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MySQL vs. MongoDB: Difference Between SQL & MongoDB
Updated on 03 July, 2023
5.74K+ views
• 11 min read
Table of Contents
Today, we generate unprecedented volumes of data, precisely over 2.5 quintillion bytes of data every day! With each passing day, this number is only going to increase. However, the data we produce is generally raw and unstructured – it is a compilation of unorganized, random facts that lack coherence and meaning. Thus, it is essential to clean, organize, process, analyze, and contextualize the data to convert into meaningful information. This is where databases and database management systems (DBMS) enter the picture.
There are primarily two types of databases that act as a base for the many different databases we have now. They are SQL and NoSQL. Both of them are opposite binaries. Primarily, SQL served as the foundation for relational databases. Although SQL dominated the database domain for a very long time, the steady upsurge in data over the years created a need for a DBMS that can scale exponentially. This need resulted in the birth of the NoSQL database.
Following the Internet boom in the mid-90s, relational databases could not handle the sudden increase in the influx and generation of different data types by users around the globe. Thus, NoSQL (non-relational database) was developed to replace SQL’s organized storage with flexibility.
Today’s post is all about looking at relational and non-relational databases, with a particular focus on the difference between SQL and MongoDB.
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SQL vs. NoSQL: A detailed discussion
SQL (Structured Query Language) was developed back in the 1970s for accessing and manipulating relational databases. SQL commands are used to perform a host of functions on databases, such as updating data or retrieving the data stored in a database. The main focus of creating SQL databases was to avoid data duplication to reduce storage costs. Usually, SQL databases feature a set and complex tabular schemas. They require vertical scaling (migrating data to larger servers), which is quite expensive.
Oracle, MySQL, PostgreSQL, and Microsoft SQL Server are some of the most popular SQL databases.
Read: SQL Vs MySQL: Difference Between SQL and MySQL
Advantages of SQL
- Efficient data retrieval – SQL allows you to retrieve large volumes of data quickly. You can also perform operations like insertion, deletion, selection, etc. to cater to your database needs in real-time.
- Easy learning curve – You need not be an expert coder to use SQL. There’s no need to write long lines of code for SQL operations. You can use standard SQL commands like “Select”, “Insert”, “Update”, “Delete”, “Create”, and “Drop” to perform specific operations on a database..
- Standardized language – The American National Standards Institute (ANSI) declared SQL as the standard language for relational database management systems (RDBMS). Thanks to extensive documentation and upgrades over the years, SQL offers a consistent experience to all users.
- Platform compatible – SQL is compatible with all the major operating platforms, including Windows, Linux, macOS, and Unix systems. You can use SQL to write code for PCs, laptops, and servers, totally independent of any OS. Moreover, you can also integrate SQL commands with other applications.
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NoSQL databases came into the mainstream picture in the early 2000s. They were designed for flexibility, scalability, and high-speed querying. The unique aspect of NoSQL is that it allows for frequent application updates powered by agile and DevOps best practices. Unlike SQL databases, NoSQL databases can scale horizontally across commodity servers, making it both time and cost-efficient.
The most widely used NoSQL databases are MongoDB, CouchDB, DynamoDB, Cassandra, HBase, and Amazon Neptune.
Advantages of NoSQL
- Fast query processing – Typically, NoSQL databases allow for rapid query processing than SQL databases. This is because, in a NoSQL database, data is stored in a manner that optimizes it for query execution. Contrary to this, in SQL databases, the data is normalized. For accessing the data, you need to merge data from multiple tables. This process is called “join.” Thus, all queries for a single object demands that you combine data from various tables. When the tables grow in size, joining the data becomes very expensive. In NoSQL databases, data is that is accessed together is always stored together, thereby eliminating the need for joins.
- Easy mapping – Typically, NoSQL databases like MongoDB map their data structures to that of popular programming languages like Python, Java, R, etc. Hence, programmers can store the data in the way they use it in application code. This mapping reduces the development time and eliminates bugs.
