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RDS Basics

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  5. RDS Basics
  • Expands to Relational Database Service
  • Eliminates much of relational database management
  • Can be scaled independently
    • CPU
    • memory
    • storage
    • IOPS 
  • AWS manages
    • backups
    • software patching
    • automatic failure detection
    • recovery
  • Can trigger, manual or automated backups
  • It provides high availability with primary instance which if fails, switch to secondary instance
  • Has a soft limit of 40 Amazon RDS DB instances per account
  • From 40, up to 10 can be Oracle or Microsoft SQL Server DB instances under the License Included model.
  • Customers can Bring Your Own License (BYOL) model to have all 40 DB instances for Oracle or Microsoft SQL Server
  • Supports database engines
    • MySQL
    • MariaDB
    • PostgreSQL
    • Oracle
    • Microsoft SQL Server
    • MySQL-compatible Amazon Aurora
    • AWS IAM controls AWS resources access to Amazon RDS databases.
  • For security
    • put database in an Amazon Virtual Private Cloud (Amazon VPC)
    • using Secure Sockets Layer (SSL) for data in transit
    • Using encryption for data at rest
  • RDS Management by
    • RDS APIs
    • AWS Management Console
    • Both are used to
      • Create RDS DB instances
      • Delete RDS DB instances
      • Modify RDS DB instances
      • terminate RDS DB instances
      • create DB snapshots
      • perform restores
    • Amazon RDS has no data API
  • DNS endpoint is given for database connection after database creation
  • Endpoint does not change over the lifetime of the instance even during the failover in case of Multi-AZ configuration
  • EBS volumes are used as data store by RDS
  • database backups in RDS are replicated in multiple AZs
    • synchronous replication is done amongst primary and standby instance
  • DNS endpoint switches to standby instance during primary failure
  • Read replicas are also provided by RDS
    • asynchronous replication is done
    • only for supported databases
  • RDS Provisioned IOPS, where the IOPS can be specified when the instance is launched and is guaranteed over the life of the instance

AWS RDS limits per region

Resource Default Limit
Maximum Cross-region snapshots copy requests 5
Maximum DB Instances 40
Maximum Event subscriptions 20
Total Manual snapshots 100
Count of Option groups 20
Count of Parameter groups 50
Count of Read replicas per master 5
Count of Reserved instances 40
Count of Rules/DB security group 20
Count of Rules/VPC security group 50 inbound 50 outbound
Count of DB Security groups 25
Count of VPC Security groups 5
Count of Subnet groups 50
Count of Subnets per subnet group 20
Count of Tags/resource 50
Total storage for all DB instances 100 TiB
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