When working with MySQL 5.1 on Red Hat Enterprise Linux, you might encounter permission limitations even after using cPanel's user management tools. The issue typically stems from incomplete privilege grants, which tools like Jet Profiler can detect.

Before proceeding, ensure you have:

• SSH access to your server
• MySQL root or admin credentials
• Basic familiarity with Linux command line

Connect to your server via SSH and access MySQL:

mysql -u root -p
Enter password: ******

To grant full privileges to a specific user for all databases:

GRANT ALL PRIVILEGES ON *.* TO 'username'@'localhost' IDENTIFIED BY 'password';
FLUSH PRIVILEGES;

Check the granted permissions with:

SHOW GRANTS FOR 'username'@'localhost';

If you're still facing permission issues:

1. Ensure the user exists in both MySQL and cPanel
2. Check for conflicting permissions at different levels (*.* vs specific databases)
3. Verify the host parameter matches your connection method (localhost vs %)

For remote connections, use:

GRANT ALL PRIVILEGES ON *.* TO 'username'@'%' IDENTIFIED BY 'password';
FLUSH PRIVILEGES;

While granting full privileges is sometimes necessary for development:

• Consider more restrictive permissions for production
• Regularly audit user privileges
• Use strong passwords and limit host access

When working with MySQL 5.1 on RedHat systems, you might encounter permission issues where administrative tools like Jet Profiler indicate insufficient privileges. The GRANT statement in MySQL is what you need to properly configure user permissions.

Here's the complete command to grant all privileges to a user:

GRANT ALL PRIVILEGES ON *.* TO 'username'@'localhost' 
IDENTIFIED BY 'password' WITH GRANT OPTION;
FLUSH PRIVILEGES;

Let's examine each part of this powerful statement:

• ALL PRIVILEGES: Grants all available permissions
• *.*: Applies to all databases and tables
• WITH GRANT OPTION: Allows the user to grant privileges to others

If you want to limit privileges to a specific database:

GRANT ALL PRIVILEGES ON database_name.* TO 'username'@'localhost' 
IDENTIFIED BY 'password';

After executing these commands, verify the changes with:

SHOW GRANTS FOR 'username'@'localhost';

If you're still facing permission issues after running these commands:

1. Ensure you're logged in as root or another privileged user
2. Check if the MySQL service was restarted after privilege changes
3. Confirm there are no conflicting user entries in the mysql.user table

For complete system-level access (similar to root):

GRANT ALL PRIVILEGES ON *.* TO 'superuser'@'%' 
IDENTIFIED BY 'strongpassword' WITH GRANT OPTION;