- Flexible schemas – NoSQL databases boast of flexible schemas that allow developers to make changes to a database as and when needed. These schemas enable quick iteration and continuous integration of new features into an application.
- Horizontal scaling – NoSQL databases let you scale-out horizontally, meaning when the current server’s capacity requirements exceed, you can add cheaper, commodity servers as required.
Read: SQL Interview Questions
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MongoDB vs. MySQL
MongoDB and MySQL lie at the two extremes of the database domain. While MongoDB is a NoSQL database that is primarily concerned with handling raw and unstructured data, MySQL is an SQL database designed for handling organized, structured data.
What is MongoDB?
The main difference between MySQL vs MongoDB is that MongoDB is a NoSQL, founded in 2007 to allow efficient storage of large amounts of data, which were important for scalable use cases, in the form of documents – an important aspect of its design. The term ‘mongo’ comes from the word ‘humongous’, referring to the amount of data a business can store.
With the expansion of digital services, the volume of data required to sustain growth has become increasingly significant, leading to a demand for more adaptable database management and capabilities. MongoDB was created to meet this need for agile, data-rich database performance.
Content-serving and e-commerce sites usually employ MongoDB to take advantage of its scalability and flexibility. Businesses employ MongoDB as a high-performance database solution to rapidly update data in terms of structure and content.
Advantages of MongoDB
Some advantages of MongoDB over MySQL include the dynamic schema design, which enables a more adaptable environment for data search, integration, coding and database development. MongoDB also allows for easy modification of fields, thereby avoiding the need for a complete overhaul or recalibration of the database when organizational or data needs change.
Moreover, businesses can benefit from the document data model, a more advanced method of accessing, storing, insuring and merging any data type using code-friendly and native data models. This approach provides greater durability and easier scalability without needing conversion mapping. It results in a more sophisticated data management experience.
What are the main differences between MySQL and MongoDB?
MySQL is an RDBMS hosted, managed, and offered by the Oracle Corporation. It uses SQL for communicating with the database and accessing stored data. Like all relational databases, MySQL stores data in tables, within columns and rows. In MySQL, the database schema needs to be pre-defined. One also has to set the rules determining the relationship between fields in the tables within a database.
MongoDB is a NoSQL database wherein data is stored in the form of JSON documents. It uses MongoDB Query Language (MQL) to access data. All the documents that hold related information are stacked together in MongoDB. You need not declare the structure of documents to the database system since they are self-describing. The fields usually vary from document to document.
Now, let’s focus on the other aspects of the difference between MongoDB vs. MySQL.
Data storage
MySQL stores data in a tabular format. The tables contain columns that represent the attribute, and rows denote specific records. On the other hand, MongoDB stores data in collections that are similar to tables. However, these collections consist of multiple documents in JSON format having key-value.
In MySQL, different tables relate to each other via primary keys or foreign keys. For instance, in a database containing employee records, the EmployeeID column is the “Employee” table’s primary key. However, it will function as the foreign key in the “Payments” table. This defined relational rule ensures that the Employee table does not contain any entry regarding payments. Hence the name relational database.
In MongoDB, there’s no need to build such a relationship between the unstructured data contained in the collections. This is what makes it a non-relational database.
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Architecture
Like any SQL database, MySQL follows the ACID (Atomicity, Consistency, Isolation, and Durability) theorem. All four properties ensure that transactions occur consistently and reliably in the database.
On the contrary, MongoDB is governed by the principles of the CAP (Consistency, Availability, and Partition) theorem. The CAP approach focuses more on the availability of data in the database.
Thus, while MySQL ensures secure and reliable transactions, MongoDB assures high availability of data.
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Scalability
As we mentioned earlier, SQL databases can scale only vertically. This means, to scale MySQL, you need to increase the memory size, disk space, and computing power of the server. As the database’s size increases, high query volume, and vertical scaling can lead to increased costs.
