Database error persistant since 3 years! Please help

[ehabfouad22]

The error appears when I try to load the forum home page, and in other instances the homepage loads correctly, but the threads and subforums is showing the same error.
The text of the only error I get is exactly as follows:

"Database error
The database has encountered a problem.

--------------------------------------------------------------------------------

Please try the following:
Load the page again by clicking the Refresh button in your web browser.
Open the www.mysite.org home page, then try to open another page.
Click the Back button to try another link.

The www.mysite.org forum technical staff have been notified of the error, though you may contact them if the problem persists.

We apologise for any inconvenience."

And I apologize also for any inconvenience But I'm really fed up with that frequent error that may last for hours.
Thanks for your time, guys, and as I said I hope I can find an actual professional reliable solution to make my database tables work more effeciently.