text: autocommit off;
  DELETE FROM x_base_c1 
         WHERE  attr15_int_50vals_idx < 12
           AND  attr16_objpath.attr12_int_4vals_idx = 0;
  DELETE FROM x_virtual_c2 
         WHERE  attr15_int_50vals_idx < 24
           AND  attr16_objpath.attr12_int_4vals_idx = 1;
  DELETE FROM x_base_c0 
         WHERE  attr15_int_50vals_idx < 36
           AND  attr16_objpath.attr12_int_4vals_idx = 2;
  DELETE FROM x_virtual_c1 
         WHERE  attr15_int_50vals_idx < 50
           AND  attr16_objpath.attr12_int_4vals_idx = 3;
  ROLLBACK WORK;
  