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如何在 MySQL 中修改 innodb_data_file_path 参数事项？很多新手对此不是很清楚，为了帮助大家解决这个难题，下面丸趣 TV 小编将为大家详细讲解，有这方面需求的人可以来学习下，希望你能有所收获。
在测试环境下没有设置过多的详细参数就初始化并启动了服务，后期优化的过程中发现 innodb_data_file_path 设置过小：
root@node1 14:59: [(none)] show variables like %innodb_data_file_path%
+-----------------------+------------------------+
| Variable_name | Value |
+-----------------------+------------------------+
| innodb_data_file_path | ibdata1:12M:autoextend |
+-----------------------+------------------------+
1 row in set (0.00 sec)
root@node1 14:59: [(none)]当没有配置 innodb_data_file_path 时，默认 innodb_data_file_path = ibdata1:12M:autoextend
[mysqld]
innodb_data_file_path = ibdata1:12M:autoextend当需要改为 1G 时，不能直接在配置文件把 ibdata1 改为 1G ,
[mysqld]
innodb_data_file_path = ibdata1:1G:autoextend否则启动服务之后，从错误日志看到如下报错：
2019-03-29T06:47:32.044316Z 0 [ERROR] InnoDB: The Auto-extending innodb_system data file ./ibdata1 is of a different size 768 pages (rounded down to MB) than specified in the .cnf file: initial 65536 pages, max 0 (relevant if non-zero) pages!
大致意思就是 ibdata1 的大小不是 65536page*16KB/1024KB=1G , 而是 786page*16KB/1024KB=12M
（未使用压缩页）
方法一：推荐
而应该再添加一个 ibdata2:1G，如下：
[mysqld]
innodb_data_file_path = ibdata1:12M;ibdata2:1G:autoextend重启数据库！
方法二：不推荐
直接改为如下的话
[mysqld]
innodb_data_file_path = ibdata1:1G:autoextend可以删除 $mysql_datadir 目录下 ibdata1、ib_logfile0、ib_logfile1 文件：
rm -f ibdata* ib_logfile*也可以启动 MySQL，但是 mysql 错误日志里会报如下错误：
2019-03-29T07:10:47.844560Z 0 [Warning] Could not increase number of max_open_files to more than 5000 (request: 65535)
2019-03-29T07:10:47.844686Z 0 [Warning] Changed limits: table_open_cache: 1983 (requested 2000)
2019-03-29T07:10:48.028262Z 0 [Warning] NO_AUTO_CREATE_USER sql mode was not set.
2019-03-29T07:10:48.147653Z 0 [Warning] InnoDB: Cannot open table mysql/plugin from the internal data dictionary of InnoDB though the .frm file for the table exists. Please refer to http://dev.mysql.com/doc/refman/5.7/en/innodb-troubleshooting.html for how to resolve the issue.
mysqld: Table mysql.plugin doesn t exist
2019-03-29T07:10:48.147775Z 0 [ERROR] Can t open the mysql.plugin table. Please run mysql_upgrade to create it.
2019-03-29T07:10:48.163444Z 0 [Warning] InnoDB: Cannot open table mysql/gtid_executed from the internal data dictionary of InnoDB though the .frm file for the table exists. Please refer to http://dev.mysql.com/doc/refman/5.7/en/innodb-troubleshooting.html for how to resolve the issue.
mysqld: Table mysql.gtid_executed doesn t exist
2019-03-29T07:10:48.163502Z 0 [Warning] Gtid table is not ready to be used. Table mysql.gtid_executed cannot be opened.
2019-03-29T07:10:48.163658Z 0 [Warning] InnoDB: Cannot open table mysql/gtid_executed from the internal data dictionary of InnoDB though the .frm file for the table exists. Please refer to http://dev.mysql.com/doc/refman/5.7/en/innodb-troubleshooting.html for how to resolve the issue.
mysqld: Table mysql.gtid_executed doesn t exist
2019-03-29T07:10:48.163711Z 0 [Warning] Gtid table is not ready to be used. Table mysql.gtid_executed cannot be opened.
2019-03-29T07:10:48.164619Z 0 [Warning] Failed to set up SSL because of the following SSL library error: SSL context is not usable without certificate and private key
2019-03-29T07:10:48.166805Z 0 [Warning] InnoDB: Cannot open table mysql/server_cost from the internal data dictionary of InnoDB though the .frm file for the table exists. Please refer to http://dev.mysql.com/doc/refman/5.7/en/innodb-troubleshooting.html for how to resolve the issue.
2019-03-29T07:10:48.166891Z 0 [Warning] Failed to open optimizer cost constant tables
2019-03-29T07:10:48.168072Z 0 [Warning] InnoDB: Cannot open table mysql/time_zone_leap_second from the internal data dictionary of InnoDB though the .frm file for the table exists. Please refer to http://dev.mysql.com/doc/refman/5.7/en/innodb-troubleshooting.html for how to resolve the issue.
2019-03-29T07:10:48.168165Z 0 [Warning] Can t open and lock time zone table: Table mysql.time_zone_leap_second doesn t exist trying to live without them
2019-03-29T07:10:48.169454Z 0 [Warning] InnoDB: Cannot open table mysql/servers from the internal data dictionary of InnoDB though the .frm file for the table exists. Please refer to http://dev.mysql.com/doc/refman/5.7/en/innodb-troubleshooting.html for how to resolve the issue.
2019-03-29T07:10:48.169527Z 0 [ERROR] Can t open and lock privilege tables: Table mysql.servers doesn t exist
2019-03-29T07:10:48.170042Z 0 [Warning] InnoDB: Cannot open table mysql/slave_master_info from the internal data dictionary of InnoDB though the .frm file for the table exists. Please refer to http://dev.mysql.com/doc/refman/5.7/en/innodb-troubleshooting.html for how to resolve the issue.
2019-03-29T07:10:48.170617Z 0 [Warning] InnoDB: Cannot open table mysql/slave_relay_log_info from the internal data dictionary of InnoDB though the .frm file for the table exists. Please refer to http://dev.mysql.com/doc/refman/5.7/en/innodb-troubleshooting.html for how to resolve the issue.
2019-03-29T07:10:48.170946Z 0 [Warning] InnoDB: Cannot open table mysql/slave_master_info from the internal data dictionary of InnoDB though the .frm file for the table exists. Please refer to http://dev.mysql.com/doc/refman/5.7/en/innodb-troubleshooting.html for how to resolve the issue.
2019-03-29T07:10:48.171046Z 0 [Warning] Info table is not ready to be used. Table mysql.slave_master_info cannot be opened.
2019-03-29T07:10:48.171272Z 0 [Warning] InnoDB: Cannot open table mysql/slave_worker_info from the internal data dictionary of InnoDB though the .frm file for the table exists. Please refer to http://dev.mysql.com/doc/refman/5.7/en/innodb-troubleshooting.html for how to resolve the issue.
2019-03-29T07:10:48.171626Z 0 [Warning] InnoDB: Cannot open table mysql/slave_relay_log_info from the internal data dictionary of InnoDB though the .frm file for the table exists. Please refer to http://dev.mysql.com/doc/refman/5.7/en/innodb-troubleshooting.html for how to resolve the issue.
2019-03-29T07:10:48.171688Z 0 [Warning] Info table is not ready to be used. Table mysql.slave_relay_log_info cannot be opened.看完上述内容是否对您有帮助呢？如果还想对相关知识有进一步的了解或阅读更多相关文章，请关注丸趣 TV 行业资讯频道，感谢您对丸趣 TV 的支持。
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