MongoDB vs SQL: Main Differences, Benefits, and Disadvantages

Mongodb vs SQL comparison

Choosing the right database management system is a critical decision for developers as it impacts the overall performance and flexibility of their applications. With MongoDB and SQL being popular choices, it can be challenging to determine the most suitable option for a project. 

To help you better grasp the differences, benefits, and disadvantages of MongoDB vs SQL, this article will provide a comprehensive comparison of both servers. Whether you’re looking for a highly flexible NoSQL database or a more traditional relational database, each option has its strengths and weaknesses. 

So, let’s dig in to explore more!

What Is MongoDB?

As an open-source NoSQL database, MongoDB employs a document-oriented data model. Instead of using tables and rows like traditional relational databases, it stores data in flexible, JSON-like documents called BSON. This structure enables seamless integration of data types and provides better performance, scalability, and flexibility for modern applications.

Key Features, Benefits, and Disadvantages of MongoDB

Key Features

  1. Document-oriented: MongoDB stores data in flexible, JSON-like BSON documents, making it easy to work with diverse data types and structures.
  2. Indexing: Efficient indexing of fields within documents ensures fast query performance.
  3. Replication: MongoDB supports high availability through replica sets, which automatically maintain multiple copies of data.
  4. Sharding: Horizontal scaling is achieved by distributing data across multiple servers using sharding.
  5. Geospatial support: Built-in support for geospatial data types and queries makes it an excellent choice for location-based data storage and analysis.

Let’s now shift to a few pros and cons of MongoDB worth considering:


  • Flexibility: MongoDB’s schema-less data model allows for easy adaptation as application requirements change, without the need for costly schema migrations.
  • Scalability: Horizontal scaling through sharding enables the handling of growing data sets and increased user traffic without impacting performance.
  • Rich query language: A powerful query language supports complicated queries and aggregations, reducing the need for external processing.
  • Integration with big data tools: MongoDB’s flexible data model and support for multiple data formats make it easy to integrate with big data and analytics tools such as Hadoop and Spark.
  • Strong community and ecosystem: MongoDB has a large, active community providing resources, support, and third-party tools for developers. MongoDB, Inc. also offers commercial support and services to help organizations succeed in their projects.


  • Limited transaction support: Although multi-document transactions were introduced in MongoDB 4.0, they have limitations compared to traditional relational databases.
  • No standard SQL-style joins: Working with related data across multiple collections can be challenging due to the lack of support for standard joins.
  • Higher storage and memory usage: The flexible data model can consume more storage space, and caching and indexing may lead to increased resource usage.
  • Complex sharded cluster management: Managing and maintaining sharded clusters can be complex, especially in large-scale deployments, requiring additional expertise and resources.
  • Less mature ecosystem: MongoDB’s ecosystem may not be as mature or extensive as those of more established relational databases, potentially leading to fewer experienced developers, tools, and support for some use cases.
MongoDB vs SQL database

Pro hint: WildLearner has a free course for everyone willing to dive deep into the world of MongoDB. With no prerequisites required, this course is ideal for beginners looking to gain a comprehensive understanding of MongoDB. 

Composed of 5 primary sections, the course offered by WildLearner covers a wide range of topics related to MongoDB. The five sections of the course include an introduction to MongoDB, creating, reading, updating, and deleting.
Designed to be self-paced, the course allows learners to complete it at their own convenience and receive a free certificate of completion upon finishing. 

What Is SQL?

Structured Query Language or SQL is a domain-specific language used for managing relational databases. It allows developers to define, manipulate, and query data stored in tables with predefined schemas. SQL is widely used in traditional relational databases like MySQL, PostgreSQL, and SQL Server, providing a standardized way to interact with data across various platforms.

