How to delete / create databases in Neo4j?

Question

Is it possible to create / delete various databases in the Neo4j graph database , as in MySQL? Or at least how to remove all nodes and relationships of an existing graph to get a clean tuning for tests, for example, using shell commands similar to rmrel or rm ?

Answer 1

You can simply delete the entire graph directory with rm -rf , because Neo4j does not store anything outside this:

 rm -rf data/* 

In addition, you can, of course, iterate over all the nodes and delete their relationships and the nodes themselves, but this can be too expensive just for testing ...

Answer 2

an even simpler command to remove all nodes and links:

 MATCH (n) OPTIONAL MATCH (n)-[r]-() DELETE n,r 

Answer 3

Creating a new database in Neo4j

Before launching the neo4j community, click the browse button

and select another directory

and click the start button.

New database created in this directory

Answer 4

From Neo4j 2.3,

We can remove all nodes with relationships ,

 MATCH (n) DETACH DELETE n 

There is currently no way to create multiple databases in Noe4j. You need to make several Neo4j data stores. See link .

Answer 5

For anyone who needs a clean graph to run a test suite, https://github.com/jexp/neo4j-clean-remote-db-addon is a great extension to clear db through a REST call. Obviously, however, do not use it in production!

Answer 6

quick and dirty way that works great:

 bin/neo4j stop rm -rf data/ mkdir data bin/neo4j start 

Answer 7

Run your test code on another instance of neo4j.

• Copy the neo4j directory to a new location. Use this for testing. cd to the new directory.
• Change the port so you can run your tests and use it at the same time. To change the port, open conf/neo4j-server.properties and set org.neo4j.server.webserver.port to unused.
• Run the test server during configuration. Make ./neo4j stop and rm -rf data/graph.db if rm -rf data/graph.db .

See neo4j for more details : How to switch the database? and docs .

Answer 8

Is there a Neo4j 2.0.0? is no longer supported. Use the OPTIONAL MATCH instead:

 START n=node(*) OPTIONAL MATCH (n)-[r]-() delete n,r; 

Answer 9

The simplest answer: NO

The best way to get started is

• go to another empty data folder

or

• close Neo4j completely
• delete old data folder
• restart Neo4j and set the empty folder to the data folder

There is a way to remove all nodes and relationships (as described here )

 MATCH (n) OPTIONAL MATCH (n)-[r]-() DELETE n,r 

Answer 10

In 2.0.0-M6, you can run the following Cypher script to remove all nodes and relationships:

 start n=node(*) match (n)-[r?]-() delete n,r 

Answer 11

Starting with version 3, I believe that now you can create separate database instances and, therefore, their location is slightly different.

Referring to: https://neo4j.com/developer/guide-import-csv/

. --into retail.db is obviously a target database that should not contain an existing database.

In my Ubuntu field, the location is in:

/var/lib/neo4j/data/databases Here I see only graph.db , which, in my opinion, should be the default.

Answer 12

You can delete your data files, and if you want to go this way, I would recommend deleting only your graph.db, for example. Otherwise, you are going to spoil your authentication information.