MySQL tables/databases can become currupted for any number of reasons; server crashes, insufficient space, etc; it all honestly varies case by case.
For most cases you can repair the database with built in command tools, such as the "
myisamchk" tool I linked to in my previous post.
In a lot of cases, a simple "repair" via the MySQL command can fix a lot of issues; however, running this or any SQL maintenance from a web browser is highly not advised by me, it will take forever, doing such tasks from the command line will highly improve wait times here as you'll not be bogging down (or be bogged down by) the webserver to execute MySQL commands and recieve feedback.