Key Features, Benefits, and Disadvantages of SQL

Key Features

  1. Schema-based data model: SQL databases enforce a fixed schema for tables, ensuring consistent data types and relationships among them. This structure allows for efficient querying and data integrity.
  2. Support for complex transactions: SQL databases are designed for handling complex transactions, providing ACID (Atomicity, Consistency, Isolation, Durability) properties that ensure data integrity and reliability.
  3. Powerful query language: SQL’s query language supports complicated joins, aggregations, and subqueries, enabling developers to manipulate and retrieve data from multiple tables efficiently.
  4. Indexing: SQL databases offer various indexing options, including primary keys, unique keys, and foreign keys, which optimize query performance and ensure data consistency.
  5. Mature ecosystem: SQL databases have a long history and a mature ecosystem with extensive tools, libraries, and community support.


  • Data consistency: The schema-based approach ensures data consistency and integrity, reducing the risk of data corruption or loss.
  • Complex queries: SQL allows developers to perform complex queries and aggregations easily, retrieving data from multiple tables in a single query.
  • Transaction support: SQL databases provide robust support for transactions, ensuring data reliability and integrity.
  • Mature ecosystem: The mature ecosystem of SQL databases provides developers with a wealth of tools, libraries, and community support.


  • Limited scalability: SQL databases may struggle to scale horizontally, especially when compared to NoSQL databases like MongoDB. Scaling often requires manual efforts and can be resource-intensive.
  • Rigidity: The schema-based approach may hinder flexibility in evolving applications or handling diverse data types, requiring schema migrations that can be time-consuming and error-prone.
  • Less suitable for unstructured data: SQL databases are not designed to handle unstructured or semi-structured data efficiently, making them less suitable for certain use cases.

MongoDB vs SQL: Main Differences

Now, let’s see how the two differ based on the abovementioned key characteristics.

When comparing MongoDB vs SQL, there are several differences to consider. First, MongoDB is a document-oriented NoSQL database, while SQL databases, such as MySQL and PostgreSQL, are relational and use structured query language (SQL) for data manipulation. This fundamental difference in data organization affects several aspects of their functionality:

Data model

MongoDB’s flexible schema allows for diverse data types and structures within a single collection, whereas SQL databases require a predefined schema with tables and columns, making it less adaptable to changes in data requirements.

Query Language

MongoDB utilizes a rich, expressive query language based on JavaScript, allowing for tricky queries and aggregations. In contrast, SQL databases rely on the widely-used SQL language, which is more standardized and familiar to developers.


MongoDB excels in horizontal scaling, distributing data across multiple servers through sharding. This feature makes it ideal for handling large data sets and high-traffic applications. When comparing MongoDB vs SQL, it’s essential to note that SQL databases rely more on vertical scaling, which can be limited by hardware constraints.


While MongoDB introduced multi-document transactions in version 4.0, SQL databases have long-supported transactions, allowing for complicated, multi-step operations to be executed atomically and ensuring data consistency.

Indexing and Caching

MongoDB’s indexing capabilities are robust and can be used to optimize query performance. However, SQL databases offer more advanced indexing options, such as full-text search and spatial indexes, in addition to mature caching mechanisms.

Data Consistency

MongoDB follows the BASE (Basically Available, Soft state, Eventual consistency) model, prioritizing availability and partition tolerance over solid consistency. SQL databases adhere to the ACID (Atomicity, Consistency, Isolation, Durability) model, ensuring that data remains consistent across multiple operations.

These main differences between MongoDB and SQL databases impact their suitability for various use cases and should be carefully considered when choosing the right database for a particular application.

Guide to what is MongoDB

Why Use MongoDB Over SQL?

There are several reasons why developers might choose MongoDB over SQL databases, depending on their specific requirements and use cases. Considering the advantages of MongoDB vs SQL can help you better assess which database is more ideal for your project:

Schema Flexibility

MongoDB’s dynamic schema allows developers to store data with varying structures within the same collection, making it easier to accommodate changes in data requirements over time. In contrast, SQL databases need a predefined schema, which can be cumbersome to modify if the data structure changes.


