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标题：InnoDB: Database page corruption on disk or a failed file read of page恢复
作者：惜分飞©版权所有[未经本人同意,不得以任何形式转载,否则有进一步追究法律责任的权利.]
由于文件系统或者硬件故障导致mysql启动报错InnoDB: Database page corruption on disk or a failed file read of page
联系：手机/微信(+86 17813235971) QQ(107644445)
作者：惜分飞©版权所有[未经本人同意,不得以任何形式转载,否则有进一步追究法律责任的权利.]
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
联系：手机/微信(+86 17813235971) QQ(107644445)
作者：惜分飞©版权所有[未经本人同意,不得以任何形式转载,否则有进一步追究法律责任的权利.]
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)
通过分析.MYD文件确认数据依旧在文件中
mysql> select count(1) from db_bet_deleted; +----------+ | count(1) | +----------+ | 40158 | +----------+ 1 row in set (0.10 sec)
联系：手机/微信(+86 17813235971) QQ(107644445)
作者：惜分飞©版权所有[未经本人同意,不得以任何形式转载,否则有进一步追究法律责任的权利.]
有客户因为误操作删除了mysql的datadir目录,并且mysql数据库已经关闭(如果没有关闭可以采用类似方法:mysql 数据库目录被删除恢复),由于无法通过该方法直接处理,首先尝试文件系统层面进行恢复
联系：手机/微信(+86 17813235971) QQ(107644445)
作者：惜分飞©版权所有[未经本人同意,不得以任何形式转载,否则有进一步追究法律责任的权利.]
有客户找到我说mysql无法正常使用报错如下（库名.表名 doesn’t exist）:
2022-07-08T04:11:27.413455Z 0 [Note] /www/server/mysql/bin/mysqld (mysqld 5.7.34-log) starting as process 2144 ...
2022-07-08T04:11:27.495536Z 0 [Note] InnoDB: PUNCH HOLE support available
2022-07-08T04:11:27.495559Z 0 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins
2022-07-08T04:11:27.495562Z 0 [Note] InnoDB: Uses event mutexes
2022-07-08T04:11:27.495565Z 0 [Note] InnoDB: GCC builtin __atomic_thread_fence() is used for memory barrier
2022-07-08T04:11:27.495568Z 0 [Note] InnoDB: Compressed tables use zlib 1.2.11
2022-07-08T04:11:27.495571Z 0 [Note] InnoDB: Using Linux native AIO
2022-07-08T04:11:27.496130Z 0 [Note] InnoDB: Number of pools: 1
2022-07-08T04:11:27.496227Z 0 [Note] InnoDB: Using CPU crc32 instructions
2022-07-08T04:11:27.510618Z 0 [Note] InnoDB: Initializing buffer pool, total size=256M,instances=1,chunk size=128M
2022-07-08T04:11:27.520144Z 0 [Note] InnoDB: Completed initialization of buffer pool
2022-07-08T04:11:27.522095Z 0 [Note] InnoDB: If the mysqld execution user is authorized,
page cleaner thread priority can be changed. See the man page of setpriority().
2022-07-08T04:11:27.532135Z 0 [Note] InnoDB: The first innodb_system data file 'ibdata1' did not exist.
A new tablespace will be created!
2022-07-08T04:11:27.532259Z 0 [Note] InnoDB: Setting file '/www/server/data/ibdata1' size to 10 MB.
Physically writing the file full; Please wait ...
2022-07-08T04:11:27.760116Z 0 [Note] InnoDB: File '/www/server/data/ibdata1' size is now 10 MB.
2022-07-08T04:11:27.760338Z 0 [Note] InnoDB: Setting log file /www/server/data/ib_logfile101 size to 128MB
2022-07-08T04:11:27.760414Z 0 [Note] InnoDB: Progress in MB:
100
2022-07-08T04:11:28.940355Z 0 [Note] InnoDB: Setting log file /www/server/data/ib_logfile1 size to 128 MB
2022-07-08T04:11:28.940442Z 0 [Note] InnoDB: Progress in MB:
100
2022-07-08T04:11:30.517357Z 0 [Note] InnoDB: Renaming log file /www/server/data/ib_logfile101
to /www/server/data/ib_logfile0
2022-07-08T04:11:30.517394Z 0 [Warning] InnoDB: New log files created, LSN=45790
2022-07-08T04:11:30.517401Z 0 [Note] InnoDB: Creating shared tablespace for temporary tables
2022-07-08T04:11:30.517425Z 0 [Note] InnoDB: Setting file '/www/server/data/ibtmp1' size to 12 MB.
Physically writing the file full; Please wait ...
2022-07-08T04:11:30.609146Z 0 [Note] InnoDB: File '/www/server/data/ibtmp1' size is now 12 MB.
2022-07-08T04:11:30.609236Z 0 [Note] InnoDB: Doublewrite buffer not found: creating new
2022-07-08T04:11:30.631133Z 0 [Note] InnoDB: Doublewrite buffer created
2022-07-08T04:11:31.160847Z 0 [Note] InnoDB: 96 redo rollback segment(s) found.96 redo rollback segment(s) are active.
2022-07-08T04:11:31.160860Z 0 [Note] InnoDB: 32 non-redo rollback segment(s) are active.
2022-07-08T04:11:31.160970Z 0 [Warning] InnoDB: Creating foreign key constraint system tables.
2022-07-08T04:11:31.194147Z 0 [Note] InnoDB: Foreign key constraint system tables created
2022-07-08T04:11:31.194175Z 0 [Note] InnoDB: Creating tablespace and datafile system tables.
2022-07-08T04:11:31.195079Z 0 [Note] InnoDB: Tablespace and datafile system tables created.
2022-07-08T04:11:31.195098Z 0 [Note] InnoDB: Creating sys_virtual system tables.
2022-07-08T04:11:31.195974Z 0 [Note] InnoDB: sys_virtual table created
2022-07-08T04:11:31.196099Z 0 [Note] InnoDB: Waiting for purge to start
2022-07-08T04:11:31.246167Z 0 [Note] InnoDB: 5.7.34 started; log sequence number 0
2022-07-08T04:11:31.246379Z 0 [Note] Plugin 'FEDERATED' is disabled.
2022-07-08T04:11:31.248996Z 0 [Warning] InnoDB: Cannot open table mysql/plugin from the internal data dictionary
of InnoDB though the .frm file for the table exists.
Please refer to http://dev.mysql.com/doc/refman/5.7/en/innodb-troubleshooting.html for how to resolve the issue.
mysqld: Table 'mysql.plugin' doesn't exist
通过上述日志可以确认,数据库应该被重新初始化了,导致以前库的ibd和frm文件无法被正常访问.对于此类情况,可以参考以前类似恢复案例:frm和ibd文件数据库恢复
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