Neo4j 2.0 Merge with unique constraints performance bug?

Question

Here\'s the situation: I have a node that has a property ContactId which is set as unique and indexed. The node label is :Contact (node:Contact {ContactId:1})

I have an

Answer 1

Constraint checks are more expensive than just inserts. They also take a global lock on the constraint to prevent multiple insertion.

I saw you don't use parameters, but string substitiution, I really recommend to change that and go with parameters.

Also setting the whole node c to n triggers constraint check again.

Your probably want to use the ON CREATE SET clause of MERGE

(n in {nodes} |  
MERGE (c:Label {key : n.key}}) ON CREATE SET c.foo = n.foo, c.bar = n.bar )