As MongoDB is designed for horizontal scalability through sharding, it can handle large amounts of data and high-traffic applications efficiently. SQL databases, on the other hand, rely more on vertical scaling, which can be limited by hardware constraints.


MongoDB can deliver better performance for certain types of queries and workloads, particularly when dealing with large, unstructured data sets. The ability to store related data in a single document can reduce the need for complicated and time-consuming joins, which are common in SQL databases.


MongoDB’s query language, which is based on JavaScript, is often easier for developers to learn and use compared to SQL. Additionally, MongoDB’s document-based data model aligns well with object-oriented programming languages and JSON, simplifying data manipulation and mapping.

Cloud-Native Support

Initially built for the cloud era, MongoDB provides built-in support for cloud deployments, including multi-cloud and hybrid cloud configurations. This makes it more accessible for organizations to adopt modern cloud-based infrastructure, whereas SQL databases might require additional configuration and management.

While MongoDB offers several advantages over SQL databases, it is important to evaluate each database based on the specific needs of your application. MongoDB is well-suited for use cases that require flexibility, scalability, and the ability to handle unstructured data, while SQL databases might be more appropriate for applications that require strong consistency and support for complex transactions.

MongoDB vs SQL: Which Server Is Faster?

Comparing the speed of MongoDB vs SQL databases is not a simple task, as multiple factors can affect their performance, including the nature of the data being stored, the way queries are executed, and the hardware and infrastructure supporting the systems.

  1. Data structure: MongoDB’s document-based data model can lead to faster query times for certain types of data and workloads, especially when dealing with large, unstructured data sets. By storing related data in a single document, MongoDB can eliminate the need for complex and time-consuming joins, common in SQL databases.
  2. Indexing: Both MongoDB and SQL databases use indexes to optimize query performance. However, MongoDB supports a wider range of index types, including multi-key, geospatial, and text indexes, which can enable faster query execution for specific use cases.
  3. Caching: MongoDB utilizes an in-memory storage engine called WiredTiger, which caches frequently accessed data in memory to improve read and write performance. SQL databases also use caching mechanisms, but their effectiveness may vary depending on the specific database implementation.
  4. Scalability: MongoDB’s horizontal scaling through sharding can help maintain performance as data volumes and query loads increase. SQL databases typically rely on vertical scaling, which can be limited by hardware constraints and may lead to performance bottlenecks.

It is essential to note that the performance of MongoDB and SQL databases can vary significantly depending on the specific implementation, configuration, and use case. Conducting performance tests and benchmarks tailored to your application’s requirements can help identify the most suitable database for your needs.

Coding example on computer

How To Perform Analytics on MongoDB Data?

Performing analytics on MongoDB data can be achieved through several methods. Here, we will discuss five options that can help you gain insights from your data stored in MongoDB and evaluate the difference between MongoDB vs SQL.

Import MongoDB Data into SQL Data Warehouse

One way to perform analytics on MongoDB data is by importing it into a SQL data warehouse. This approach enables you to run SQL queries on the imported data for detailed analytics. To accomplish this, you can either write custom batch Extract, Transform, Load (ETL) processes or use third-party tools like Panoply or Xplenty for a more streamlined experience.

While this method can be effective for many companies, there are certain limitations to consider. Firstly, it introduces the overhead of building, maintaining, and managing a data warehouse, which can be costly and time-consuming. Additionally, ETL or ELT processes can contribute to increased expenses.

Another challenge arises when some of your MongoDB data doesn’t fit into a SQL schema. In such cases, valuable information may be discarded during the data import process. This can be particularly concerning if the lost data is crucial for analytics or decision-making. When examining MongoDB vs SQL for analytics, importing MongoDB data into a SQL data warehouse can be a powerful approach but comes with certain costs and limitations.

MongoDB BI Connectors

These offer an alternative solution for performing analytics on MongoDB data. Recognizing the need for analytics support, MongoDB introduced the BI Connector, which allows compatibility with popular business intelligence tools like Tableau, Cognos, and Qlik. The connector acts as an intermediate interface between BI tools and MongoDB, converting SQL queries into MongoDB queries and presenting the results in an SQL format.

