 rows in set (0.00 sec)
在恢复途中如果遇到表定义不对,或者ibd文件损坏,或者版本不匹配等各种情况,可能在IMPORT TABLESPACE的时候可能出现类似ERROR 1808 (HY000): Schema mismatch (Clustered index validation failed. Because the .cfg file is missing, table definition of the IBD file could be different. Or the data file itself is already corrupted.)错误
mysql> alter table `t1` import tablespace; ERROR 1808 (HY000): Schema mismatch (Clustered index validation failed. Because the .cfg file is missing, table definition of the IBD file could be different. Or the data file itself is already corrupted.)
如果出现此类错误,无法直接通过该方法进行解决,参考frm和ibd文件数据库恢复,使用专业恢复工具进行处理
MyISAM表delete记录恢复
有客户delete删除了myisam表中的部分数据,本来表中4-5w条记录,删除之后值剩余几十条,希望对其进行恢复(该库没有开启binlog)
mysql> select count(1) from db_bet; +----------+ | count(1) | +----------+ | 46 | +----------+ 1 row in set (0.00 sec)
通过工具对其删除操作分析,找到记录如下

对其记录入库确认
mysql> select count(1) from db_bet_deleted; +----------+ | count(1) | +----------+ | 40158 | +----------+ 1 row in set (0.10 sec)