問題介紹
電腦在使用過程中死機，重啟后發現mysql沒有啟動成功，查看錯誤日志發現是innodb出現問題導致mysql啟動失敗。
錯誤日志
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$ mysql.server startStarting MySQL. ERROR! The server quit without updating PID file (/usr/local/var/mysql/fdipzonedeMacBook-Air.local.pid).22:08:37 mysqld_safe Starting mysqld daemon with databases from /usr/local/var/mysql2016-04-23 22:08:38 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).2016-04-23 22:08:38 0 [Note] /usr/local/Cellar/mysql/5.6.24/bin/mysqld (mysqld 5.6.24) starting as process 3604 ...2016-04-23 22:08:38 3604 [Warning] Setting lower_case_table_names=2 because file system for /usr/local/var/mysql/ is case insensitive2016-04-23 22:08:38 3604 [Note] Plugin 'FEDERATED' is disabled.2016-04-23 22:08:38 3604 [Note] InnoDB: Using atomics to ref count buffer pool pages2016-04-23 22:08:38 3604 [Note] InnoDB: The InnoDB memory heap is disabled2016-04-23 22:08:38 3604 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins2016-04-23 22:08:38 3604 [Note] InnoDB: Memory barrier is not used2016-04-23 22:08:38 3604 [Note] InnoDB: Compressed tables use zlib 1.2.32016-04-23 22:08:38 3604 [Note] InnoDB: Using CPU crc32 instructions2016-04-23 22:08:38 3604 [Note] InnoDB: Initializing buffer pool, size = 128.0M2016-04-23 22:08:38 3604 [Note] InnoDB: Completed initialization of buffer pool2016-04-23 22:08:38 3604 [Note] InnoDB: Highest supported file format is Barracuda.2016-04-23 22:08:38 3604 [Note] InnoDB: Log scan progressed past the checkpoint lsn 689299334402016-04-23 22:08:38 3604 [Note] InnoDB: Database was not shutdown normally!2016-04-23 22:08:38 3604 [Note] InnoDB: Starting crash recovery.2016-04-23 22:08:38 3604 [Note] InnoDB: Reading tablespace information from the .ibd files...2016-04-23 22:08:38 3604 [ERROR] InnoDB: checksum mismatch in tablespace ./test_user/user_recommend_code#P#pmax.ibd (table test_user/user_recommend_code#P#pmax)2016-04-23 22:08:38 3604 [Note] InnoDB: Page size:1024 Pages to analyze:642016-04-23 22:08:38 3604 [Note] InnoDB: Page size: 1024, Possible space_id count:02016-04-23 22:08:38 3604 [Note] InnoDB: Page size:2048 Pages to analyze:482016-04-23 22:08:38 3604 [Note] InnoDB: Page size: 2048, Possible space_id count:02016-04-23 22:08:38 3604 [Note] InnoDB: Page size:4096 Pages to analyze:242016-04-23 22:08:38 3604 [Note] InnoDB: Page size: 4096, Possible space_id count:02016-04-23 22:08:38 3604 [Note] InnoDB: Page size:8192 Pages to analyze:122016-04-23 22:08:38 3604 [Note] InnoDB: Page size: 8192, Possible space_id count:02016-04-23 22:08:38 3604 [Note] InnoDB: Page size:16384 Pages to analyze:62016-04-23 22:08:38 3604 [Note] InnoDB: VALID: space:2947354 page_no:3 page_size:163842016-04-23 22:08:38 3604 [Note] InnoDB: Page size: 16384, Possible space_id count:12016-04-23 22:08:38 3604 [Note] InnoDB: space_id:2947354, Number of pages matched: 1/1 (16384)2016-04-23 22:08:38 3604 [Note] InnoDB: Chosen space:29473542016-04-23 22:08:38 3604 [Note] InnoDB: Restoring page 0 of tablespace 29473542016-04-23 22:08:38 3604 [Warning] InnoDB: Doublewrite does not have page_no=0 of space: 29473542016-04-23 22:08:38 7fff79b9e300 InnoDB: Operating system error number 2 in a file operation.InnoDB: The error means the system cannot find the path specified.InnoDB: If you are installing InnoDB, remember that you must createInnoDB: directories yourself, InnoDB does not create them.InnoDB: Error: could not open single-table tablespace file ./test_user/user_recommend_code#P#pmax.ibdInnoDB: We do not continue the crash recovery, because the table may becomeInnoDB: corrupt if we cannot apply the log records in the InnoDB log to it.InnoDB: To fix the problem and start mysqld:InnoDB: 1) If there is a permission problem in the file and mysqld cannotInnoDB: open the file, you should modify the permissions.InnoDB: 2) If the table is not needed, or you can restore it from a backup,InnoDB: then you can remove the .ibd file, and InnoDB will do a normalInnoDB: crash recovery and ignore that table.InnoDB: 3) If the file system or the disk is broken, and you cannot removeInnoDB: the .ibd file, you can set innodb_force_recovery > 0 in my.cnfInnoDB: and force InnoDB to continue crash recovery here. |
解決方法
1.如果數據不重要或已經有備份，只需要恢復mysql啟動
進入mysql目錄，一般是： /usr/local/var/mysql/
刪除ib_logfile*
刪除ibdata*
刪除所有數據庫物理目錄（例如數據庫為test_db,則執行rm -rf test_db）
重啟動mysql
重新建立數據庫或使用備份覆蓋
2.如果數據很重要且沒有備份
可以使用innodb_force_recovery參數，使mysqld跳過恢復步驟，啟動mysqld，將數據導出然后重建數據庫。
innodb_force_recovery 可以設置為1-6，大的數字包含前面所有數字的影響
1、(SRV_FORCE_IGNORE_CORRUPT):忽略檢查到的corrupt頁。
2、(SRV_FORCE_NO_BACKGROUND):阻止主線程的運行，如主線程需要執行full purge操作，會導致crash。
3、(SRV_FORCE_NO_TRX_UNDO):不執行事務回滾操作。
4、(SRV_FORCE_NO_IBUF_MERGE):不執行插入緩沖的合并操作。
5、(SRV_FORCE_NO_UNDO_LOG_SCAN):不查看重做日志，InnoDB存儲引擎會將未提交的事務視為已提交。
6、(SRV_FORCE_NO_LOG_REDO):不執行前滾的操作。
在my.cnf(windows是my.ini)中加入
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innodb_force_recovery = 6 innodb_purge_thread = 0 |
重啟mysql
這時只可以執行select,create,drop操作，但不能執行insert,update,delete操作
執行邏輯導出，完成后將innodb_force_recovery=0，innodb_purge_threads=1，然后重建數據庫，最后把導出的數據重新導入
總結
以上就是這篇文章的全部內容，希望能對大家學習或者使用mysql的時候有所幫助，如果有疑問大家可以留言交流，謝謝大家對服務器之家的支持。
