這篇文章給大家介紹MySQL表索引損壞致Crash及修復(fù)過程是怎樣的，內(nèi)容非常詳細，感興趣的小伙伴們可以參考借鑒，希望對大家能有所幫助。

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監(jiān)控到一臺MySQL實例在早上發(fā)生過Crash，上去看了一下，已經(jīng)被mysqld_safe成功拉起。
上去檢查一下錯誤日志，發(fā)現(xiàn)錯誤日志如下（已對表名，庫名，路徑做脫敏處理）：

1. ……………………………………（大量相同的報錯）…………………………………………

2. 2017-08-31T11:11:04.291424Z 32394522 [ERROR] InnoDB: Record in index `t_idx` of table `$db_name`.`$tb_name` was not found on update: TUPLE (info_bits=0, 9 fields): {[12]121098369601(0x010201000908030609060001),[9] (0x000000000000010000),[4]KOWA(0x0B0F0701),[4]AYNA(0x01090E01),[6]STAT44(0x030401040404),[4]AYNA(0x01090E01),[1]0(0x00),[1]0(0x00),[32]8f2a39b44fe74cd781527d856342d834(0x0806020103090204040605070403040708010502070408050603040204080304)} at: COMPACT RECORD(info_bits=0, 9 fields): {[12]121098369601(0x010201000908030609060001),[9] (0x000000000000010000),[4]KOWA(0x0B0F0701),[4]AYNA(0x01090E01),NULL,NULL,[1]0(0x00),[1]0(0x00),[32]8f2a39b44fe74cd781527d856342d834(0x0806020103090204040605070403040708010502070408050603040204080304)}

3. 2017-08-31T03:11:04.291454Z 32394522 [Note] InnoDB: GIS MBR INFO: 1.31506e-47 and 1.02964e-71, 2.8816e-306, 1.93059e+53

5. 2017-08-31 03:11:04 0x7fcaf04be700  InnoDB: Assertion failure in thread 140509591627520 in file row0ins.cc line 282

6. InnoDB: Failing assertion: !cursor->index->is_committed()

7. InnoDB: We intentionally generate a memory trap.

8. InnoDB: Submit a detailed bug report to http://bugs.mysql.com.

9. InnoDB: If you get repeated assertion failures or crashes, even

10. InnoDB: immediately after the mysqld startup, there may be

11. InnoDB: corruption in the InnoDB tablespace. Please refer to

12. InnoDB: http://dev.mysql.com/doc/refman/5.7/en/forcing-innodb-recovery.html

13. InnoDB: about forcing recovery.

14. 03:11:04 UTC - mysqld got signal 6 ;

15. This could be because you hit a bug. It is also possible that this binary

16. or one of the libraries it was linked against is corrupt, improperly built,

17. or misconfigured. This error can also be caused by malfunctioning hardware.

18. Attempting to collect some information that could help diagnose the problem.

19. As this is a crash and something is definitely wrong, the information

20. collection process might fail.

22. …………………………………………………………………………………………………………

24. Trying to get some variables.

25. Some pointers may be invalid and cause the dump to abort.

26. Query (7fca7c0dbaa0): is an invalid pointer

27. Connection ID (thread ID): 32394522

28. Status: NOT_KILLED

30. The manual page at http://dev.mysql.com/doc/mysql/en/crashing.html contains

31. information that should help you find out what is causing the crash.

32. …………………………………………………………………………………………………………

33. （重啟中）

34. …………………………………………………………………………………………………………

35. 2017-08-31T03:11:08.925622Z 0 [Note] $basedir/bin/mysqld: ready for connections.

