What is connection limit in mongodb atlas?
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Docs Home → MongoDB Atlas Show Connection alerts typically occur when the maximum number of allowable connections to a MongoDB process has been exceeded. Once the limit is exceeded, no new connections can be opened until the number of open connections drops down below the limit. You can configure the following alert conditions in the project-level alert settings page to trigger alerts.
Exceeding the connection limit for an Atlas cluster may occur for a number of reasons. Different Atlas tiers have different
connection limits; clusters of size To resolve a connection alert condition, restart the application which is currently making connections to your Atlas cluster. Restarting the application terminates all existing connections opened by the application and allows the Atlas cluster to resume normal operations. Atlas clusters of size NoteIf your application connects exclusively to a secondary node, you may need to perform the Test Failover procedure several times to make sure the applicable secondary node rotates its position within the replica set and drops its connections. Test Failover is usually the preferable solution, but another possible solution is to restart the application currently making connections to your Atlas cluster. Restarting the application terminates all existing connections and allows the Atlas cluster to resume normal operations. Connection alerts are generally a symptom of a larger problem. Employing one of the strategies outlined above will fix the immediate problem, but a permanent solution usually requires either:
View the Connections chart to monitor the total number of connections to the cluster. Monitor connections to determine whether the current connection limits are sufficient. If necessary, upgrade the cluster tier. To learn more, see View Cluster Metrics. Docs Home → MongoDB Atlas On this page
The following limitations apply to Atlas. Atlas limits the number of the following items:
To learn more, see Atlas Limitations. Serverless instances don't currently support all of the available Atlas features. MongoDB plans to add support for more configurations and capabilities on serverless instances over time. To learn more, see Serverless Instance Limitations. Free clusters have certain configuration limitations, operational limitations, and driver requirements. To learn more, see Atlas M0 (Free Cluster), M2, and M5 Limitations. Some commands have limitations on free clusters, or are unsupported on free clusters. Some commands have limitations on M10+ clusters, or are unsupported on M10+ clusters. Also, some commands are unsupported on serverless instances. To learn more, see Unsupported Commands in Atlas. Atlas supports some commands only on free clusters. To learn more, see Commands Available Only in Free Clusters. How many connections does MongoDB support?MongoDB configuration
Even MongoDB itself has an option to limit the maximum number of incoming connections. It defaults to 64k.
What is connection limit?A connection limit that restricts the total number of UDP, ICMP, and other raw IP connections that may be created for a single server publishing or access rule during one second.
Why is MongoDB not connecting to Atlas?Check that you are using the correct username and password for your database user, and that you are connecting to the correct database deployment. Check that you are specifying the correct authSource database in your connection string.
Does MongoDB allow multiple connections?MongoDB allows multiple clients to read and write the same data. To ensure consistency, MongoDB uses locking and concurrency control to prevent clients from modifying the same data simultaneously.
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