Adding an index on an Integer field with many repeating values results in very slow "find()" queries about objectbox-java

[sspanak]

Oh, I didn't know this. From what I've read, it applies to relational databases too. Thanks for sharing this knowledge!

Either way, it is not a problem for me. I just ended up not using an index and it is all good.

On a side note, I can see you have tagged the issue more info required. Do you need anything else? From my perspective, the problem is solved, so...

[greenrobot-team]

Thanks for reporting and including all relevant details!

However, this behavior is kind of expected from an index. An index is only beneficial if most objects have unique values, so that for a query only a small amount of objects matches. Only then is looking up objects via the index faster than scanning all objects (= no index).

If most objects have the same value e.g. many objects match, the performance actually decreases compared to having no index on the property, as you discovered.

This is also independent of the property type.

[greenrobot]

OK, thanks for the feedback; we'll close the issue.