This is the 3rd time i am having for different tables the same issue. I have a drupal project I am maintaining. Though the second time was months ago I could have paid more attention.. :-(. Anyway I find this cool blog post http://avinashsing.sunkur.com/2010/07/24/reasons-why-mysql-table-crashed-and-how-to-repair-it/ . Now I feel better 😀