Amazon MemoryDB for Redis
Redis-compatible, durable, in-memory database service for ultra-fast performance
750 hours of MemoryDB on t4g.small instances
for 2 months with Amazon Web Services Free Tier in Amazon Web Services China (Ningxia) region
How it works

Use cases
Build web and mobile applications
Use versatile Redis data structures like streams, lists, and sets to build content data stores, chat and message queues, and geospatial indexes for demanding, data-intensive web and mobile applications that require low latency and high throughput.
Quickly access customer data for retail
Deliver personalized customer experiences and manage user profiles, preferences, and inventory tracking and fulfillment with microsecond read and single-digit millisecond write latency.
Develop online games
Build player data stores, session history, and leaderboards for gaming applications that require massive scale, low latency, and high concurrency to make real-time updates.
Stream media and entertainment
Run high concurrency streaming data feeds to ingest user activity and support millions of requests per day for media and entertainment applications.