Environment:
  - Neo4j 2.0
  - Oracle JDK 1.7
  - OS X 10.9
  - Node 0.10.21

I have a number of unit tests which exercise Neo4j via the REST API. Before 
each test, the database is cleared using the following query:

MATCH (n) OPTIONAL MATCH (n)-[r]-() DELETE n, r

This works fine for a while and then the Neo4j server becomes unresponsive 
for this query.  When the query is issued, there is no response from the 
server and my test eventually times out.  Once the server is in this state, 
I can also issue this query from the Neo4j browser.  After a long delay, 
the browser shows an "Unknown Error" message.  I can issue other queries 
successfully, but the "delete all" query continues to time out or error out 
until I restart the server.  There is nothing in the neo4j.0.0.log or 
console.log that indicates any problem.

Any idea how I can debug this?

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