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3. • Client Layer - Used by application to
communicate directly with SQL Database.
• Services Layer – Gateway between Client layer
and Platform layer.
• Platform Layer – Includes physical servicers and
services that support the Services layer.
• Infrastructure Layer – IT administration of the
physical HW and OS.

4. Topics to Review
• Windows Azure SQL Database
• Architecture
• Application Connectivity
• Scalability
• Windows Azure Table Storage
• Architecture
• Querying
• Best Practices and Considerations
• Cost
• Transactions

5. Application Connectivity
Considerations And Best Practices
• login: [login]@[server]
• Idle connections
• Long running transactions
• DoS guard
• Failover events
• Throttling
• Connection pooling and Retry logic
• Latency introduced for updates
• No cross-database dependencies

6. A Seamless Offering from the Private Cloud
to the Public Cloud

7. Scalability Model For The Cloud
Cloud Applications
• Require Scale Beyond Scale-Up
• Demand the Best Economics
• Best Price/Performance
• Elasticity + Pay-as-you-go

8. Obstacles
• Defining the Tenant
• Establishing Tenant’s surrogate key
• Elastic Scalability (Splits/Merges/Tenant Moving)
• Application Lifecycle Management (Dev; Test; Deploy;
Upgrades)
• Overcoming limitations of existing tools & available
features
• Transient nature of connectivity

10. Azure Storage Architecture

11. Table Storage Concepts

12. Table Details
Not an
RDBMS!
Table
Entities

13. No Fixed Schema

14. Querying

15. Purpose of the PartitionKey
Entity Locality
• Entities in the same partition will be stored together
• Efficient querying and cache locality
• Endeavour to include partition key in all queries
Entity Group Transactions
• Atomic multiple Insert/Update/Delete in same partition in a single transaction
Table Scalability
• Target throughput – 20,000 tps/partition, several thousand tps/account
• Windows Azure monitors the usage patterns of partitions
• Automatically load balance partitions
• Each partition can be served by a different storage node
• Scale to meet the traffic needs of your table

16. PARTITIONKEY
(CATEGORY)
ROWKEY
(TITLE)
TIMESTAMP MODELYEAR
Bikes Super Duper Cycle … 2009
Bikes
Quick Cycle 200
Deluxe
… 2007
… … … …
Canoes Whitewater … 2009
Canoes Flatwater … 2006
PARTITIONKEY
(CATEGORY)
ROWKEY
(TITLE)
TIMESTAMP MODELYEAR
Rafts 14ft Super Tourer … 1999
… … … …
Skis
Fabrikam Back
Trackers
… 2009
… … … …
Tents Super Palace … 2008
PARTITIONKEY
(CATEGORY)
ROWKEY
(TITLE)
TIMESTAMP MODELYEAR
Bikes Super Duper Cycle … 2009
Bikes
Quick Cycle 200
Deluxe
… 2007
… … … …
Canoes Whitewater … 2009
Canoes Flatwater … 2006
Rafts 14ft Super Tourer … 1999
… … … …
Skis
Fabrikam Back
Trackers
… 2009
… … … …
Tents Super Palace … 2008
Partitions and Partition Ranges