如何提高 Firebase 实时数据库的性能

Question

We are developing an app in dart wherein we need to fetch around more than 50K rows at once (doing it when app loads) and then data will be used in other sections of app for further calculations. We are using Firebase Realtime database and we are facing some serious performance issues.

Its currently taking somewhere around 40 seconds to load 50K rows(currently using free database version, not sure if that would the reason), but we have also observed that when multiple users uses the app, it starts to take around 1 minute 20 sec to load 50K rows and Peak goes to 100%.

Can you please suggest how can we improve performance in firebase realtime database?

If I break the data in two collection but keep it in same JSON file, would that help?

Can it be because we are using currently free database version for testing?

We have tried creating indexes in "Rules" section on 1 Key field but that did not help much. Is there any way we can improve this?

Answer 1

Can it be because we are using currently free database version for testing?

All Firebase Realtime Database instances run on the same infrastructure. There is no difference based on the plan your project is on.

Can you please suggest how can we improve performance in firebase realtime database?

The best way to improve performance is to only load data that you're going to show to the user right away. In any client-side application it's unlikely that the user will look at 50K items, let alone look at them straight when the application starts.

If you need 50K items to show the initial data to the user, that typically means that you're aggregating that data in some way, and showing that aggregate to the user. Consider doing that aggregation when you write the data to the database, and store the aggregation result in the database. Then you can load just that result in each client, instead of having each client do its own aggregation.

For more data modeling tips, read NoSQL data modeling and watch Firebase for SQL developers . I'd also recommend watching Getting to know Cloud Firestore , which is for Cloud Firestore, but contains many great tips that apply to all NoSQL databases.

Answer 2

Add the field that you are using for the query to the Realtime Database rules.

For example

{
  "rules": {
    "v1": {
            "history": {
                ".indexOn": "refresh_at"
            }   
        }
    }
}