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Multi-tenancy is an architecture where a single application instance serves multiple customers (tenants), with each tenant’s data isolated from others. […]

Chaos engineering is the discipline of intentionally injecting failures into production systems to discover weaknesses before they cause outages. The

Cache warming is the process of proactively loading data into a cache before it is needed by real traffic. Without

Load shedding is the deliberate rejection of requests when a system is overloaded — sacrificing some requests to protect the

A monitoring and alerting system collects metrics from distributed services, stores them efficiently, evaluates alert conditions, and notifies on-call engineers.

The thundering herd problem occurs when many processes or threads simultaneously wake up to compete for the same scarce resource

Deleting data is irreversible by default. Soft delete marks records as deleted without removing them from the database; hard delete

Pagination enables clients to retrieve large result sets page by page instead of in one response. Two primary approaches exist:

The Write-Ahead Log (WAL) is the foundation of database durability and crash recovery. Every change to database state is first

CRDTs (Conflict-Free Replicated Data Types) are data structures that can be updated independently and concurrently on multiple nodes without coordination,

OAuth2 is an authorization framework that allows users to grant third-party applications limited access to their accounts without sharing passwords.

GraphQL is a query language for APIs where clients specify exactly the data they need and receive nothing more. Unlike

WebSocket provides full-duplex, low-latency communication between a browser and server over a single persistent TCP connection. Unlike HTTP polling (client

Full-text search finds documents matching natural language queries across large corpora. Unlike exact-match database queries (WHERE name = ‘foo’), full-text

An audit log records a tamper-evident, chronologically ordered history of all significant actions in a system: who did what, when,