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MySQL5.6如何修改REDO日志的大小和个数

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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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