Monitor Query Performance

Only available on M10+ clusters

The Query Profiler diagnoses and monitors performance issues. This monitoring can expose slow-running queries and their key performance statistics in the Atlas UI. You can explore a sample of historical queries for up to last 24 hours without additional cost or performance overhead.

Atlas collects and displays statistics from any of your mongod instances. Atlas displays this data in the Profiler section of an instance. To access the query profiler, click Metrics for that instance in the project panel then click Profiler.

The Profiler displays one aspect, such as Operation Execution Time, that could reveal slow database operations over a set time frame. It displays this data in both a chart and a table that each can filter on aspect and time frame.

Atlas manages the threshold for slow operations for each mongod host based on average operation execution time on that host.


To opt out of the Atlas-managed slow operation threshold and instead use a fixed slow query threshold of 100 milliseconds, use the Atlas API. See Disable Managed Slow Operation Threshold.

Please read the following considerations before you enable profiling.

Profile data may include sensitive information including the content of database queries. Ensure that exposing this data to Atlas is consistent with your information security practices.

The Query Profiler displays up to the first of the following limits:

  • the most recent 10,000 operations, or
  • the most recent 10MB of logs.

Atlas displays no more than 10,000 data points in the Profiler charts.

Log data is processed in batches. Data can be delayed up to five minutes from realtime.

Atlas enables Profiling by default.

To disable profiling:

  1. Click Project Settings in the left navigation.
  2. Toggle Performance Advisor and Profiler to Off.

Above the chart, select the metric and time period you want to see.

  1. Select the metric from the Display menu. Accepted options are:

    • Operation Execution Time (default)
    • Keys Examined
    • Docs Returned
    • Examined:Returned Ratio
    • Num Yields
    • Response Length
  2. Select the time period from the View Last menu. Accepted options are:

    • 24 hr (default)
    • 12 hr
    • 6 hr
    • 1 hr
    • 15 min

Above the table, select the namespace, operation type, and metric you wish to profile:

  1. Click All Namespaces to change which combination of databases and collections to profile.
  2. Click All Operations to change which operations you want to profile.
  3. Click Operation Execution Time to change which metric you want to profile. Accepted options are:

    • Operation Execution Time (default)
    • Keys Examined
    • Docs Returned
    • Examined:Returned Ratio
    • Num Yields
    • Response Length
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On this page

  • Considerations
  • Enable and Disable Profiling
  • Profiler Interface