6 Database Types You Must Know 1. Relational Database 💼   - Data Model: Organizes data into tables with rows and columns.   - Examples: MySQL, PostgreSQL, Oracle, SQL Server.   - Key Features: ACID compliance, strong data consistency, structured data storage, support for SQL queries, well-suited for complex transactions and reporting. 2. Document Database 📄   - Data Model: Stores data in semi-structured or JSON-like documents.   - Examples: MongoDB, CouchDB, Firebase Firestore.   - Key Features: Flexible schema, horizontal scalability, support for semi-structured data, well-suited for content management systems and real-time applications. 3. In-Memory Database 🚀   - Data Model: Stores data entirely in the system's main memory (RAM).   - Examples: Redis, Memcached, Apache Ignite.   - Key Features: Ultra-fast data retrieval, low-latency, suitable for caching, session management, and real-time analytics. 4. Graph Database 🌐   - Data Model: Represents data as nodes and edges to model relationships.   - Examples: Neo4j, Amazon Neptune, ArangoDB.   - Key Features: Efficient querying of complex relationships, graph traversal, suitable for social networks, recommendation systems, and fraud detection. 5. Time-Series Database 📈   - Data Model: Optimized for time-ordered data points, like sensor readings or log files.   - Examples: InfluxDB, Prometheus, TimescaleDB.   - Key Features: Efficient storage and retrieval of time-series data, aggregations, retention policies, ideal for monitoring, IoT, and event data. 6. Spatial Database 🌍   - Data Model: Designed for storing and querying spatial or geographic data.   - Examples: PostGIS (extension for PostgreSQL), MongoDB Geospatial, Microsoft SQL Server Spatial.   - Key Features: Geospatial indexing, support for spatial data types (points, polygons, lines), useful for location-based services, GIS (Geographic Information Systems), and map applications. So which one are you using? Comment bellow. ▷ 👍🏿 Subscribe to our newsletter - bit.ly/45ucZPf #systemdesign #coding #interviewtips

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