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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。
# 修改参数文件
# vi /etc/my_56.cnf
innodb_log_file_size = 2G
innodb_log_files_in_group = 5
# 重启数据库
# 启动的时候，查看错误日志，可以看到重新初始化了 REDO 日志
2018-05-28 09:40:54 25439 [Note] Plugin FEDERATED is disabled.
2018-05-28 09:40:54 25439 [Note] InnoDB: Using atomics to ref count buffer pool pages
2018-05-28 09:40:54 25439 [Note] InnoDB: The InnoDB memory heap is disabled
2018-05-28 09:40:54 25439 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins
2018-05-28 09:40:54 25439 [Note] InnoDB: Memory barrier is not used
2018-05-28 09:40:54 25439 [Note] InnoDB: Compressed tables use zlib 1.2.3
2018-05-28 09:40:54 25439 [Note] InnoDB: Using Linux native AIO
2018-05-28 09:40:54 25439 [Note] InnoDB: Using CPU crc32 instructions
2018-05-28 09:40:54 25439 [Note] InnoDB: Initializing buffer pool, size = 1.0G
2018-05-28 09:40:55 25439 [Note] InnoDB: Completed initialization of buffer pool
2018-05-28 09:40:55 25439 [Note] InnoDB: Highest supported file format is Barracuda.
2018-05-28 09:40:55 25439 [Warning] InnoDB: Resizing redo log from 2*3072 to 5*131072 pages, LSN=19620839567
2018-05-28 09:40:55 25439 [Warning] InnoDB: Starting to delete and rewrite log files.
2018-05-28 09:40:55 25439 [Note] InnoDB: Setting log file ./ib_logfile101 size to 2048 MB
InnoDB: Progress in MB: 100 200 300 400 500 600 700 800 900 1000 1100 1200 1300 1400 1500 1600 1700 1800 1900 2000
2018-05-28 09:41:06 25439 [Note] InnoDB: Setting log file ./ib_logfile1 size to 2048 MB
InnoDB: Progress in MB: 100 200 300 400 500 600 700 800 900 1000 1100 1200 1300 1400 1500 1600 1700 1800 1900 2000
2018-05-28 09:41:16 25439 [Note] InnoDB: Setting log file ./ib_logfile2 size to 2048 MB
InnoDB: Progress in MB: 100 200 300 400 500 600 700 800 900 1000 1100 1200 1300 1400 1500 1600 1700 1800 1900 2000
2018-05-28 09:41:26 25439 [Note] InnoDB: Setting log file ./ib_logfile3 size to 2048 MB
InnoDB: Progress in MB: 100 200 300 400 500 600 700 800 900 1000 1100 1200 1300 1400 1500 1600 1700 1800 1900 2000
2018-05-28 09:41:36 25439 [Note] InnoDB: Setting log file ./ib_logfile4 size to 2048 MB
InnoDB: Progress in MB: 100 200 300 400 500 600 700 800 900 1000 1100 1200 1300 1400 1500 1600 1700 1800 1900 2000
2018-05-28 09:41:46 25439 [Note] InnoDB: Renaming log file ./ib_logfile101 to ./ib_logfile0
2018-05-28 09:41:46 25439 [Warning] InnoDB: New log files created, LSN=19620839567
2018-05-28 09:41:46 25439 [Note] InnoDB: 128 rollback segment(s) are active.
2018-05-28 09:41:46 25439 [Note] InnoDB: Waiting for purge to start
2018-05-28 09:41:46 25439 [Note] InnoDB: 5.6.39 started; log sequence number 19620839567
2018-05-28 09:41:46 25439 [Note] Server hostname (bind-address): * port: 3306
2018-05-28 09:41:46 25439 [Note] IPv6 is available.
# 启动成功后，查看 REDO 日志的大小
mysql show global variables like %innodb_log_file_size%
+———————-+————+
| Variable_name | Value |
+———————-+————+
| innodb_log_file_size | 2147483648 |
+———————-+————+
1 row in set (0.01 sec)
mysql show global variables like %innodb_log_files_in_group%
+—————————+——-+
| Variable_name | Value |
+—————————+——-+
| innodb_log_files_in_group | 5 |
+—————————+——-+
1 row in set (0.01 sec)
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