Unlike MySQL, MongoDB supports horizontal scaling, wherein instead of increasing the memory size or computation power of the server, you can add a new server for scalability. This is less expensive since incorporating a cluster of low-cost commodity hardware is a cost-effective option to support high query volumes.
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Schema
MySQL has a pre-defined schema that dictates data compliance. You need to define the number of columns in a table and its data type while creating the table. Any data that you wish to store in the table must match the defined structure, failing which, it shows an error.
MongoDB does not require you to pre-define schemas. You can store varied data types in a collection without any hassle. This feature is extremely useful in the present scenario since most of the data generated today is unstructured and cannot be saved in SQL databases.
Query
In MySQL, you can write queries using SQL. The biggest advantage of SQL queries is that they are user-friendly. Like most other relational databases, MySQL also follows ANSI SQL standards. You can use SQL queries to perform advanced analytics operations, including joins, merge, and data aggregation. Thus, SQL is an excellent analytics tool.
Although MongoDB lacks the support for traditional SQL-like queries, it does support document querying. However, this being a developing feature has many limitations. For instance, unlike MySQL, MongoDB does not support joins, which is pivotal for collecting data from disparate sources.
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Similarities between MySQL and MongoDB
While discussing the differences, we also need to acknowledge the range of similarities between the two. The primary similarity is that they are both database management systems, essentially information networks for digital spaces and websites. They build the foundation of web applications by storing data on a computer system.
Both MongoDB and MySQL can support Java, Python, Server-side PHP and Node.js languages via drivers or interfaces. These database management systems allow companies to alter, distribute or deploy cloud-native applications.
MongoDB and MySQL were originally both developed as open-source databases, allowing anyone to freely use and distribute the code.
However, the main MongoDB and MySQL difference emerges in how each is designed.
What to Choose?
Choosing MySQL or MongoDB depends on the nature of the data and the application’s exact requirements.
A relational database, such as MySQL, is better suited for applications requiring multi-row transactions and structured data. That makes it an excellent choice for traditional relational databases.
On the other hand, MongoDB is well-suited for applications involving real-time analytics, the Internet of Things, content management, and other applications. It is ideal for handling unstructured/structured data with fast growth potential.
Wrapping up
There’s no clear winner in the MongoDB vs. MySQL debate. Each database boasts of unique features and advantages, while also having certain limitations. The choice between MongoDB and MySQL essentially depends on your data storage needs and scalability requirements.
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Frequently Asked Questions (FAQs)
1. When should you use MongoDB or any other NoSQL database?
You should use MongoDB when you are building business applications on the internet. It helps in scaling and quick updates. It also helps in creating scalable projects using agile methodologies and supports applications that require rapid development iteratively. It assists in scaling the project and meeting high levels of read and write traffic on the application. MongoDB helps with horizontal scaling by distributing data across several systems, sharding, and carrying out high throughput operations using large data sets. The data repository can scale to a much larger size and the application can quickly evolve the deployment process with the business changes.
2. What are the types of relationships in MySQL?
A database relationship tells how data in one relation is related to data in another relation. A key in a relation will normally relate to a key in another relation. Two relations in a database can also be unrelated. There are three types of MySQL relationships: One-to-One (1:1), One-to-Many (1:N), Many-to-Many (M:N). If only one attribute of a table is related to one attribute of another table, it is called 1:1 relationship. If one attribute of a table is related to multiple attributes of another table, it is called 1:N relationship. If multiple attributes are related to multiple attributes of another table, it is called M:N relationship.
3. What are the advantages of using MySQL?
MySQL is a database management service application for web servers. Its flexibility, power, indexing, searching, etc. It can grow with the business changes as it is highly scalable. It can run on all operating systems, which makes it very flexible. It provides high-performance and enterprise-level SQL features. It provides features like views, subqueries, and stored procedures. It offers full-text indexing and searching. It has query caching that enhances its speed. It can create a replication of an SQL server on different systems which helps to collaborate on a project. It also provides configuration and security features for the database.
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