• Introduction
    • Databases store and manage data in systems
    • 75% of databases will migrate to cloud by end of 2023
    • SQL language used to retrieve data from databases
    Relational Databases
    • Oracle 19C supports JSON and automatic indexing
    • MySQL released in 1995, supports multiple operating systems
    • Microsoft SQL Server released in 1989, supports multiple languages
    • PostgreSQL supports both relational SQL and JSON queries
    NoSQL Databases
    • MongoDB introduced in 2007, provides JSON-like storage
    • Redis is in-memory database supporting multiple programming languages
    • ElasticSearch offers flexible schema for document-oriented search
    • CouchDB uses JavaScript query language with map reduce optimization
    Cloud Databases
    • Microsoft Azure used by 70% of companies
    • SAP HANA stores data in memory for faster retrieval
    • DynamoDB developed by Amazon in 2012, written in Java
    • TeamDesk offers web-based database platform with unlimited storage

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