I have built a DB using this batch script
<http://jexp.de/blog/2014/10/flexible-neo4j-batch-import-with-groovy/>
My DB contains about 53 millions node and about 90 millions relationships.
I want to perform a query to find all the neighbors of a certain node. So
I'm using the following query (connect to the DB engine with JAVA):
String query = String.format("MATCH (a { name: '%s' }) -[*0..%d]-(x) RETURN
x", nodeName, range);
The query completes very fast, but when I try to read the result using the "
*IteratorUtil*" class, whatever function I call
(count, asIterable, first..) the program stops responding.
I'm using the following configuration for the JVM:
*-Xms512m*
*-Xmx2g*
*-XX:-UseGCOverheadLimit*
*-XX:MaxPermSize=512m*
*-XX:+UseConcMarkSweepGC *
My code:
Transaction tx = mGraphDB.beginTx();
try
{
String query = String.format("MATCH (a { name: '%s' }) -[*0..%d]-(x)
RETURN x", nodeName, range);
result = mDBEngine.execute( query );
Iterator<Node> n_column = result.columnAs( "x" ); for ( Node node :
IteratorUtil.asIterable( n_column ) )
{
res.nodesIDList.add(i, (Integer)node.getProperty(name));
}
tx.success();
...
}
catch (Exception e)
{
tx.failure();
...
}
finally
{
tx.close();
}
Any idea on how to fix this?
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