Hi Marc,
You removed unneeded parts but I believe you removed one needed part.
Let's take the case of CHECK TABLE. Looking at [0] this statement can
return useful information (Msg_type, Msg_text).
When I try it without Ajax, I get such information so I believe that
with Ajax I should also see it.
[0] http://dev.mysql.com/doc/refman/5.5/en/check-table.html