Oracle is eating its own dog food.
Here is an interesting slide set from OOW11 about how Oracle is using it’s own hardware and software.
Still a lot of Oracle appserver to see instead of WebLogic..
Usage of Oracle Exadata, Exalogic, Oracle Fusion Middleware and Enterprise Manager within Oracle
October 12, 2011 by Leave a Comment
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November 17, 2010 by
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AWS Relational Database Service (RDS): Read Replicas & Multi-AZ Instances
October 22, 2010 by Leave a Comment
Friday morning. Second cup of coffee. I remember the discussion I had yesterday about the differences of RDS read replicas vs. multi-AZ instances in the Amazon compute cloud.
Actually these concepts are completely different. So it is important to pick the right one that supports your design. Here is a short comparison:
| Multi-availability zone instances | Read replicas | |
| Purpose | Availability | Scalability |
| Number of copies | 1 primary + 1 secondary | 1 primary + n secondaries |
| Secondaries used during normal operation? | No | Yes |
| Synchronization | Synchronous | Asynchronous |
| Use with ELB | No (only one active) | Not supported |
| Use with elastic IPs | Not supported | Not supported |
| Cost | Doubles | Per Instance |
And don’t forget you can use a combination of both.
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