Monitor Query Performance
Only available on M10+ clusters and serverless instances
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
View Monitoring for that instance in the project panel then
click Profiler.
You access the Query Profiler for a serverless instances from the Monitoring tab.
The Profiler displays one aspect, such as Operation Execution Time or Server Execution Time (serverless instances), 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 Administration API. See Disable Managed Slow Operation Threshold.
For M0, M2, M5 clusters and serverless instances,
Atlas disables the Atlas-managed slow query operation
threshold by default and you can't enable it.
Considerations
Security
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.
Data Analysis Limitations
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.
Data Display Limitations
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.
Enable and Disable Profiling
Atlas enables Profiling by default.
To disable profiling:
- Click Project Settings in the left navigation.
- Toggle Performance Advisor and Profiler to Off.
Profiler Interface
Profiling Chart
Above the chart, select the metric and time period you want to see.
Select the metric from the Display menu. Atlas accepts:
- Default: Operation Execution Time or Server Execution Time (serverless instances)
- Keys Examined
- Docs Returned
- Examined:Returned Ratio
- Num Yields
- Response Length
Select the time period from the View Last menu. Atlas accepts:
- 24 hr (default)
- 12 hr
- 6 hr
- 1 hr
- 15 min
Profiling Table
Above the table, select the namespace, operation type, and metric you wish to profile:
- Click All Namespaces to change which combination of databases and collections to profile.
- Click All Operations to change which operations you want to profile.
Click Operation Execution Time or Server Execution Time (serverless instances) to change which metric you want to profile. Atlas accepts:
- Default: Operation Execution Time or Server Execution Time (serverless instances)
- Keys Examined
- Docs Returned
- Examined:Returned Ratio
- Num Yields
- Response Length