Redis

1. Data Types

   Strings, lists, sets, sorted sets, hashes, bitmaps, HyperLogLog, geospatial indexes and choosing the right structure.

2. Keys and Expiration

   Key naming, TTL and expiry, SCAN iteration and keyspace commands.

3. Pipelining and Client Protocol

   Round-trip latency, command pipelining and the RESP protocol.

4. Transactions

   MULTI/EXEC, optimistic locking with WATCH and atomicity guarantees.

5. Lua Scripting and Functions

   EVAL scripts, atomic server-side logic, Redis functions and script caching.

6. Pub/Sub

   Channels, publish and subscribe, pattern subscriptions and keyspace notifications.

7. Streams

   Append-only log, consumer groups, acknowledgements, pending entries and stream trimming.

8. Eviction and Caching

   maxmemory, LRU and LFU eviction policies and using Redis as a cache.

9. Client-Side Caching

   Server-assisted client-side caching, tracking and invalidation messages.

10. Persistence

    RDB snapshots, AOF logging, fsync policies and durability trade-offs.

11. Replication

    Leader-replica replication, asynchronous sync, partial resync and replica read scaling.

12. High Availability with Sentinel

    Automatic failover, monitoring, quorum and Sentinel configuration.

13. Scaling with Redis Cluster

    Hash slots, sharding, resharding, multi-key limits and hash tags.

14. Security and ACLs

    Authentication, ACL users and permissions, TLS and network exposure.

15. Search and Query

    Secondary indexes, full-text search, JSON documents and vector similarity search.

16. Probabilistic Data Structures

    Bloom filters, cuckoo filters, count-min sketch, top-k and t-digest.

17. Latency and Optimization

    Diagnosing latency, slow log, memory fragmentation and big keys.

Each section links to the official page. Titles and summaries by Extra Credit; the docs belong to their authors.

Source: endoflife.date

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