Amazon ElastiCache

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What is Amazon ElastiCache

Amazon ElastiCache is a managed, in-memory data store service on AWS that supports Redis and Memcached engines. It is primarily used by application teams to reduce database load and improve response times for caching, session storage, real-time leaderboards, and other low-latency key-value access patterns. The service handles provisioning, patching, backups (engine-dependent), and scaling options within the AWS environment. It is typically deployed alongside other AWS services and applications that require sub-millisecond reads and high throughput.

Managed Redis and Memcached

ElastiCache provides managed deployments for Redis and Memcached, reducing the operational work of installing, patching, and maintaining clusters. It supports common cache patterns and ephemeral data use cases where in-memory performance matters. For Redis, it includes features such as replication and automatic failover options depending on configuration. This makes it suitable for teams that want Redis/Memcached capabilities without running the infrastructure themselves.

Low-latency in-memory performance

Because it is an in-memory service, ElastiCache is designed for high-throughput reads and writes with very low latency compared with disk-based databases. It is commonly used to offload read-heavy workloads from primary databases and to store transient application state. This aligns well with use cases like caching query results, user sessions, and rate limiting. Performance characteristics are predictable when data fits in memory and access patterns are cache-friendly.

AWS integration and controls

ElastiCache integrates with AWS networking and security primitives such as VPC, security groups, IAM-based access patterns (service-level), and KMS (for encryption at rest where supported). It also integrates with AWS monitoring and logging tools (for example, CloudWatch metrics and events) for operational visibility. These integrations simplify deployment in AWS-centric architectures. Organizations already standardized on AWS can align ElastiCache with existing governance and operational processes.

Not a general-purpose database

ElastiCache is primarily a caching and in-memory key-value layer rather than a full-featured operational database. It does not provide the same breadth of query capabilities, indexing options, or multi-model features found in several NoSQL and database platforms. Data is typically treated as transient or derived, and application design must account for cache invalidation and misses. For durable system-of-record workloads, teams usually pair it with another database service.

Engine and feature constraints

Capabilities vary by engine (Redis vs. Memcached) and by deployment mode, which can complicate standardization across teams. Some advanced Redis features and operational behaviors depend on the specific Redis offering and configuration choices (for example, cluster mode, replication, and backup behavior). Memcached lacks persistence and has a simpler feature set, which limits it to straightforward caching. Teams may need to adjust application behavior to match the selected engine’s constraints.

AWS lock-in and portability

ElastiCache is an AWS-managed service, so operational tooling, deployment patterns, and integrations are AWS-specific. Migrating to another cloud or to self-managed Redis/Memcached typically requires re-provisioning and reworking automation, monitoring, and security configurations. Network placement and latency assumptions are also tied to AWS regions and VPC design. This can increase switching costs for multi-cloud strategies.

Plan & Pricing

Pricing model: Pay-as-you-go (On‑demand nodes, Serverless) with options for Reserved Nodes (1- or 3-year terms) and Database Savings Plans.

On-demand nodes (per-node hourly): Prices vary by node type, engine, and Region — billed per node-hour. Examples from the official AWS pricing page (U.S. East example context):

cache.r7g.xlarge = $0.350 per hour (example). cite
cache.r7g.xlarge = $0.437 per hour (another example scenario). cite
cache.r6gd.16xlarge on‑demand price = $9.9816 per hour (example). cite
cache.r6g.16xlarge on‑demand price = $6.567 per hour (example). cite

Serverless (usage-based): Metered by data stored (GB‑hours) and ElastiCache Processing Units (ECPUs). Example rates shown on the official page (engine-dependent):

Valkey / Redis OSS example: $0.0837 per GB‑hour (data storage) and $0.00227–$0.002278 per 1M ECPUs. cite
Memcached example: $0.125 per GB‑hour and $0.00340 per 1M ECPUs. cite

Reserved nodes: 1‑yr and 3‑yr reservations with No Upfront / Partial Upfront / All Upfront options; discounts quoted up to ~55% vs on‑demand. Example: cache.m7g.xlarge three‑year all‑upfront effective hourly = $0.114/hr (example). cite

Database Savings Plans: Available as an alternative commitment model (commit $/hour for 1‑year term) for additional savings. cite

Backup storage: $0.085 per GiB‑month for backups (all Regions). cite

Data transfer examples/notes: No charge for data transfer between EC2 and ElastiCache within same AZ; cross‑AZ EC2→ElastiCache transfer example $0.01/GB (regional EC2 transfer charge applied); Global Datastore outgoing replication example $0.02/GB (examples shown). cite

Notes: Official AWS page repeatedly states that actual on‑demand node prices vary by Region and node type and that customers should consult the AWS Pricing Calculator / regional pricing tables for exact per‑SKU rates. cite

Seller details

Amazon Web Services, Inc.

Seattle, Washington, USA

2006

Subsidiary

https://aws.amazon.com/

https://x.com/awscloud

https://www.linkedin.com/company/amazon-web-services/

Tools by Amazon Web Services, Inc.

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Amazon ElastiCache

What is Amazon ElastiCache

Managed Redis and Memcached

Low-latency in-memory performance

AWS integration and controls

Not a general-purpose database

Engine and feature constraints

AWS lock-in and portability

Plan & Pricing

Seller details

Tools by Amazon Web Services, Inc.

Best Amazon ElastiCache alternatives

Popular categories

Generative AI & LLM

Agents, autonomous & workflow automation

Vertical AI

Sales

Marketing

Security

Analytics

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Commerce

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