I'm modeling out my ArangoDB database and the list of edge collections I've created is growing and growing. I could just combine all of the edges into a single edge collection called relations with a type parameter. It would certainly clean up my list of tables but would it have any effect on my traversal queries? Would it have any positive or negative effects?
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1 Answers
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You should add a vertex-centric index for the edge collection. This allows you to use a single edge collection without a big performance impact.
You can essentially add indexes on the "_from" or "_to" field and your type attribute.
If your traversal queries need both directions you need to add two indexes one on "_to"+"_type" and one on "_from"+"_type"
The example in the documentation just suggests a skiplist index, but you should probably use a hash-index because the type field contains a discrete value.
https://docs.arangodb.com/3.2/Manual/Indexing/IndexBasics.html#vertex-centric-indexes
