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一套线上环境的REDO日志的大小和格式设置的不合理，需要将日志大小修改成2G，个数改为5个。

1. # 修改参数文件

2. # vi /etc/my_56.cnf

3. innodb_log_file_size = 2G

4. innodb_log_files_in_group = 5

6. # 重启数据库

8. # 启动的时候，查看错误日志，可以看到重新初始化了REDO日志

9. 2018-05-28 09:40:54 25439 [Note] Plugin 'FEDERATED' is disabled.

10. 2018-05-28 09:40:54 25439 [Note] InnoDB: Using atomics to ref count buffer pool pages

11. 2018-05-28 09:40:54 25439 [Note] InnoDB: The InnoDB memory heap is disabled

12. 2018-05-28 09:40:54 25439 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins

13. 2018-05-28 09:40:54 25439 [Note] InnoDB: Memory barrier is not used

14. 2018-05-28 09:40:54 25439 [Note] InnoDB: Compressed tables use zlib 1.2.3

15. 2018-05-28 09:40:54 25439 [Note] InnoDB: Using Linux native AIO

16. 2018-05-28 09:40:54 25439 [Note] InnoDB: Using CPU crc32 instructions

17. 2018-05-28 09:40:54 25439 [Note] InnoDB: Initializing buffer pool, size = 1.0G

18. 2018-05-28 09:40:55 25439 [Note] InnoDB: Completed initialization of buffer pool

19. 2018-05-28 09:40:55 25439 [Note] InnoDB: Highest supported file format is Barracuda.

20. 2018-05-28 09:40:55 25439 [Warning] InnoDB: Resizing redo log from 2*3072 to 5*131072 pages, LSN=19620839567

21. 2018-05-28 09:40:55 25439 [Warning] InnoDB: Starting to delete and rewrite log files.

22. 2018-05-28 09:40:55 25439 [Note] InnoDB: Setting log file ./ib_logfile101 size to 2048 MB

23. InnoDB: Progress in MB: 100 200 300 400 500 600 700 800 900 1000 1100 1200 1300 1400 1500 1600 1700 1800 1900 2000

24. 2018-05-28 09:41:06 25439 [Note] InnoDB: Setting log file ./ib_logfile1 size to 2048 MB

25. InnoDB: Progress in MB: 100 200 300 400 500 600 700 800 900 1000 1100 1200 1300 1400 1500 1600 1700 1800 1900 2000

26. 2018-05-28 09:41:16 25439 [Note] InnoDB: Setting log file ./ib_logfile2 size to 2048 MB

27. InnoDB: Progress in MB: 100 200 300 400 500 600 700 800 900 1000 1100 1200 1300 1400 1500 1600 1700 1800 1900 2000

28. 2018-05-28 09:41:26 25439 [Note] InnoDB: Setting log file ./ib_logfile3 size to 2048 MB

29. InnoDB: Progress in MB: 100 200 300 400 500 600 700 800 900 1000 1100 1200 1300 1400 1500 1600 1700 1800 1900 2000

30. 2018-05-28 09:41:36 25439 [Note] InnoDB: Setting log file ./ib_logfile4 size to 2048 MB

31. InnoDB: Progress in MB: 100 200 300 400 500 600 700 800 900 1000 1100 1200 1300 1400 1500 1600 1700 1800 1900 2000

32. 2018-05-28 09:41:46 25439 [Note] InnoDB: Renaming log file ./ib_logfile101 to ./ib_logfile0

33. 2018-05-28 09:41:46 25439 [Warning] InnoDB: New log files created, LSN=19620839567

34. 2018-05-28 09:41:46 25439 [Note] InnoDB: 128 rollback segment(s) are active.

35. 2018-05-28 09:41:46 25439 [Note] InnoDB: Waiting for purge to start

36. 2018-05-28 09:41:46 25439 [Note] InnoDB: 5.6.39 started; log sequence number 19620839567

37. 2018-05-28 09:41:46 25439 [Note] Server hostname (bind-address): '*'; port: 3306

38. 2018-05-28 09:41:46 25439 [Note] IPv6 is available.

40. # 启动成功后，查看REDO日志的大小

41. mysql> show global variables like '%innodb_log_file_size%';

42. +----------------------+------------+

43. | Variable_name | Value |

44. +----------------------+------------+

45. | innodb_log_file_size | 2147483648 |

46. +----------------------+------------+

47. 1 row in set (0.01 sec)

49. mysql> show global variables like '%innodb_log_files_in_group%';

50. +---------------------------+-------+

51. | Variable_name | Value |

52. +---------------------------+-------+

53. | innodb_log_files_in_group | 5 |

54. +---------------------------+-------+

55. 1 row in set (0.01 sec)

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