Databases Beginner

What is Database Backup?

The process of creating copies of database data to protect against data loss from failures, corruption, or human error.

Backup strategies include logical backups (pg_dump — SQL statements to recreate data), physical backups (file-level copies of data directory), and continuous archiving (WAL shipping for point-in-time recovery).

The 3-2-1 rule: 3 copies of data, on 2 different media types, with 1 offsite copy. Test restores regularly — an untested backup is not a backup. Automate backups with cron and monitor for failures. Cloud providers offer managed backup solutions.

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A technique for searching natural language text in databases using word stemming, ranking, and relevance scoring.

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A cache of database connections that can be reused, avoiding the overhead of creating new connections for each request.

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

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An open-source, in-memory data store used as a database, cache, message broker, and queue with sub-millisecond response times.

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