Using the MongoDB BI Connector simplifies the process compared to other options, such as building a data warehouse or custom Python applications. It eliminates the need for additional overhead and is more cost-effective.

The SQL vs MongoDB debate is relevant when discussing the BI Connector, as joining data from MongoDB with data from other SQL databases like MySQL can be challenging. One solution is to import MongoDB data into a MySQL database, but this reintroduces the overhead and complexities associated with data warehousing. In sum, the MongoDB BI Connector is a practical option for connecting existing BI tools to MongoDB, but it may fall short when attempting to join data from multiple heterogeneous sources.

Data Virtualization with Knowi

Data virtualization is a powerful approach that enables an application to access and present data from multiple sources while abstracting underlying technicalities. Users can enjoy a consistent view of data from various sources and a seamless experience. Knowi, a data virtualization platform, connects to MongoDB natively, providing users with the experience of running SQL queries on MongoDB data as if working with an SQL database.

Knowi’s ability to join data from multiple heterogeneous sources is another advantage. For instance, joining MongoDB data with MySQL data can be achieved by simply providing the two sources and the joining field. Additionally, Knowi supports native MongoDB queries.

When considering whether to use SQL or MongoDB for analytics, data virtualization with Knowi is the best choice for those seeking a lightweight and seamless experience. It’s an ideal solution for managing multiple data sources, performing cross-database joins, or maintaining a flexible data infrastructure as your organization scales.

Custom coding with Python and PyMongo

For those with a penchant for Python, another option for performing analytics on MongoDB data is to build a custom Python application using PyMongo, a MongoDB driver for Python. With PyMongo, users can not only fetch data from MongoDB but also write data back into it, enabling flexible data manipulation and analysis.

Developing a custom Python application can be a suitable alternative to data warehousing, particularly for exploratory data analysis. However, it may not always be the proper fit for commercial applications, as it can require substantial development and maintenance efforts.

While custom coding with Python and PyMongo offers a lightweight and flexible solution for exploratory data analysis, it may not be the most optimal choice for all situations. For more comprehensive and scalable analytics, considering data warehousing or a BI solution might be a better option. The question of why use MongoDB over SQL often arises when evaluating database options, and the answer lies in the specific use case, data types, and analysis requirements.


Last but not least, translation is another method to perform analytics on MongoDB data by converting SQL queries into MongoDB queries. This approach is similar to what the MongoDB BI Connector does but relies on third-party implementations. For instance, the team at Dremio has developed a translation engine to tackle this issue. Translation systems interpret SQL queries, reformat them into NoSQL queries, and then execute them on MongoDB. One of the advantages of MongoDB over SQL is its ability to store schema-less data, which can be beneficial for organizations dealing with diverse and rapidly changing data sources.

This option is suitable for simple use cases, providing a flexible and straightforward solution for analytics on MongoDB data. By using translation, users can leverage their existing SQL skills to analyze NoSQL data, making the transition to MongoDB smoother. It’s also an excellent choice for users primarily focusing on SQL-based analytics who want to explore MongoDB’s capabilities without investing in additional tools or services.

As the demand for analytics on MongoDB data grows, translation systems will continue to evolve and improve, making it an increasingly viable option for various use cases. By understanding the differences and advantages of MongoDB, you can better determine whether to opt for SQL or MongoDB in your analytics projects.

SQL or MongoDB: Key Findings

In today’s data-driven world, it’s crucial for developers to have a flexible and scalable database for managing vast amounts of data. When considering the difference between MongoDB and SQL, MongoDB offers flexibility, scalability, and the ability to store unstructured data, while SQL provides a more structured approach. However, performing advanced analytics can be challenging without the right tools or methods, regardless of the database chosen. 

To help you master MongoDB, WildLearner offers a certified online course designed to provide in-depth knowledge and practical skills. Don’t miss out on this opportunity, and sign up for their free trial today!