text: -- @Description One session allocating > VLIM in critical section, can proceed
  -- @author George Caragea
  -- @vlimMB 900 
  -- @slimMB 0
  
  -- content/segment = 0; size = 901MB; sleep = 0 sec; crit_section = true
  select gp_allocate_palloc_test_all_segs(0, 901 * 1024 * 1024, 0, true);
  