CODEWITHSUNDEEP
neo4jcypher
tdudgeon
tdudgeon

Reputation: 365

Setting property on large number of nodes

I'm hitting a OutOfMemoryError when trying to set a property for a large number of nodes in Neo4j using cypher.

The approach I'm using is like this:

MATCH (n:MYLABEL) SET n.num_visits = 0 RETURN count(n)

This works OK when the number of nodes matched is in the 100,000s range, but when it get to the millions of nodes range I hit the OutOfMemoryError problem after a very long delay. What is the best approach to handle this without memory problems and to get the operation to complete relatively quickly?

Upvotes: 1

Views: 114

Answers (1)

stdob--
stdob--

Reputation: 29167

Try apoc.periodic.iterate procudere from the APOC library. For example:

CALL apoc.periodic.iterate (
  "MATCH (n:MYLABEL) RETURN n",
  "SET n.num_visits = 0", 
  {
     batchSize: 100000, 
     parallel: true
  }
)

Upvotes: 2

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