How concurrency is handle in MongoDB?
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).
What is diagnostic data in MongoDB?
The diagnostic. data file contains the result of db. serverStatus() command in binary format. This will be used by the MongoDB engineers to analyze the behavior of the server if any error happens. It is not necessary to take a backup of this file.
How do you check that MongoDB is running?
service mongod status: Displays the status of MongodB service as like the screenshot given below. systemctl status mongod: Displays the same status of MongoDB service as like above command as shown in figure 1. pgrep mongo: Prints the process ID of running mongo instance.
What is profiler in MongoDB?
The database profiler collects detailed information about Database Commands executed against a running mongod instance. This includes CRUD operations as well as configuration and administration commands. The profiler writes all the data it collects to a system.
How to check the current connection in MongoDB?
I am using a db.currentOp () to check the current connection in Mongodb. How can I get the total number of all record and how can I get all the “client” IP in a one column?
What is the syntax for the MongoDB serverstatus command?
The command has the following syntax: The value (i.e. 1 above) does not affect the operation of the command. The db.serverStatus () command returns a large amount of data. To return a specific object or field from the output append the object or field name to the command.
What makes MongoDB different from other relational databases?
Unlike relational databases such as MySQL or PostgreSQL, MongoDB uses JSON-like documents for storing data. MongoDB is free, open-source, and incredibly performant. However, just as with any other database, certain issues can cost MongoDB its edge and drag it down.
How to return a large amount of data in MongoDB?
The db.serverStatus () command returns a large amount of data. To return a specific object or field from the output append the object or field name to the command.