Error
Error Code:
77
MySQL Error 77: Failed to Set Option Value
Description
This error occurs when MySQL is unable to assign a specified value to a system variable or configuration option. It typically indicates an issue with the provided value, the variable's scope, or the user's permissions, preventing the intended configuration change from taking effect.
Error Message
%s: Error while setting value '%s' to '%s'.
Known Causes
4 known causesInvalid Value or Data Type
The value provided for the MySQL option does not match its expected data type or falls outside its permissible range.
Read-Only Variable
You attempted to modify a MySQL system variable that is designated as read-only and cannot be changed at runtime.
Insufficient User Privileges
The MySQL user attempting to set the option lacks the necessary administrative privileges to modify system variables.
Incorrect Variable Scope
The option was attempted to be set using the wrong scope (e.g., GLOBAL vs. SESSION), or it does not exist in the specified scope.
Solutions
3 solutions available1. Verify Configuration File Syntax and Permissions easy
Ensures the MySQL configuration file is syntactically correct and readable by the MySQL process.
1
Locate your MySQL configuration file. Common locations include `/etc/my.cnf`, `/etc/mysql/my.cnf`, or within `/etc/mysql/conf.d/` and `/etc/mysql/mysql.conf.d/`.
2
Open the configuration file in a text editor and meticulously check for syntax errors, such as misplaced quotes, missing equals signs, or incorrect section headers. Ensure each option is on its own line and properly formatted.
3
Verify that the MySQL user (often `mysql`) has read permissions for the configuration file and any included directories. If permissions are too restrictive, the MySQL server cannot read the settings.
sudo chown -R mysql:mysql /etc/mysql
sudo chmod -R 755 /etc/mysql4
If you made any changes, restart the MySQL service for them to take effect.
sudo systemctl restart mysql2. Check for Invalid or Unsupported Option Values medium
Identifies and corrects configuration options with values that are not recognized or supported by the current MySQL version.
1
Examine the specific option and value mentioned in the error message. Consult the MySQL documentation for your specific version to confirm the correct syntax and valid range of values for that option.
2
For example, if the error indicates an issue with `innodb_buffer_pool_size`, ensure the value is specified with appropriate units (e.g., `128M`, `2G`) and is within the system's memory limits. Incorrect values like `innodb_buffer_pool_size = 1024` without units can cause this error.
3
If you have recently upgraded MySQL, some older options might be deprecated or have different names. Cross-reference your configuration with the new version's documentation.
4
After correcting invalid values, restart the MySQL service.
sudo systemctl restart mysql3. Address Conflicting Configuration Settings medium
Resolves situations where different configuration files or sections provide conflicting settings for the same option.
1
MySQL loads configuration from multiple files, including the main `my.cnf` and files in `conf.d` and `mysql.conf.d` directories. The order of loading can lead to overrides.
2
Identify which option is causing the error and search all relevant configuration files for its presence. Look for duplicate definitions of the same option.
grep -r "option_name" /etc/mysql/3
If duplicates are found, decide which setting is the intended one. Typically, settings in later-loaded files (e.g., those in `conf.d`) will override earlier ones. Remove or comment out the conflicting setting in the file that should not take precedence.
4
Restart the MySQL service after resolving conflicts.
sudo systemctl restart mysql