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What is working set in MongoDB?
Working Set is the amount of data(including indexes) that will be in used by your application and if this data fits in RAM then the application performance will be great else it would degrade drastically When the data can’t fit in RAM MongoDB has to hit disk which impacts performance.
What is a MongoDB asset?
Assets are defined as large immutable files such as images, music, videos, and/or documents. Currently, MongoDB Realm has a 4MB limit on the maximum object size supported — meaning that it really does not provide a solution for asset management (even if they are base 64 encoded).
How does MongoDB calculate working size?
If you are always accessing the last 12 month’s worth of data, then your working set is: 12GB (data) + 12GB (indexes) = 24GB. However, if you actually only access the last 3 month’s worth of data, then your working set is: 3GB (data) + 3GB (indexes) = 6GB.
Why is it not recommended to limit MongoDB memory usage?
It simply memory maps all its data files and relies on the operating system to cache data. The OS typically evicts the least-recently-used data from RAM when it runs low on memory. So in a production environment it is not recommended to restrict MongoDB memory usage as this might impact the performance and functionalities.
Where do I find cached memory in MongoDB?
The Operating System (the virtual memory manager specifically, depending on OS) manages the memory where the “Memory Mapped Files” reside. This number is usually shown in a program like “free -lmt”. It is called “cached” memory.
What are virt and Res in MongoDB?
VIRT and RES are virtual and resident memory. Below you see that mongod is using 91% of the system’s memory in this example. At that point the system became unresponsive. You can also get memory usage statistics from MongoDB in the shell: If you have even done C or C++ programming you will be familiar with malloc .
How can I shrink the size of my MongoDB database?
You can use below command to start the repair the database which will ultimately shrink the size of the database. MongoDB compresses the files by: You can compress by running mongod –repair or by connecting directly and running db.repairDatabase () like below.