One approach you can try if you get temporary out of memory errors from the server is to explicitly pace the timing of requests you make. You can do this in any SDK by creating a timer and only perform a Couchbase request after a specific timed interval. This will provide a slight delay between server requests and will reduce the risk of an out of memory error. For instance in Ruby:

c.set("foo", 100)
n = 1

c.run do
    c.create_periodic_timer(500000) do |tm|
          c.incr("foo") do
              if n == 5
                  tm.cancel
              else
                  n += 1
              end
          end
    end
end

In this example we create a sample record foo with the initial fixnum value of 100. Then we create a increment count set to one, to indicate the first time we will create a Couchbase request. In the event loop, we create a timing loop that runs every .5 seconds until we have repeated the loop 5 times and our increment is equal to 5. In the timer loop, we increment foo per loop.