36. Version: '5.7.12-log' socket: '$datadir/mysqld.sock' port: 3306  Source distribution

38. 2017-08-31T03:31:10.232145Z 1704 [ERROR] InnoDB: Record in index `t_idx` of table `$db_name`.`$tb_name` was not found on update: TUPLE (info_bits=0, 9 fields): {[12]198051077411(0x010908000501000707040101),[9] 7 (0x000000000000020700),[4]AOGA(0x010F0701),[4]AQGA(0x01010701),[6]STAT44(0x030401040404),NULL,[1]0(0x00),[1]0(0x00),[32]c6f98a358ace4897a11a27d689bb6884(0x0306060908010305080103050408090701010101020704060809020206080804)} at: COMPACT RECORD(info_bits=0, 9 fields): {[12]198051077411(0x010908000501000707040101),[9] 7 (0x000000000000020700),[4]AOGA(0x010F0701),[4]AQGA(0x01010701),NULL,NULL,[1]0(0x00),[1]0(0x00),[32]c6f98a358ace4897a11a27d689bb6884(0x0306060908010305080103050408090701010101020704060809020206080804)}

39. 2017-08-31T03:31:10.232168Z 1704 [Note] InnoDB: GIS MBR INFO: 7.26084e-43 and 1.08604e-42, 2.8823e-306, 132832

41. 2017-08-31T03:35:51.201716Z 2208 [ERROR] InnoDB: Flagged corruption of `t_idx` in table `$db_name`.`$tb_name` in CHECK TABLE; Wrong count

初步確定為因為名為t_idx的索引損壞導(dǎo)致的大量報錯，并在處理update語句時導(dǎo)致crash。
檢查binlog發(fā)現(xiàn)的確有很多對該表的update操作。
執(zhí)行一下check table，發(fā)現(xiàn)的確有問題：

1. mysql> CHECK TABLE `$db_name`.`$tb_name`;

2. +--------------------+-------+----------+-------------------------------------------------------+

3. | Table              | Op    | Msg_type | Msg_text                                               |

4. +--------------------+-------+----------+-------------------------------------------------------+

5. | $db_name.$tb_name  | check | Warning  | InnoDB: Index t_idx is marked as corrupted            |

6. | $db_name.$tb_name  | check | error    | Corrupt                                               |

7. +--------------------+-------+----------+-------------------------------------------------------+

8. 2 rows in set (0.83 sec)

因該庫為高可用主庫，檢查到備庫狀態(tài)正常，準備先手動做failover，再對該表進行修復(fù)。

因為表小，也比較幸運，修復(fù)過程十分順利：

1. mysql> OPTIMIZE TABLE `$db_name`.`$tb_name`;

2. +--------------------+----------+----------+-------------------------------------------------------------------+

3. | Table              | Op       | Msg_type | Msg_text                                                          |

4. +--------------------+----------+----------+-------------------------------------------------------------------+

5. | $db_name.$tb_name  | optimize | note     | Table does not support optimize, doing recreate + analyze instead |

6. | $db_name.$tb_name  | optimize | status   | OK                                                                |

7. +--------------------+----------+----------+-------------------------------------------------------------------+

8. 2 rows in set (3.42 sec)

10. mysql> ALTER TABLE `$db_name`.`$tb_name` ENGINE=INNODB;

11. Query OK, 0 rows affected (3.09 sec)

12. Records: 0  Duplicates: 0  Warnings: 0

14. mysql> ANALYZE TABLE `$db_name`.`$tb_name`;

15. +--------------------+---------+----------+----------+

16. | Table              | Op      | Msg_type | Msg_text |

17. +--------------------+---------+----------+----------+

18. | $db_name.$tb_name  | analyze | status   | OK       |

19. +--------------------+---------+----------+----------+

20. 1 row in set (0.00 sec)

22. mysql> CHECK TABLE `$db_name`.`$tb_name`;

23. +--------------------+-------+----------+----------+

24. | Table              | Op    | Msg_type | Msg_text |

25. +--------------------+-------+----------+----------+

26. | $db_name.$tb_name  | check | status   | OK       |

27. +--------------------+-------+----------+----------+

28. 1 row in set (0.98 sec)

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