Database High Availability Simplified

Comparing SkyCluster and Amazon RDS for Oracle

SkyCluster and Amazon RDS service are two distinct solutions for running Oracle Databases on AWS cloud. Each solution has its advantages in certain usage scenarios. The objective of this comparison is to provide information that will help with selecting one of the two solutions based on customer’s requirements.

SkyCluster Amazon RDS
Key advantages Active-active HA
Full control
Oracle RAC lift-and-shift
Lower administration effort
Solution type Virtual appliance hosted on EC2 instances Database-as-a-Service
Who manages database and OS End-customer or partner AWS
High availability architecture Active-Active based on Oracle RAC.
2, 3, or more DB nodes
Failover time Zero Up to several minutes
Downtime for maintenance No, rolling updates May be needed
Oracle Cloud Control (OEM) Yes No
Database features All Some features not supported
Database size Virtually unlimited with EBS storage 64 TB max
Storage IOPS With EBS: up to 80K per node, scalable with number of nodes.

With local SSDs: over 1M IOPS
Up to 80K per node
Storage throughput With EBS: up to 1750 MB/s per node, scalable with number of nodes.

With local SSDs: up to 40 GB/s
Up to 1750 MB/s
CPU performance Scalable with number of nodes Limited by single EC2 instance
Backup/restore Using RMAN Using storage snapshots
Custom OS security hardening Yes No
Billing By AWS (EC2 + Marketplace fees) By AWS
“We had to migrate dozens of mission critical Oracle RAC databases from Exadata to AWS with FlashGrid SkyCluster, and were able to do it without sacrificing performance or availability.”

Rama Kolli, Sr. Director – Database Management, S&P Global Ratings

“FlashGrid SkyCluster provides us all elements needed for running our mission-critical Oracle databases in Azure: storage and networking software, deployment automation, and 24x7 support.”

Jay Wilder, Sr. Director of Software Engineering, Nuance Communications

“With FlashGrid and AWS we can now deploy a new application within two weeks instead of six months, without compromising our availability SLA.”

David Urban, VP Operations, Aria Systems

“SkyCluster for Azure proved to be a reliable solution that is easy to implement and support for us as a systems integrator.”


“With our new virtualized RAC running on FlashGrid architecture we do a 125GB full table scan in 6 seconds. That is an 11x improvement over our previous setup.”

Sam Shiel, Oracle DBA, Simplyhealth

“Implementing Oracle RAC with FlashGrid in AWS is an important milestone in Digital Virgo’s cloud journey.”

Mikolaj Klimek, Deputy Director IT Operations and Infrastructure, Digital Virgo

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