Amazon DocumentDB

What is Amazon DocumentDB?

DocumentDB is a fully managed document database service by AWS which supports MongoDB workloads. It is highly recommended for storing, querying, and indexing JSON Data.

Features:

● It is compatible with MongoDB versions 3.6 and 4.0.

● All on-premise MongoDB or EC2 hosted MongoDB databases can be migrated to DocumentDB by using DMS (Database Migration Service).

● All database patching is automated in a stipulated time interval.

● DocumentDB storage scales automatically in increments of 10GB and maximum up to 64TB.

● Provides up to 15 Read replicas with single-digit millisecond latency.

● All database instances are highly secure as they reside in VPCs which only allow a given set of users to access through security group permissions.

● It supports role-based access control (RBAC).

● Minimum 6 read copies of data is created in 3 availability zones making it fault-tolerant.

● Self-healing – Data blocks and disks are continuously scanned and repaired automatically.

● All cluster snapshots are user-initiated and stored in S3 till explicitly deleted.

Best Practices:

● It reserves 1/3rd RAM for its services, so choose your instance type with enough RAM so that performance and throughput are not impacted.

● Setup Cloudwatch alerts to notify users when the database is reaching its maximum capacity.

Use Case:

● Highly beneficial for workloads that have flexible schemas.

● It removes the overhead of keeping two databases for operation and reporting. Store the operational data and send them parallel to BI systems for reporting without having two environments.

Pricing:

● Pricing is based on the instance hours, I/O requests, and backup storage.