Memorystore (Redis & Memcached)

Memorystore is Google Cloud's fully managed in-memory data store service. It supports two popular engines — Redis and Memcached — and provides sub-millisecond data access for caching, session management, leaderboards, and real-time analytics.

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What Is Memorystore?

Memorystore provides fully managed instances of Redis and Memcached that run on Google's infrastructure:

• No infrastructure to manage — Google handles provisioning, patching, failover, and monitoring.
• Sub-millisecond latency — data is stored entirely in memory.
• VPC-native — instances are accessible only from within your VPC, ensuring network security.
• Automatic failover — Redis Standard tier provides high availability with automatic failover.

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Memorystore for Redis

Key Features

• Redis 5.0, 6.x, and 7.x — supports standard Redis data structures (strings, hashes, lists, sets, sorted sets, streams, JSON).
• Standard tier — provides high availability with a replica in a different zone and automatic failover.
• Basic tier — single instance without replication; suitable for development and non-critical caching.
• Redis AUTH — password-based authentication.
• In-transit encryption — TLS for secure communication.
• RDB snapshots — periodic snapshots for data persistence and recovery.
• Instance sizes — from 1 GB to 300 GB of memory.

Use Cases

Use Case	Description
Caching	Cache frequently accessed data (database queries, API responses, session tokens)
Session management	Store user sessions for web applications
Leaderboards	Use sorted sets for real-time ranking
Rate limiting	Track API request counts per client
Pub/Sub messaging	Lightweight publish-subscribe messaging between services
Real-time analytics	Aggregate counters, HyperLogLog for unique counts
Feature flags	Store and distribute feature toggles with low latency

Scaling

• Vertical scaling — increase or decrease the instance memory size.
• Read replicas — add up to 5 read replicas to scale read throughput (Standard tier).
• Redis Cluster mode — for instances larger than 300 GB, Redis Cluster distributes data across multiple shards.

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Memorystore for Memcached

Key Features