Cypher query gives java.lang.OutOfMemoryError

Question

When I type this query in the Neo4j shell:

MATCH (b:PHARMA)-[r:HAS_DONATED]->(a:DOCTOR)
WITH a,r,b, r.DECL_AVANT_MONTANT as total, COUNT(r) as count
MERGE (b)-[:RELATIONSHIP {
totalDECL: total,
numberDECL: count
}]->(a);

I receive this message:

Error occured in server thread; nested exception is: java.lang.OutOfMemoryError: Java heap space

Any idea on how to get around this?

Answer 1

I solved my problem by using this query:

USING PERIODIC COMMIT 2000
LOAD CSV WITH HEADERS FROM "file:c:/sunshine.anonymes.csv" AS line
FIELDTERMINATOR ','
MATCH (b:DOCTOR {ID: line.BENEF_PS_ID})
MATCH (a:PHARMA {NAME: line.LABO})
MERGE (a)-[r:IS_LINKED_TO]->(b)
ON CREATE SET r.numberDECL = 1, r.totalDECL = toINT(line.DECL_AVANT_MONTANT)
ON MATCH SET r.numberDECL = r.numberDECL +1, r.totalDECL = line.totalDECL + r.totalDECL;

Basically, I'm creating the relationship during the csv import and updating the properties throughout the process.

Thank you for your help guys!