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.
