text: // @tags: [requires_capped]
  t = db.scan_capped_id;
  t.drop();
  
  x = t.runCommand("create", {capped: true, size: 10000});
  assert(x.ok);
  
  for (i = 0; i < 100; i++)
      t.insert({_id: i, x: 1});
  
  function q() {
      return t.findOne({_id: 5});
  }
  
  function u() {
      var res = t.update({_id: 5}, {$set: {x: 2}});
      if (res.hasWriteError())
          throw res;
  }
  
  // SERVER-3064
  // assert.throws( q , [] , "A1" );
  // assert.throws( u , [] , "B1" );
  
  t.ensureIndex({_id: 1});
  
  assert.eq(1, q().x);
  q();
  u();
  
  assert.eq(2, q().x);
  