MySQL启动日志可以帮助用户查看MySQL服务器的启动信息，以便于更好地管理MySQL服务器。下面介绍MySQL查看启动日志的方法和命令操作步骤：
MySQL的启动日志文件位于MySQL配置文件中，我们可以使用以下命令查看MySQL的配置文件：
mysql -u root -p Enter password: Welcome to the MySQL monitor. Commands end with ; or \g. Your MySQL connection id is 6 Server version: 5.7.21-log Source distribution Copyright (c) 2000, 2018, Oracle and/or its affiliates. All rights reserved. Oracle is a registered trademark of Oracle Corporation and/or its affiliates. Other names may be trademarks of their respective owners. Type 'help;' or '\h' for help. Type '\c' to clear the current input statement. mysql> show variables like '%log_error%'; +----------------------+---------------------------------------------+ | Variable_name | Value | +----------------------+---------------------------------------------+ | log_error | /var/lib/mysql/mysql-error.log | | log_error_verbosity | 3 | | log_output | FILE | | log_queries_not_using_indexes | OFF | | log_slave_updates | OFF | +----------------------+---------------------------------------------+ 5 rows in set (0.00 sec)
从上面的输出中，可以看出MySQL的日志文件位于/var/lib/mysql/mysql-error.log，这就是MySQL的启动日志文件。
可以使用以下命令查看MySQL启动日志：
tail -f /var/lib/mysql/mysql-error.log
这样就可以查看MySQL启动日志的内容了，可以根据MySQL启动日志的内容更好地管理MySQL服务器。
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