Relational Database Services

Relational Database Services

-RDS Features:

Read Replication
Multi-AZ Deployment
Automatic Minor Version Upgrades
Database shutdown
Snapshots

-DB Subnet Groups:

Whenever RDS is created it needs atleast two subnet-ids
Database Subnets help in selecting network and subnets (regions and AZs)

-Reserved Instances:

Give a long-term commitment to Amazon for 1 or 3 years for RDS usage can save costs upto 58%

Read Replication:

-Multi-AZ Deployment

Database is created in multiple AZs
Due to this failover is automatic
Costs will be on the higher side.

-Automatic Minor Version Upgrades
User can enable this feature which upgrades minor releases but you have to suggest the time period when your database is used less (maintenance Window).

-Database Shutdown
Database can be stopped or rebooted.
Database can be shutdown only for 1 day continuously.

-Database Snapshots
Backup of Database is called as snapshots
Snapshots can be created manually or you can schedule them.