How It Affects Your App
MySQL 1651 ER_QUERY_CACHE_DISABLED indicates that the query cache is disabled. This can have a significant impact on the performance of an application, as the query cache is used to store the results of queries so that they can be quickly retrieved without having to re-execute the query. Without the query cache, the application will have to re-execute queries each time they are requested, resulting in slower performance. Additionally, the application may experience increased load on the database server due to the increased number of queries being executed.
How To Fix
1. Check the error log for the MySQL 1651 error:
$ tail -f /var/log/mysql/error.log
2. Check the MySQL configuration file for any misconfigurations:
$ cat /etc/mysql/my.cnf
3. Check the MySQL process list for any suspicious activity:
$ mysqladmin -u root -p processlist
4. Check the MySQL user table for any suspicious users:
$ mysql -u root -p -e "SELECT User, Host FROM mysql.user;"
5. Check the MySQL grant tables for any suspicious grants:
$ mysql -u root -p -e "SELECT * FROM mysql.db;"
6. Check the MySQL system variables for any misconfigurations:
$ mysql -u root -p -e "SHOW VARIABLES;"
7. Check the MySQL system status for any misconfigurations:
$ mysql -u root -p -e "SHOW STATUS;"
8. Check the MySQL system logs for any suspicious activity:
$ mysql -u root -p -e "SHOW LOGS;"
9. Check the MySQL system tables for any suspicious activity:
$ mysql -u root -p -e "SHOW TABLES;"
10. Check the MySQL system processes for any suspicious activity:
$ mysql -u root -p -e "SHOW PROCESSLIST;"
11. Check the MySQL system variables for any misconfigurations:
$ mysql -u root -p -e "SHOW VARIABLES;"
12. Check the MySQL system status for any misconfigurations:
$ mysql -u root -p -e "SHOW STATUS;"
13. Check the MySQL system logs for any suspicious activity:
$ mysql -u root -p -e "SHOW LOGS;"
14. Check the MySQL system tables for any suspicious activity:
$ mysql -u root -p -e "SHOW TABLES;"
15. Check the MySQL system processes for any suspicious activity:
$ mysql -u root -p -e "SHOW PROCESSLIST;"
16. Use an automated database observability tool to monitor and fix the MySQL 1651 in question. Automated database observability tools can provide real-time insights into the performance and health of your database, allowing you to quickly identify and fix any issues that may arise.
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