Db May 2026

MongoDB (Document), Cassandra (Wide-column), Redis (Key-value). C. Vector Databases

When working with RDBMS, knowing key SQL commands is essential. These "keywords" are reserved words used to perform specific actions on the database. Retrieves data from a database. INSERT INTO: Adds new data. UPDATE: Modifies existing data. DELETE: Removes data. WHERE: Filters records. JOIN: Combines rows from two or more tables.

Indexes are vital for performance but can slow down write-heavy applications.

Creates an index to speed up data retrieval (crucial for performance). 4. Modern DB Architecture: Beyond Storage

Always use prepared statements to prevent SQL injection attacks. Conclusion