Is it possible to index labels in Titan?

问题

When I run a query like this:

g.V().hasLabel("myDefinedLabel").values("myKey").next()

It prints

20:46:30 WARN  com.thinkaurelius.titan.graphdb.transaction.StandardTitanTx  - 
Query requires iterating over all vertices [(~label = myDefinedLabel)].
For better performance, use indexes

So, I guess to solve this issue, I need to index the label. Is there anyway to do this?

I tried doing the normal procedure to create an index described here in Titan docs but the label is not a regular property key to index.

Assuming I want to create a composite index for labels, how to do it?

回答1:

Titan doesn't allow you to index labels, and according to the devs it isn't something they're interested in enabling.

来源：https://stackoverflow.com/questions/36295117/is-it-possible-to-index-labels-in-titan