How to delete/create databases in Neo4j?

Question

Is it possible to create/delete different databases in the graph database Neo4j like in MySQL? Or, at least, how to delete all nodes and relationships of an existing graph t

Answer 1

From Neo4j 2.3,

We can delete all nodes with relationships,

MATCH (n)
DETACH DELETE n

Currently there is no any option to create multiple databases in Noe4j. You need to make multiple stores of Neo4j data. See reference.

Answer 2

As of version 3 I believe it is now possible to create separate database instances and thus their location is slightly different.

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

The --into retail.db is obviously the target database, which must not contain an existing database.

On my Ubuntu box the location is in:

/var/lib/neo4j/data/databases where I currently see only graph.db which I believe must be the default.

Answer 3

quick and dirty way that works fine:

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

Answer 4

Easiest answer is: NO

The best way to "start over" is to

• move to another empty data folder

or

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

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

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

Answer 5

even more simple command to delete all nodes and relationships:

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

Answer 6

In Neo4j 2.0.0 the ? is no longer supported. Use OPTIONAL MATCH instead:

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