Graph Database Not updated Neo4j - neo4j

Question

I am using neo4j version 3.1.0 . i have created 20 million graph.Each graph consists of 9 nodes with their respective properties.I am using embedded mode (api 3.1.0) .I am trying to change the property of a node .In the runtime I changed property of a node but it is not reflecting in the database when i am trying to fetch the node property using neo4j shell.
The database size is almost 20GB.I am running it on a server. i Guess that the changes are taking place in cache but it is not reflected in graph database.What changes should i make to get updated in the graph database???
try(Transaction tx=GraphCreation.getInstance().dbService.beginTx()){
Node n= GraphCreation.getInstance().dbService.findNode(MyLabels.IMSI,"IMSI" ,"A"+0);
n.setProperty("MSISDN", "Z"+0);
tx.success(); // commit
} catch(Exception e)
{
e.printStackTrace();
}
try(Transaction tx=GraphCreation.getInstance().dbService.beginTx())
{
String cql ="match(a:IMSI{IMSI : 'A0'}) return a.MSISDN";
Result result= GraphCreation.getInstance().dbService.execute(cql);
while ( result.hasNext() )
{
Map<String, Object> row = result.next();
for ( String key : result.columns() )
{
System.out.printf( "%s = %s%n", key, row.get( key ) );
}
}
tx.success();
timerContext.close();
} catch(Exception e)
{
e.printStackTrace();
}

Answer 1

The issue has been solved .Graph DB hasn't been shutdown properly when trying to stop the code by pressing Cntrl +C.Hence to handle this case add this snippet to your code.
private static void registerShutdownHook( final GraphDatabaseService graphDb )
{
// Registers a shutdown hook for the Neo4j instance so that it
// shuts down nicely when the VM exits (even if you "Ctrl-C" the
// running application).
Runtime.getRuntime().addShutdownHook( new Thread()
{
#Override
public void run()
{
graphDb.shutdown();
}
} );
}