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Redis (cluster mode enabled vs disabled) vs Memcached

Redis (cluster mode enabled)

Redis (cluster mode disabled)

Memcached

Data Types

string, sets, sorted sets, lists, hashes, bitmaps, hyperloglog, geospatial indexes

string, sets, sorted sets, lists, hashes, bitmaps, hyperloglog, geospatial indexes

string, objects (like databases)

Data Partitioning (distribute your data among multiple nodes)

Supported

Unsupported

Supported

Modifiable cluster

Only versions 3.2.10 and later 

Yes

Yes

Online resharding

Only versions 3.2.10 and later 

No

No

Encryption

3.2.6, 4.0.10 and later

3.2.6, 4.0.10 and later

Unsupported

Sub-millisecond latency

Yes

Yes

Yes

FedRAMP, PCI DSS and HIPAA compliant

3.2.6, 4.0.10 and later

3.2.6, 4.0.10 and later

No

Multi-threaded (make use of multiple processing cores)

No

No

Yes

Node type upgrading

No

Yes

No

Engine upgrading

Yes

Cluster replication (create multiple copies of a primary cluster)

Supported

Supported

Unsupported

Multi-AZ for automatic failover

Required

Optional

Unsupported

Transactions (execute a group of commands as an isolated and atomic operation)

Supported

Supported

Unsupported

Pub/Sub capability

Yes

Yes

No

Backup and restore (keep your data on disk with a point in time snapshot)

Supported

Supported

Unsupported

Lua Scripting (execute transactional Lua scripts)

Supported

Supported

Unsupported

Use case

  • You need to partition your data across two to 250 or 500 nodes if the Redis engine version is 5.0.6 or higher.(clustered mode only).

  • You need geospatial indexing (clustered mode or non-clustered mode).

  • You don’t need to support multiple databases.

  • Plus features of non-clustered mode
  • You need complex data types, such as strings, hashes, lists, sets, sorted sets, and bitmaps.

  • You need to sort or rank in-memory datasets.

  • You need persistence of your key store.

  • You need to replicate your data from the primary to one or more read replicas for read intensive applications.

  • You need automatic failover if your primary node fails.

  • You need pub/sub capabilities.

  • You need backup and restore capabilities.

  • You need to support multiple databases.
  • You need the simplest model possible.

  • You need to run large nodes with multiple cores or threads.

  • You need the ability to scale out and in, adding and removing nodes as demand on your system increases and decreases.

  • You need to cache objects, such as a database.

  • Needs Auto Discovery to simplify the way an application connects to a cluster.

redis replication

Note: If you are studying for the AWS Certified Database Specialty exam, we highly recommend that you take our AWS Certified Database – Specialty Practice Exams and read our Database Specialty exam study guide.

AWS Certified Database Specialty Practice Exams

Sources:
https://docs.aws.amazon.com/AmazonElastiCache/latest/mem-ug/SelectEngine.html
https://aws.amazon.com/elasticache/redis-vs-memcached/
https://docs.aws.amazon.com/AmazonElastiCache/latest/red-ug/Replication.Redis-RedisCluster.html

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