View Real Time Metrics
On this page
Note
To view real-time metrics, click the Metrics button for the desired deployment, then click Real Time.
Monitor deployment metrics to identify performance issues and determine whether your current deployment meets your requirements. To learn more about the metrics available to monitor your deployments, see Review Available Metrics.
To access this feature, you must either:
Belong to the project
Have the Global Monitoring Admin role or the Global Owner role
In the upper-right corner, you can click to view the metrics in a Table or Graph.
Enable or Disable Real-Time Performance Panel for a Project
Note
Required Privileges
To enable Real-Time Performance Panel for a project,
you must have the Project Owner role for the project.
Ops Manager enables the Real-Time Performance Panel by default. To toggle this setting:
Table View
Fields | Displays |
|---|---|
Commands Queries Updates Deletes Inserts GetMores | Number of the specified operations
(commands, queries, etc.) that
mongostat
has reported. |
Time / Read Time / Write Time / Command | Latency metrics for current read requests,
write requests, and other database commands. Available
only for MongoDB 3.4+. To learn more, see opLatencies
at serverStatus. |
Scanned / Returned Scanned Objects / Returned | Ratio of documents and objects scanned to
documents and objects returned in current queries. These
metrics are useful in determining if and how a query
uses an index. To learn more, see
Analyze Query Performance. |
Active Readers Active Writers Queued Readers Queued Writers | Number of active reads, queued reads, active
writes, and queued writes that
mongostat
has reported. |
Lag Time | Time required to replicate operations from
the primary to the secondary members of a replica set.
Available only for secondary members of a replica set.
To learn more, see
Replica Set Secondary Members. |
CPU Disk IOPS Sys Mem | Statistic depending on the operating system of the nodes in your cluster:
|
Connections Bytes In Bytes Out | Number of current connections to the
machine hosting MongoDB and the number of inbound and
outbound bytes that
mongostat
has reported. |
Click to hide or display fields from the table.
Graph View
Chart | Displays |
|---|---|
Connections, Network In, Network Out | Number of current connections to the machine
hosting MongoDB and the number of inbound and outbound
bytes that
mongostat
has reported. |
CPU, Disk IOPS, and Sys Mem | Statistic depends on the operating system of the nodes in your cluster:
|
Operations | Number of operations as reported by
mongostat. |
Query Execution Times | Displays latency metrics for current read requests,
write requests, and other database commands. Available
only for MongoDB 3.4+. To learn more, see opLatencies
at serverStatus. |
Query Targeting | Ratio of documents and objects scanned to
documents and objects returned in current queries. These
metrics are useful in determining if and how a query
uses an index. To learn more, see
Analyze Query Performance. |
Reads & Writes | Number of active reads, queued reads, active
writes, and queued writes as reported by
mongostat. |
Replication Lag | Time required to replicate operations from
the primary to the secondary members of a replica set.
Available only for secondary members of a replica set.
To learn more, see
Replica Set Secondary Members. |
Hottest Collections | Collections with the most operations that mongotop has reported. For each hot collection, the table also displays the Utilization Percent for the collection. Utilization Percent is calculated from the read and write times that mongotop has reported during a sample period. Specifically, the Utilization Percent is the percentage (rounded to the nearest 0.1%) of the read and write times for a collection relative to the read and write times for all collections in the deployment during the sample period. If no read and write operation occur during this period, the Utilization Percent may be 0%. The hottest collections correspond to the most current time displayed in the charts. That is, if the display is running (not paused), the collections correspond to the hottest collections at the current timestamp. If the display is paused, the collections correspond to the hottest collections at the paused time. |
Slowest Operations | Slowest operations that the db.currentOp() has reported. The operations correspond to the most current time displayed in the charts. That is, if the display is running (not paused), the operations correspond to the slowest operations at the current timestamp. If the display is paused, the operations correspond to the slowest operations at the paused time. Click the operation to view the detailed JSON document that db.currentOp() has reported for the operation. Users with the Data Access Admin role can access buttons to force stop an operation or an inactive transaction in the operation details panel: To stop a slow operation:
To learn more about transactions, refer to the MongoDB manual. |
To hide/show a metric in the graph, click the color box for the metric.
Read Exact Metrics from Graph View
If you pause the Graph view of the Real-Time Performance Panel, you can hover over a line graph to see its exact value, along with the slowest operations and hottest collections, at a given moment in time.
Stop and Restart Display
To stop the update of the metrics displayed, click Pause. Pause only stops the update of the displays and doesn't pause the collection of the underlying data.
To restart the display updates, click Play.