What is a Key-Value Database?

By on

Key-Value DatabaseKey-Value Databases, also called Key-Value Stores, are often considered the simplest type of NoSQL databases. Each unique identifier is stored as a key with its associated value. The value can be any sort of byte array, data structure, or binary large object (BLOB), and works well for storing enormous amounts of data. Windows Explorer and Apple Finder are both Key-Value Databases.

Good Key-Value Database Use Cases Include:

  • Scalable data
  • Profiles, preferences and configurations
  • Cache management
  • Blockchain implementation
  • Multimedia storage or large objects (video, images, audio, etc.)

Key-Value stores are not considered suitable for applications requiring frequent updates or for complex queries involving specific data values, or multiple unique keys and relationships between them.

Other Definitions of Key-Value Store Include:

  • A database implementing a hash table to store unique keys along with the pointers to the corresponding data values.
  • “An in-memory data store used as a database, cache and message broker.” (Redis)
  • The most flexible type of NoSQL database and an alternative to traditional relational databases.
  • “Collection of paired identifiers, called ‘keys,’ and facts, called ‘values'”. (Meta S Brown, Forbes).
  • “Databases that store key and value data in lookup.” (Rick Murphy, IBM).
  • Database that stores data in only two columns (“key” and “value”), including simple (dates, numbers, codes) and complex information (unformatted text, video, music, documents, photos) within the key and value columns respectively.

Image Credit: Akshay Pore

Businesses Use Key-Value Databases to Handle:

  • Simple schema
  • High velocity read/write without frequent updates
  • High performance and scalability

Photo Credit: DStarky/Shutterstock.com

We use technologies such as cookies to understand how you use our site and to provide a better user experience. This includes personalizing content, using analytics and improving site operations. We may share your information about your use of our site with third parties in accordance with our Privacy Policy. You can change your cookie settings as described here at any time, but parts of our site may not function correctly without them. By continuing to use our site, you agree that we can save cookies on your device, unless you have disabled cookies.
I Accept