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Databases Intermediate

What is NoSQL?

A category of databases that store data in non-tabular formats, optimized for specific data models and access patterns.

NoSQL databases sacrifice some relational features for scalability and flexibility. Types include document stores (MongoDB — JSON documents), key-value stores (Redis — simple lookups), column-family stores (Cassandra — wide columns), and graph databases (Neo4j — relationships).

NoSQL databases often provide eventual consistency rather than strong consistency, horizontal scaling, and schema flexibility. They excel at specific use cases like caching, real-time analytics, and content management.

Related Terms

Row-Level Security (RLS)
A database feature that restricts which rows a user can access in a table based on security policies.
B-Tree Index
The default index type in most databases that organizes data in a balanced tree structure for efficient searching, sorting, and range queries.
Normalization
The process of organizing database tables to reduce data redundancy and improve data integrity.
Write-Ahead Log (WAL)
A technique where changes are first written to a log before being applied to the database, ensuring crash recovery and data integrity.
Connection String
A formatted string containing all parameters needed to establish a connection to a database server.
MVCC (Multi-Version Concurrency Control)
A technique where the database maintains multiple versions of data to allow concurrent reads and writes without locking.
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