CODEWITHSUNDEEP
androidfirebasefirebase-realtime-database
Abu Saeed
Abu Saeed

Reputation: 1170

Does RTDB query reduce bandwidth?

I have a list of users, assume 10k.
Now if I run a query like below:

query = FirebaseDatabase.getInstance().getReference().child("users")
                .orderByChild(SELECTED_QUERY)
                .limitToFirst(150);

Will it consume bandwidth of 150 users' data or 10k users' data?
This question may be silly, but I haven't found expected answer.

Upvotes: 0

Views: 48

Answers (1)

Frank van Puffelen
Frank van Puffelen

Reputation: 599956

Whether the SDK retrieves all users or just the first 150 depends on whether you've defined an index on SELECTED_QUERY. Without an index the SDK will retrieve all of users and filter locally on the client; with the index the filtering will happen on the server.

Given your comment, you'll need to add an index to your rules like this:

{
  "rules": {
    ...
    "users": {
      ...
      ".indexOn": "name"
    }
  }
}

Upvotes: 2

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