[英]Speed up Neo4j relationship creation
I have a CSV file with 1 million rows and 3 columns (NODE_ID_1, PROPERTY_COLUMN, NODE_ID_2).我有一个 CSV 文件,它有 100 万行和 3 列(NODE_ID_1、PROPERTY_COLUMN、NODE_ID_2)。
I also have an already existing Neo4j database containing Node label.我还有一个已经存在的 Neo4j 数据库,其中包含节点label。 I should create the relationship RELATED_TO between nodes.我应该在节点之间创建关系RELATED_TO 。 I use the following cypher query to create the relationship between nodes but it is too cumbersome (it takes more than a day to complete the rel creation).我使用下面的cypher查询来创建节点之间的关系但是太麻烦了(完成rel创建需要一天多的时间)。 Do you have some tips to quickly generate the relationship?你有一些快速建立关系的技巧吗?
CALL apoc.periodic.iterate(
"LOAD CSV WITH HEADERS FROM $url AS row
WITH row {.*, PROPERTY: toFloat(row.PROPERTY_COLUMN)}
RETURN row",
"MATCH (src:Node {node_id : row['NODE_ID_1']}), (dst:Node {node_id : row['NODE_ID_2']})
MERGE (src)-[r:RELATED_TO]-(dst)
SET r += {property_column: row['PROPERTY_COLUMN']}
",
{batchSize: 1000, batchMode: "BATCH", parallel:false, params: {url: 'file:///path_to_file'} })
Do you have an index on:Node(node_id)?你有一个索引:Node(node_id)吗? You NEED this for your MATCH operations to be performant.你需要这个才能让你的 MATCH 操作高效。
https://neo4j.com/docs/cypher-manual/current/administration/indexes-for-search-performance/ https://neo4j.com/docs/cypher-manual/current/administration/indexes-for-search-performance/
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