title: what's the over head per node and per edge for single entry in neo4j
body: <p>I have a graph of integers (say 12 bytes).
    Each node has 200 outgoing edges. 
    I have 100*10^6 nodes.</p>
  
  <p>Given the 'key' weights 12b what is the total size, when it is represented in neo4j?
    Whats is the cost of edge?</p>
  
  <p>It this size of neo4j possible to query? --- I mean of course some internal constrains, the time of the query would express I/O performance (I guess?).</p>
  
  <p>I am interested in query: which node is connected to node X.</p>
  
  <p>What about JVM limits? Any chance to bump into something?</p>