another problem but don't know how to search

Using Drupal4.6.
When I found that I create a forum topic but it didn't display in the forum, I check MySQL database, I got this warning:

===========================================
Problems with indexes of table `node`
Warning More than one INDEX key was created for column `status`
Problems with indexes of table `term_node`
Warning PRIMARY and INDEX keys should not both be set for column `tid`
============================================

I want to search for the answer, but don't know the keyword i need.