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How do I set maximum connections in MongoDB?
5 Answers
- Edit the /etc/sysctl. conf file and add fs. file-max = 50000 . This sets the maximum file descriptors that can run as a system-wide limit.
- Running ulimit -n 50000 sets the user-wide limit for the maximum number of file descriptors open.
How do I see how many connections I have in MongoDB?
We can get the information explicitly about the number of connections made to the server by running the command db. serverStatus(). connections from any of the MongoDB Shell connected to the Server.
How many concurrent connections do you need for MongoDB?
I don’t know if you’ll be able to scale to 20k+ concurrent users easily, since MongoDB uses a new thread for each new connection. You want your web app backend to have just one to a few database connections open and just use those in a pool, particularly since web usage is very asynchronous and event driven.
Why does MongoDB lock both databases at the same time?
Therefore, MongoDB must lock both the collection’s database and the local database. The mongod must lock both databases at the same time to keep the database consistent and ensure that write operations, even with replication, are “all-or-nothing” operations.
Is it possible to pool connections in MongoDB?
One notable exception is setups where your app spawns a new process for each request, such as CGI and some configurations of PHP. Whatever driver you’re using, you’ll have to find out how they handle connections and if they pool or not.
Why does MongoDB use multi granularity locking?
MongoDB uses multi-granularity locking [ 1] that allows operations to lock at the global, database or collection level, and allows for individual storage engines to implement their own concurrency control below the collection level (e.g., at the document-level in WiredTiger).