4. Application Internet Azure Cloud Internet Azure Cloud LB TDS (tcp) Applications use standard SQL client libraries: ODBC, ADO.Net, PHP, … Load balancer forwards ‘sticky’ sessions to TDS protocol tier Security Boundary SQL Gateway Gateway: TDS protocol gateway, enforces AUTHN/AUTHZ policy; proxy to CloudDB Scalability and Availability: Fabric, Failover, Replication, and Load balancing

6. Gateway Process TDS Endpoint AdminSvc Endpoint Protocol Parser Provisioning Endpoint Business Logic Services Connection Mgmt SQL Scalability and Availability: Fabric, Failover, Replication, and Load balancing

9. Datacenter (Sub-Region) Customer Browser Portal LB 11 Front-end Node Live DNS Cluster Live DNS Svc 2244 Gateway Backend Node Mgmt. Services SQL Server Fabric Backend Node Mgmt. Services SQL Server Fabric Mgmt. Services SQL Server Fabric Front-end Node Gateway Front-end Node Admin Portal Front-end Node Admin Portal 33 Gateway LB 556677

11. TDS Gateway Front-end Node Protocol Parser Gateway Logic Master Cluster Master Node Master Node Components 112233556677 Scalability and Availability: Fabric, Failover, Replication, and Load balancing 4488 TDS Session Backend Node 1 SQL Instance SQL DB Backend Node 2 SQL Instance SQL DB Backend Node 3 SQL Instance SQL DB

13. TDS Gateway Front-end Node Protocol Parser Gateway Logic Global Partition Map Master Node Master Node Components 1122445566 Scalability and Availability: Fabric, Failover, Replication, and Load balancing 3377 TDS Session Backend Node 1 SQL Instance SQL DB Backend Node 2 SQL Instance SQL DB Backend Node 3 SQL Instance SQL DB 88

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20. © 2009 Microsoft Corporation. All rights reserved. Microsoft, Windows, Windows Vista and other product names are or may be registered trademarks and/or trademarks in the U.S. and/or other countries. The information herein is for informational purposes only and represents the current view of Microsoft Corporation as of the date of this presentation. Because Microsoft must respond to changing market conditions, it should not be interpreted to be a commitment on the part of Microsoft, and Microsoft cannot guarantee the accuracy of any information provided after the date of this presentation. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.