Kinh Nghiệm về What is connection limit in mongodb atlas? Chi Tiết
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Docs trang chủ → MongoDB Atlas
Nội dung chính
- How many connections does MongoDB tư vấn?
- What is connection limit?
- Why is MongoDB not connecting to Atlas?
- Does MongoDB allow multiple connections?
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.
Connections occurs if the number
of active connections to the host meets the specified average.
Connections % of configured limit occurs if the number of open connections to the host exceeds the specified percentage.
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 M0/M2/M5, for example, are limited to 500 connections, and clusters of size M10 are limited to 1500 connections. Larger cluster tiers have higher connection limits. Different database access applications have different ways of implementing
connection pooling, which affects how many open connections your application maintains any given time.
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 M10 and greater can utilize the Test Failover option. The Test Failover procedure steps down the current
primary node and triggers an election, which drops all connections to the primary node.
Note
If 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:
Examining your database applications for flawed connection code. Situations in which connections are opened but never closed can allow old connections to pile up and eventually exceed the connection limit. Additionally, you may need to implement some form of
connection pooling.Upgrading to a larger Atlas cluster tier which allows a greater number of connections, if your user base is too large for your current cluster tier.
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 trang chủ → MongoDB Atlas
On this page
- Atlas Limitations
- Serverless Instance Limitations
- Atlas M0 (Free Cluster), M2, and M5 Limitations
- Unsupported Commands in Atlas
- Commands Available Only in Free Clusters
The following limitations apply to Atlas.
Atlas limits the number of the following items:
Components of particular type that you can create.
Connections allowed to a database deployment. For clusters, the number of connections allowed depends on the cluster tier.
To learn more, see Atlas Limitations.
Serverless instances don’t currently tư vấn all of the available Atlas features. MongoDB plans to add
tư vấn 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 không lấy phí clusters, or are unsupported on không lấy phí 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 không lấy phí clusters. To learn more, see Commands Available Only in Free Clusters.
How many connections does MongoDB tư vấn?
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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