Load 3.5.6 database into a 4.0.1 installation

[klaus_blass]

I have a 3.5.6 Enterprise database and want to send it to someone who has a 4.0.1 installation.
I DUMPed the database and want the other person to LOAD it.
Is this possible? If not, what other choices do I have?

Thanks,

Klaus

[david_rosenblum]

I would explore upgrading the 4.0.1 database to 4.0.7 first and making sure that all works before you bring in the 3.5 database. Just my opinion.

The doc is here: https://neo4j.com/docs/migration-guide/current/

Provided you did a neo4j-admin dump command https://neo4j.com/docs/operations-manual/current/tools/dump-load/
You can copy that dump file to the target server and follow the instructions here: https://neo4j.com/docs/migration-guide/current/upgrade-single-instance/

You will see you need to shut the 4.x db down and change neo4j.conf to allow the upgrade (see the doc above)

After you do the neo4j-admin load, you will need to get on the Neo4j Browser, login as an admin e.g. neo4j, switch to system and run: create database yourdatabasename

The doc has the instructions for a Causal Cluster also.

[klaus_blass]

Hi David,

Thanks for the description and links. Now, if I want to test this on my system, can I install 4.07 in addition to 3.5.6 and switch between the two? Say, my upgraded 4.07 database doesn't work properly, can I continue using my current 3.5.6 database (on the same machine)?
Oh, one more thing: the documentations says I need Java 11 for 4.0. Does a later version work as well? I currently have Java 14.

Thanks,

Klaus