Question

How can I make a sql SELECT query run forever in oracle 10g? It should go to completion and should be running forever until stopped by killing the session.

Answer 1

SELECT dummy
  FROM dual
CONNECT BY level > 0

If you want it to “fork” a bit more:

WITH x AS ( SELECT column_value y FROM TABLE(sys.dbms_debug_vc2coll('a','b','c','d','e','f'))
          )
SELECT y FROM x CONNECT BY level > 0;