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The main reasons why you cannot log in to MySQL as root are permission problems, configuration file errors, password inconsistent, socket file problems, or firewall interception. The solution includes: check whether the bind-address parameter in the configuration file is configured correctly. Check whether the root user permissions have been modified or deleted and reset. Verify that the password is accurate, including case and special characters. Check socket file permission settings and paths. Check that the firewall blocks connections to the MySQL server.

The following steps can be used to resolve the problem that Navicat cannot connect to the database: Check the server connection, make sure the server is running, address and port correctly, and the firewall allows connections. Verify the login information and confirm that the user name, password and permissions are correct. Check network connections and troubleshoot network problems such as router or firewall failures. Disable SSL connections, which may not be supported by some servers. Check the database version to make sure the Navicat version is compatible with the target database. Adjust the connection timeout, and for remote or slower connections, increase the connection timeout timeout. Other workarounds, if the above steps are not working, you can try restarting the software, using a different connection driver, or consulting the database administrator or official Navicat support.

There are many reasons why MySQL startup fails, and it can be diagnosed by checking the error log. Common causes include port conflicts (check port occupancy and modify configuration), permission issues (check service running user permissions), configuration file errors (check parameter settings), data directory corruption (restore data or rebuild table space), InnoDB table space issues (check ibdata1 files), plug-in loading failure (check error log). When solving problems, you should analyze them based on the error log, find the root cause of the problem, and develop the habit of backing up data regularly to prevent and solve problems.

The MySQL connection may be due to the following reasons: MySQL service is not started, the firewall intercepts the connection, the port number is incorrect, the user name or password is incorrect, the listening address in my.cnf is improperly configured, etc. The troubleshooting steps include: 1. Check whether the MySQL service is running; 2. Adjust the firewall settings to allow MySQL to listen to port 3306; 3. Confirm that the port number is consistent with the actual port number; 4. Check whether the user name and password are correct; 5. Make sure the bind-address settings in my.cnf are correct.

MySQL does not support array types in essence, but can save the country through the following methods: JSON array (constrained performance efficiency); multiple fields (poor scalability); and association tables (most flexible and conform to the design idea of ​​relational databases).

It is impossible to view PostgreSQL passwords directly from Navicat, because Navicat stores passwords encrypted for security reasons. To confirm the password, try to connect to the database; to modify the password, please use the graphical interface of psql or Navicat; for other purposes, you need to configure connection parameters in the code to avoid hard-coded passwords. To enhance security, it is recommended to use strong passwords, periodic modifications and enable multi-factor authentication.