Firebase Realtime Database显示连接数与实际不符的原因及查看方法

Hey there! I've run into this exact confusion before, so let me walk you through what's happening and how to get the real-time connection data you need.

Why the Connection Count Stuck at Peak Value (100/100) #

The number shown on the left (100 in your case) is actually the historical maximum simultaneous connections your database has ever hit—not the current real-time connection count. This is intentional behavior in the Firebase Console: once your database reaches a new peak connection number, that value stays displayed to show you the highest load it's handled, even as connections drop off later. The "/100" represents your database's current connection limit (you can adjust this if needed, but that's a separate setup step).

How to View Actual Real-Time Connection Numbers #

Here are three reliable ways to get the active simultaneous connection count:

• Use the Firebase CLI
  Open your terminal, make sure you're logged into Firebase (firebase login) and have selected your target project (firebase use <your-project-id>), then run this command:

  firebase database:info
  

  This will return a summary of your database metrics, including the connections field—this is the real-time number of active simultaneous connections.

• Leverage Cloud Monitoring
  Firebase integrates with Cloud Monitoring to provide detailed, live metrics. Here's how to access it:

  1. Go to your Firebase Console, select your project.
  2. Navigate to Analytics > Monitoring (or directly access the Cloud Monitoring console linked from your Firebase project dashboard).
  3. Look for the firebase.database/connections metric. You can add this to a custom dashboard to track real-time connection counts, set up alerts for unusual connection levels, and view full historical trends beyond just the peak value.

• Programmatic Tracking with the Admin SDK
  If you need to monitor connections within your own code, use the Firebase Admin SDK to query database metadata. For example, in Node.js, you can use the database.instances().get() method to retrieve metrics including current connection counts (note: this requires proper IAM permissions for your service account).

It's easy to mix up peak vs. current connection numbers at first, but once you know where to look, getting real-time data is straightforward!

内容的提问来源于stack exchange，提问作者will cuny