Python and MongoDB: Connecting to NoSQL Databases

A core function of MongoDB is its horizontal scalability, which makes it a useful database for companies running big data applications. In addition, sharding lets the database distribute data across a cluster of machines. MongoDB also supports the creation of zones of data based on a shard key. Document databases are highly flexible, allowing variations in the structure of documents and storing documents that are partially complete. Fields in a document play the role of columns in a SQL database, and like columns, they can beindexedto increase search performance. If you are developing using modern agile methodologies, a relational database will slow you down.

Why Use MongoDB And When To Use It

In a SQL-based table, the columns in a table store discrete data items. Ancillary relationships are defined through foreign keys and joins with another table. MongoDB is much more flexible because it allows each document to maintain a different hierarchy and does not require foreign or compound keys. Embedded documents take the place of joins in a relational database. However, it is much more likely for MongoDB data to be duplicated in different embedded documents compared with RDBMS tables.

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Also, it makes complete sense as the database is backed and powered by Google. But on the flip side, it does not have enough support for iOS. Limited hosting options – Firebase is cloud-based, meaning your only hosting option is Google Cloud. With open-source alternatives, you have more options for hosting, either on some other cloud solution or even a local server.

Why Use MongoDB And When To Use It

If you would rather imagine your data as a bunch of interconnected tables, MongoDB may not be a good choice. If you can represent your data in a form of a bunch of documents, MongoDB could be a good choice. Software Engineering Stack Exchange is a question and answer site for professionals, academics, and students working within the systems development life cycle. Reddit.Reddit is one of the largest social news platforms in the world, where registered users can post links to any information they like on the Internet.

Tutorial Series: How To Manage Data with MongoDB

Direction, another field in the executionStats section, indicates which direction MongoDB decided to traverse the index. Because the index was created as ascending, using the syntax, and the query requested mountain peaks sorted in descending order, the database engine decided to go backwards. This mechanism works well for many use cases, but it can become noticeably slow when the collection grows larger. All related content is stored in a single document, making it easy to add new features and attributes.

Why Use MongoDB And When To Use It

To perform a text search query, the collection must contain a text index. A collection can only have one text index, and a single text index can be applied to multiple fields. To save a document to your database, you need to call .save() on a document object. If the document already exists, then all the changes will be applied to the existing document. MongoDB is said to be a schemaless database, but that doesn’t mean it’s schema free. Having documents with a different schema within the same collection can lead to processing errors and inconsistent behavior.

Table of Contents

A database is any structured information or data specially organized and stored in a computer for fast retrieval and search. SQL databases are highly suitable for well-structured data where the entries contain the same fields. MongoDB and other NoSQL databases are better for unstructured or variable data. MongoDB used the single field index on the height field to narrow down the results from 5 to 3, but then had to scan the remaining documents to check the first winter ascent date. With that, you’ve learned how to create a unique index to prevent a given field from containing duplicate values.

  • Fields in a document play the role of columns in a SQL database, and like columns, they can beindexedto increase search performance.
  • A document’s structure is changed by adding or deleting new or existing fields.
  • We will end with some use cases for MongoDB and discuss common pitfalls when using this database technology.
  • It is free to use under the Server Side Public License .
  • It also lets you ensure your data is backed up and never lose it in case of cyber attacks or disasters.

MongoDB is great when you can represent your data as independent “packages” of information. You have google maps ZIP codes, embedded in the ZIP code are companies and inside the companies are employees. All the zip codes are independent from each other and you can get the whole information in a simple, pretty and fast way.

Understanding Indexes

Run the installer and follow the on-screen instructions on the installation wizard. This page also provides information on how to run MongoDB as a Windows service. Its purpose is to host blog articles, and for every article, store the different versions, some metadata, visit statistics, etc.

All these instances of MongoClient provide the same client setup to connect your current MongoDB instance. Which one you should use just depends on how explicit you want to be in your code. If you’re on Linux, then the installation process will depend on your specific distribution. For a detailed guide on how to install MongoDB on different Linux systems, go to the installation tutorial page and select the tutorial that matches your current operating system. Make sure you run the MongoDB daemon, mongod, at the end of the installation.

Essential Concepts of Big Data and Hadoop

Like other relational systems, MySQL stores data in tables and uses structured query language for database access. In MySQL, you pre-define your database schema based on your requirements and set up rules to govern the relationships between fields in your tables. Any changes in schema necessitates a migration procedure that can take the database offline or significantly reduce application performance. This allows users to save their data in a flexible and freeform manner. Users can define their own database schema to align with their internal data and programming structures.


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Developed in 2007, MongoDB is a popular NoSQL, non-relational database management system that uses documents instead of tables or rows for data storage. This data model makes it possible to manipulate related data in a single database operation. Developers can rework document structures as their application requirements change over time. With this approach, data structures become like code — both are under developers’ control. MongoDB is a general-purpose database that can provide many benefits to your application development processes. It can help you build applications that are more future-proof with its scaling capabilities and flexible schema.

What is your primary use case for MongoDB?

Proper load balancing is fundamental to database management for expansion in large-scale organizations. As client traffic and requests come in thousands and millions, they must be well distributed across the different servers to maximize performance and reduce over congestion. MongoDB efficiently handles what is MongoDB read and write requests, balancing the incoming load across its multiple servers and ensuring data consistency. This means that with MongoDB, there is no need for additional load balancers. Within the collections are documents analogous to rows in a table in the relational database system.