How It Affects Your App
The MySQL 127 Key file for table %s being read-only will prevent any changes from being made to the table. This will have a direct impact on the application as it will not be able to access or modify the data stored in the table. This could lead to the application not functioning properly or not being able to perform certain tasks. Additionally, any queries that rely on the data stored in the table will not be able to be executed. This could lead to the application not being able to provide the expected results or not being able to perform certain tasks.
How To Fix
1. Check the MySQL server status:mysql> SHOW GLOBAL STATUS LIKE 'Aborted_connects';
+----------------------+-------+
| Variable_name | Value |
+----------------------+-------+
| Aborted_connects | 127 |
+----------------------+-------+
1 row in set (0.00 sec)
2. Check the MySQL error log:tail -f /var/log/mysql/error.log
2020-05-01T12:00:00.000Z [ERROR] [MY-012501] [InnoDB] Unable to lock ./ibdata1, error: 35
2020-05-01T12:00:00.000Z [Note] InnoDB: Check that you do not already have another mysqld process using the same InnoDB data or log files.
2020-05-01T12:00:00.000Z [ERROR] [MY-012501] [InnoDB] Unable to lock ./ibdata1, error: 35
2020-05-01T12:00:00.000Z [Note] InnoDB: Check that you do not already have another mysqld process using the same InnoDB data or log files.
2020-05-01T12:00:00.000Z [ERROR] [MY-012501] [InnoDB] Unable to lock ./ibdata1, error: 35
2020-05-01T12:00:00.000Z [Note] InnoDB: Check that you do not already have another mysqld process using the same InnoDB data or log files.
3. Check the MySQL process list:mysql> SHOW PROCESSLIST;
+----+------+-----------+------+---------+------+-------+------------------+
| Id | User | Host | db | Command | Time | State | Info |
+----+------+-----------+------+---------+------+-------+------------------+
| 1 | root | localhost | NULL | Query | 0 | NULL | SHOW PROCESSLIST |
+----+------+-----------+------+---------+------+-------+------------------+
1 row in set (0.00 sec)
4. Kill the extra MySQL process:mysql> KILL 1;
Query OK, 0 rows affected (0.00 sec)
5. Restart the MySQL server:sudo service mysql restart
6. Use an automated database observability tool to monitor and fix the MySQL 127 in question:An automated database observability tool can assist in monitoring and fixing the MySQL 127 in question by providing real-time visibility into the performance and health of the database. It can detect and alert on any issues that arise, such as slow queries, connection errors, and more. Additionally, it can provide detailed insights into the root cause of the issue, allowing for faster resolution times.
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