MongoDB is a popular NoSQL database. Unlike relational database management systems like MySQL, MongoDB doesn’t group data into rows and columns. Instead, it uses JSON-like documents to store data. This makes it possible for MongoDB to store different types of data, even those that can’t fit in relations. MongoDB also scales well and offers a high performance to its users. That’s why it is one of the most preferred NoSQL database management systems by application developers.
However, just like other database management systems, a number of issues may occur and downgrade the performance of MongoDB. This may have a negative effect on the performance of your application. That’s why you should learn how to fine-tune your MongoDB Configuration to get the best performance.
In this article, you will learn how to check the MongoDB configuration settings and apply the best practices that can help you to optimize your files and services.
Table of Contents
What is MongoDB?
MongoDB is a popular free and open-source cross-platform document-oriented database built for efficiently storing and processing massive volumes of data. Unlike traditional relational databases, MongoDB is classified as a NoSQL Database Management System that uses Collections and JSON-like Documents instead of tables consisting of rows and columns. Each collection consists of multiple documents that contain the basic units of data in terms of key and value pairs.
Officially introduced as an open-source development model in 2009, the MongoDB database is designed, maintained, and managed by MongoDB.Inc under a combination of the Server Side Public License and the Apache License. MongoDB is widely used by organizations such as MetLife, Barclays, Viacom, New York Times, Facebook, Nokia, eBay, Adobe, Google, etc to efficiently meet their exponentially growing data processing and storage requirements. MongoDB is highly flexible as it supports several programming languages such as C, C++, C#, Go, Java, Node.js, Perl, PHP, Python, Motor, Ruby, Scala, Swift, and Mongoid.
Key Features of MongoDB
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With constant efforts from the online community, MongoDB has evolved over the years. Some of its eye-catching features are:
- High Data Availability & Stability: MongoDB’s Replication feature provides multiple servers for disaster recovery and backup. Since several servers store the same data or shards of data, MongoDB provides greater data availability & stability. This ensures all-time data access and security in case of server crashes, service interruptions, or even good old hardware failure.
- Accelerated Analytics: You may need to consider thousands to millions of variables while running Ad-hoc queries. MongoDB indexes BSON documents and utilizes the MongoDB Query Language (MQL) that allows you to update Ad-hoc queries in real-time. MongoDB provides complete support for field queries, range queries, and regular expression searches along with user-defined functions.
- Indexing: With a wide range of indices and features with language-specific sort orders that support complex access patterns to datasets, MongoDB provides optimal performance for every query. For the real-time ever-evolving query patterns and application requirements, MongoDB also provisions On-demand Indices Creation.
- Horizontal Scalability: With the help of Sharding, MongoDB provides horizontal scalability by distributing data on multiple servers using the Shard Key. Each shard in every MongoDB Cluster stores parts of the data, thereby acting as a separate database. This collection of comprehensive databases allows efficient handling of growing volumes of data with zero downtime. The complete Sharding Ecosystem is maintained and managed by Mongos that directs queries to the correct shard based on the Shard Key.
- Load Balancing: Real-time Replication and Sharding contribute towards large-scale Load Balancing. Ensuring top-notch Concurrency Controls and Locking Protocols, MongoDB can effectively handle multiple concurrent read and write requests for the same data.
- Aggregation: Similar to the SQL Group By clause, MongoDB can easily batch process data and present a single result even after executing several other operations on the group data. MongoDB’s Aggregation framework consists of 3 types of aggregations i.e. Aggregation Pipeline, Map-Reduce Function, and Single-Purpose Aggregation methods.
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How to Optimize MongoDB Configuration?
MongoDB provides the following settings to set up your MongoDB Configuration for optimal performance:
1. MongoDB Configuration: Locking Performance
This is an important part of MongoDB configuration. Database receives multiple reads, writes, and updates from different users. These operations are not done sequentially, and one user may access data that another user is in the middle of updating. This can lead to conflicts. To solve such issues, databases introduced the concept of locks for locking documents and collections.
When a lock is initiated, no other user can read or modify the data until the lock is released. Although this feature is good for avoiding conflicts, it can degrade the database performance.
The good news is that MongoDB comes with useful metrics that can help you to check whether locking is degrading your database performance. The two common ones are globalLock and locks of the db.serverStatus() command:
- db.serverStatus().globalLock
Image Source: Self
Image Source: Self
If the value of the currentQueue parameter is too high, it could be an indication of concurrency. If the value of totalTime parameter is higher than the total database uptime, it means that the database has been in a lock state for a long time.
