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rds-and-aurora.md

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RDS

RDS Proxy

  • Fully managed database proxy for RDS
  • Allows apps to pool and share DB connections established with the database
  • Improving database efficiency by reducing the stress on database resources (e.g CPU, RAM)and minimize open connections (and timeouts)
  • Serverless, autoscaling, highly available (multi-AZ)
  • Reduced RDS and Aurora failover time by up 66%
  • Supports RDS (MySQL,PostgreSQL, MariaDB, MS SQL Server) and Aurora (MySQL, PostgreSQL)
  • No code changes required for most apps
  • Enforce IAM authentication for DB, and securely store credentials in AWS Secrets Manager
  • RDS proxy is never publicly accessible

Aurora

  • Fully managed Postgres or MySQL compatible database designed by default to scale and fine-tuned to be really fast
  • Aurora automatically grows in increments of 10GB, up to 128 TB

Introduction to Aurora

  • Combines the speed and availability of high-end databases with the simplicity and cost-effectiveness of open source databases
  • Aurora can run either MySQL or Postgres compatible engines
  • Aurora MYSQL is 5x better performance than traditional MySQL
  • Aurora Postgres is 3x better performance than traditional Postgres
  • Aurora Costs more than RDS (20% more) but is more efficient

Aurora Availability

  • 6 copies of your data in 3 AZ:
    • Needs only 4 out of 6 copies for writes (so if one AZ is down then it is fine)
    • Need only 3 out of 6 for reads
    • self healing with peer-to-peer replication
    • Storage is striped across 100s of volumes
  • Automated failover for master happens in less than 30 seconds
  • Master + up to 15 Aurora Read Replicas serve reads

Fault Tolerance and Durability

  • Aurora Backup and Failover is handled automatically

  • Snapshots of data can be shared with other AWS accounts

  • Storage is self-healing , in that data blocks and disks are continuously scanned for errors and repaired automatically

Aurora Replicas

Amazon Aurora Replicas Mysql Read Replicas
Number of Replicas Up to 15 Up to 5
Replication Type Asynchronous(ms) Asynchronous (s)
Performance impact on primary Low High
Act as failover target Yes (no data loss) Yes (potentially minutes of data loss)
Automated failover Yes No
Support for user-defined replication delay No Yes
Support for different data or schema vs primary No Yes

Aurora Serverless

  • Aurora except the database will automatically start up, shut down, and scale capacity up or down based on your application's needs
  • Apps used a few minutes several times per day or week, eg. low-volume blog site
  • pay for database storage and the database capacity and I/O your database consumes while it is active