: C:\Users\\AppData\Local\Neo4j\Relate\Data\dbmss\dbms-dd16c384-78c5-4c21-94f3-b0e63e6c4e06\data\databases\neo4j already contains data, cannot do import here I tried the above method, but still received the error: Import error: C:\Users\\AppData\Local\Neo4j\Relate\Data\dbmss\dbms-dd16c384-78c5-4c21-94f3-b0e63e6c4e06\data\databases\neo4j already contains data, cannot do import hereĬaused by:C:\Users\\AppData\Local\Neo4j\Relate\Data\dbmss\dbms-dd16c384-78c5-4c21-94f3-b0e63e6c4e06\data\databases\neo4j already contains data, cannot do import here It's not possible to BULK import when the database is not empty. Method 2: Reset database for BULK Import Tool ideal for importing millions of nodes at once quickly. However, despite being convenient, this approach is not suitable in case of using command neo4j-admin.bat import for BULK import, i.e. # All nodes and relationships.ĬALL (,true) YIELD label, key RETURN * In Neo4j Browser, or in Py2neo with n() ( link). Method 1: Simply delete all nodes/relationships/indexes/constraints In my experience, there are two ways to reset a Neo4j database, depending on what you need. To clear/reset neo4j database:ġ - Switch to system database: :use systemĢ - Show all databases created with the instance: SHOW DATABASESģ - Run the command to clear the database. When neo4j is initiated, it is possible to access two databases, a system database and a default ( neo4j) database. This will create the database (if it does not already exist) or replace an existing database with a clean one. Cypher’s command for this is CREATE OR REPLACE DATABASE.
The approach is similar to other DBMSs where we can drop and recreate the database, but retain everything else.
However, with multiple databases, we cannot do that unless we are comfortable losing everything from our other databases in that instance. When dealing with a single instance and single database approach, users can delete the entire instance and start fresh.
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One final administrative difference is how to completely clean out one database without impacting the entire instance with multiple databases.
According to Neo4j manage multiple databases documentation:
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