Result dataset from SQL

Hi,  I have a problem with the result of an SQL statement and I'm not sure
why.  When trying to run an SQL, an SQL Script Error occur with the message
"Insufficient disk space"  (BDE Error 9475).

Is it a disk space? I got enough space...  Is it a RAM space?  Virtual
memory space?  Does the tables involve in the SQL have too many record for
being join together?