记一次停电引起的mysql无法启动

本文详细介绍了InnoDB恢复等级设置,包括从0到6的不同级别及其功能,如阻止背景线程、事务回滚等,并提供了如何根据恢复等级进行数据备份、表删除及重启MySQL的方法。

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  • 设置恢复等级
innodb_force_recovery = 0
       1 (SRV_FORCE_IGNORE_CORRUPT)
       即使服务器检测到损坏的页仍让它运行。试图使SELECT* FROM tbl_name跳过损坏的索引记录和页,这样有助于转储表。
       2 (SRV_FORCE_NO_BACKGROUND)
       阻止主线程和任何清除线程的运行。如果崩溃会在清除操作中发生,该恢复值会阻止它。
       3 (SRV_FORCE_NO_TRX_UNDO)
       不要在崩溃恢复后运行事务回滚。
       4 (SRV_FORCE_NO_IBUF_MERGE)
       阻止插入缓冲合并操作。如果它们会导致崩溃,不要做这些。不计算表统计。这个值可以永久损坏数据文件。使用这个值后,准备号删除并重建所有辅助索引。在MySQL5.6.15中,设置InnoDB为只读。
       5 (SRV_FORCE_NO_UNDO_LOG_SCAN)
       在启动数据库时不查看撤消日志:InnoDB将即使未完成的事务也作为已提交。这个值可以永久损坏数据文件。在MySQL5.6.15中,设置InnoDB为只读。
       6 (SRV_FORCE_NO_LOG_REDO)
       不要通过恢复对重做日志进行前滚。这个值可能永久损坏数据文件。数据库页被留在一个陈旧的状态,这反过来又可能带给B-trees和其它数据库结构更多的损坏。在MySQL5.6.15中,设置InnoDB为只读。

你可以从表中SELECT来转储它们。innodb_force_recovery的值为3或更低,你可以DROP或CREATE表。在MySQL
5.6.27中,DROP TABLE还受大于3的innodb_force_recovery值支持。
  • 设置恢复等级后重启mysql
  • 备份数据
  • 删除对应的表数据,如果drop表失败,就去删除mysql的data目录中对应的数据库文件
  • 更改恢复等级设置,或者注释掉 重启mysql
处理一下出现的日志 Plugin 'FEDERATED' is disabled. 2017-11-15 19:23:46 16c0 InnoDB: Warning: Using innodb_additional_mem_pool_size is DEPRECATED. This option may be removed in future releases, together with the option innodb_use_sys_malloc and with the InnoDB's internal memory allocator. 2017-11-15 19:23:46 1404 [Note] InnoDB: Using atomics to ref count buffer pool pages 2017-11-15 19:23:46 1404 [Note] InnoDB: The InnoDB memory heap is disabled 2017-11-15 19:23:46 1404 [Note] InnoDB: Mutexes and rw_locks use Windows interlocked functions 2017-11-15 19:23:46 1404 [Note] InnoDB: Memory barrier is not used 2017-11-15 19:23:46 1404 [Note] InnoDB: Compressed tables use zlib 1.2.3 2017-11-15 19:23:46 1404 [Note] InnoDB: Not using CPU crc32 instructions 2017-11-15 19:23:46 1404 [Note] InnoDB: Initializing buffer pool, size = 9.0G 2017-11-15 19:23:46 1404 [Note] InnoDB: Completed initialization of buffer pool 2017-11-15 19:23:46 1404 [Note] InnoDB: Highest supported file format is Barracuda. 2017-11-15 19:23:46 1404 [Note] InnoDB: Log scan progressed past the checkpoint lsn 9219742510 2017-11-15 19:23:46 1404 [Note] InnoDB: Database was not shutdown normally! 2017-11-15 19:23:46 1404 [Note] InnoDB: Starting crash recovery. 2017-11-15 19:23:46 1404 [Note] InnoDB: Reading tablespace information from the .ibd files... 2017-11-15 19:23:46 1404 [Note] InnoDB: Restoring possible half-written data pages 2017-11-15 19:23:46 1404 [Note] InnoDB: from the doublewrite buffer... InnoDB: Doing recovery: scanned up to log sequence number 9219763629 InnoDB: 1 transaction(s) which must be rolled back or cleaned up InnoDB: in total 0 row operations to undo InnoDB: Trx id counter is 275040768 2017-11-15 19:23:47 1404 [Note] InnoDB: Starting an apply batch of log records to the database... InnoDB: Progress in percent: 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 InnoDB: Apply batch completed 2017-11-15 19:23:48 1404 [Note] InnoDB: 128 rollback segment(s) are active. InnoDB: Starting in background the rollback of uncommitted transactions 2017-11-15 19:23:48 fc8 InnoDB: Rolling back trx with id 275035944, 0 rows to undo 2017-11-15 19:23:48 fc8 InnoDB: Assertion failure in thread 4040 in file fut0lst.ic line 83 InnoDB: Failing assertion: addr.page == FIL_NULL || addr.boffset >= FIL_PAGE_DATA InnoDB: We intentionally generate a memory trap. InnoDB: Submit a detailed bug report to http://bugs.mysql.com. InnoDB: If you get repeated assertion failures or crashes, even InnoDB: immediately after the mysqld startup, there may be InnoDB: corruption in the InnoDB tablespace. Please refer to InnoDB: http://dev.mysql.com/doc/refman/5.6/en/forcing-innodb-recovery.html InnoDB: about forcing recovery. 2017-11-15 19:23:48 1404 [Note] InnoDB: Waiting for purge to start 2017-11-15 19:23:48 1404 [Note] InnoDB: 5.6.21 started; log sequence number 9219763629 2017-11-15 19:23:48 1404 [Note] Server hostname (bind-address): '*'; port: 3306 2017-11-15 19:23:48 1404 [Note] IPv6 is available. 2017-11-15 19:23:48 1404 [Note] - '::' resolves to '::'; 2017-11-15 19:23:48 1404 [Note] Server socket created on IP: '::'. 2017-11-15 19:23:48 1404 [Note] Event Scheduler: Loaded 0 events 2017-11-15 19:23:48 1404 [Note] D:\Documents\mysql\bin\mysqld.exe: ready for connections. Version: '5.6.21' socket: '' port: 3306 MySQL Community Server (GPL)
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