# Modifying a Neptune Analytics graph
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 You can change the settings of a Neptune Analytics graph to accomplish tasks such as changing public connectivity or its provisioned-memory. 

 It is recommended that you test any changes using a test graph before modifying any production graphs, so that you are able to fully understand the impact of each change. 

**Memory scaling**

 Neptune Analytics is a memory-optimized graph database engine for analytics, which stores data in-memory to enable optimal performance for algorithmic and analytical workflows. A Neptune Analytics graph can have the instance size upscaled or downscale the database to a smaller or larger memory size by updating the graph to higher m-NCU. The minimum size of the mNCU chosen must be capable of storing all the data in the graph, smaller mNCU values than that required by the graph will result in `ValidationException` errors.