Hierarchy of accessibility outdated?

General Graph Academy
1

In the Neo4j query tuning course, we learn the Hierarchy of accessibility
But, knowing that from version 4.3 we can now create index on a relationship property and therefore I guess anchor on a relationship, is this Hierarchy of accessibility outdated?

Here is the cost of access from least expensive to most expensive:

  1. Anchor node label, indexed anchor node properties
  2. Relationship degrees
  3. Relationship types and direction
  4. Non-indexed anchor node properties
  5. Downstream node labels
  6. Relationship properties, downstream node properties
2

Yes we just had this discussion internally.

Basically relationships are now also accessible by type and property, so equivalent to (1) when there is an index.

Screen Shot 2021-11-11 at 10.15.22 AM
Screen Shot 2021-11-11 at 10.15.22 AM1217×676 94.9 KB

3

Hello @michael.hunger :slight_smile:

In your picture, anchor types correspond to indexed relationships?

Regards,
Cobra

4

I can see that you might simplify the hierarchy of accessibility model too.
And I'm guessing this it not the final form.

I can't wait for the new / updated query tuning course :)
I think, I might be wrong, node labels indexes must now be explicitly define in Neo4j 4.3.

Knowing that for a MATCH, only the anchor node will actually use labels indexes, for me this modification make sens and probably reduce the memory use by the graph. Downside is, it makes Neo4j a bit less user friendly in terms of speed when you don't know it.

But a explicit warning could be add to the browser to inform the new user.
Anyway thanks for the info.