What is Amazon MemoryDB?
Amazon MemoryDB is AWS’s durable in-memory database for applications with high performance requirements, such as microservices architectures. The service is compatible with the popular open source data stores Valkey and Redis OSS, letting you work with their familiar data structures, APIs, and commands. All data resides in memory, enabling microsecond read latency and low single-digit millisecond write latency. Data is also stored durably across multiple Availability Zones using a Multi-AZ transaction log, enabling fast failover, database recovery, and node restarts.
Core Features
- Valkey and Redis OSS Compatibility: Use familiar data structures, APIs, and commands
- Multi-AZ Durability: Replication to a distributed transaction log across multiple Availability Zones
- Very Low Latency: Microsecond read latency and low millisecond write latency
- Cluster Mode: Horizontal scaling for high throughput
- Automatic Failover: Fast recovery from node failures
Typical Use Cases
Session Management: Store user sessions with low latency and durable persistence, so node failures don’t cause active sessions to be lost.
Gaming Leaderboards: Efficient ranking operations using sorted data structures, with guaranteed persistence even during infrastructure issues.
Real-time Fraud Detection: Process transactions in real time against known patterns, with low latency enabling decisions without noticeable delay to the main transaction.
Benefits
- High in-memory performance combined with database durability
- Compatibility with common Valkey and Redis OSS clients
- No separate caching and persistence layer needed
- Multi-AZ architecture for high availability
Integration with innFactory
As an AWS Reseller, innFactory supports you with Amazon MemoryDB: cluster design, migration from ElastiCache or self-managed Redis/Valkey, performance tuning, and integration into your application architecture.
Typical Use Cases
Frequently Asked Questions
What is Amazon MemoryDB?
MemoryDB is AWS's durable in-memory database, compatible with the open source data stores Valkey and Redis OSS. Unlike a pure cache, MemoryDB stores data durably across multiple Availability Zones using a Multi-AZ transaction log.
What is the difference from ElastiCache?
Amazon ElastiCache is primarily a cache with optional persistence. MemoryDB is designed as a full-fledged primary database where data is durably replicated across multiple Availability Zones, so node failures do not result in data loss.
Which engines are supported?
MemoryDB is compatible with Valkey and with Redis OSS, supporting the common data structures, APIs, and commands of these open source projects. Existing Valkey or Redis OSS clients can typically connect without code changes.
When should I use MemoryDB instead of ElastiCache?
MemoryDB is a good fit when data needs to be stored durably and reliably as a primary database rather than just cached — for example, for session stores, leaderboards, or real-time analytics where data loss is unacceptable.
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