With these two parameters alone, you can investigate the request that has created a lock and take the necessary action to improve the performance of MongoDB.
2. MongoDB Configuration: WiredTiger Cache
MongoDB’s MMAPv1 storage is deprecated, and there are plans to remove it in future releases. Thus, it is advisable to move any MMAPv1 storage engine to the modern WiredTiger storage engine. The latter is better when it comes to concurrency handling and performance. It also offers encryption and compression.
By default, MongoDB reserves 50% of memory for WiredTiger data cache. The cache size is important in ensuring that WiredTiger performs well. As part of the MongoDB configuration, you should check to see if there is a need to alter its default size. The cache size should be big enough to hold the whole application’s working set.
Run the following command to check the cache usage statistics:
db.serverStatus().wiredTiger.cache
The command will return so much data, but you can focus on a few fields including:
- wiredTiger.cache.maximum bytes configured: The maximum size of the cache.
- wiredTiger.cache.bytes currently in the cache: The size of the data currently stored in the cache. It should be less than the size of the above parameter.
- wiredTiger.cache.tracked dirty bytes in the cache: The size of the dirty data stored in the cache. Its value should be less than that of bytes currently in the cache.
The sizes of the above parameters should tell you whether you should increase the size of the cache or not. For read-heavy applications, you can consider the wiredTiger.cache.bytes read into cache parameter. If it has a high value, increasing the size of the cache may improve the read performance.
3. MongoDB Configuration: MongoDB Logging
The location of the MongoDB log is defined in the logpath setting, and it is always /var/log/mongodb/mongod.log. The MongoDB configuration file can be found at /etc/mongod.conf.
The following query can help you to change the log verbosity of a component:
db.setLogLevel(2, "query")
The log file is significant and you may need to clear it before doing profiling. You only have to run the following command:
db.runCommand({ logRotate : 1 });
4. MongoDB Configuration: Free Performance Monitoring
MongoDB has introduced a free performance monitoring feature for replica sets and standalone instances in the cloud. When you enable this feature during MongoDB configuration, the monitored data will be sent to the cloud service periodically. You don’t need any additional agents to use this feature.
The configuration process only takes a single command, after which you will be given a web address where you can access the performance stats. To enable free monitoring during runtime, run the following command:
db.enableFreeMonitoring()
Image Source: Self
Just copy the URL provided in the output and paste it on your web browser. You will be able to monitor performance statistics after a single MongoDB configuration command.
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The dashboard will show you metrics such as operation execution time, disk utilization, memory, system CPU usage, query targeting, and more.
You can disable this feature via this command:
db.disableFreeMonitoring()
You can also enable and disable the feature during MongoDB startup. You can use the —enableFreeMonitoring command-line option or cloud.monitoring.free.state configuration file setting for this. These are some of the important features to consider during MongoDB configuration.
Conclusion
In this article, you have learned about some of the important MongoDB Configuration settings that you can fine-tune for optimal performance. MongoDB is a popular NoSQL database management system. It scales well and offers a high performance to its users. However, just like with other database management systems, issues may arise when using MongoDB, and these can downgrade its performance. Thus, you should learn how to do MongoDB configuration for various metrics to fine-tune its performance.
To avoid conflicts, MongoDB uses the concept of locks. MongoDB comes with metrics that you can use to check whether locking is downgrading your database performance. You should also check to see if there is a need to alter the size of memory allocated to the WiredTiger data cache. To monitor the performance statistics of MongoDB on the web browser, you can enable its free performance monitoring feature. This feature can be enabled during startup or during runtime.
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Tell us about your experience of learning about the optimal MongoDB Configuration settings! Share your thoughts with us in the comments section below.
Nicholas Samuel is a technical writing specialist with a passion for data, having more than 14+ years of experience in the field. With his skills in data analysis, data visualization, and business intelligence, he has delivered over 200 blogs. In his early years as a systems software developer at Airtel Kenya, he developed applications, using Java, Android platform, and web applications with PHP. He also performed Oracle database backups, recovery operations, and performance tuning. Nicholas was also involved in projects that demanded in-depth knowledge of Unix system administration, specifically with HP-UX servers. Through his writing, he intends to share the hands-on experience he gained to make the lives of data practitioners better.
