Why system.profile collection is not updated in mongodb?

Question

I have enabled profiling for mongodb cluster with 3 servers by using below configuration: operationProfiling: mode: all slowOpThresholdMs: 200 slowOpSampleRate: 0.98

1. Only 50 entries are visible in system.profile collection. After couple of hours, there are no more updates. Current size of collection:1.5 KB, default is 1MB. What could be possible reasons for this and how i can find the root cause?

2.In a replica of three, I am able to run queries against profile collection only on primary server. What is the reason for this?

Any help in resolving above queries is highly appreciated.

Answer 1

There should be a 'system.profile' collection for each database where operations for that database are entered.

• Make sure you are checking the right database.
• Check with the profile database command or the getProfilingLevel shell helper to make sure it is set the way you expect.