SQL Server to SQL Azure: Migration ChallengesVirgílio Esteves

XVII Encontro – 29/11/2011

Virgílio EstevesID&T – Research Leader @HIS

&Founder of NetPonto Coimbra

C# / WPF / Silverlight / XNA / Azure

Challenges Data Storage

Connectivity

Authentication

Schema

T-SQL Supportability

Replication & Log Shipping

Data Storage

SQL Server No size limits

SQL Azure Web Edition

1GB or 5GB Business Edition

10GB » 50GB (10GB increments)

Connectivity

Tools Connection management

Connectivity: Tools SQL Server

Management Studio (SSMS) SQLCMD Profiler

SQL Azure Management Studio (SSMS) [2008 R2+] SQLCMD Portal

SQL Azure Network TopologyApplication

LoadBalancer

InternetAzure

SQL Azure Fabric – Automatic Failover, Replication and Load Balancing

TDS Protocol Gateway – Proxy to Backend SQL Server

Security Boundary

Forwards “sticky” sessionsto TDS protocol tier

TDS (tcp)

TDS (tcp)

LoadBalancer

LoadBalancer

LoadBalancer

LoadBalancer

LoadBalancer

SQLServer

SQLServer

SQLServer

SQLServer

SQLServer

SQLServer

Connectivity: Connection Management

SQL Server No “default” connection termination

SQL Azure Connection termination at server discretion “Coded” reason codes

Connection Termination: Causes Lock consumption Uncommitted transactions Transactions blocking system calls Log file size TempDB usage and size Excessive memory usage Maximum database size reached

Connection Termination: Causes

Idle connections Long running transactions Denial of Service attacks Network problems Failover problems Load balancer discretion

“Coded” Reason Codes

Authentication

SQL Server SQL Authentication Windows Authentication

SQL Azure SQL Authentication

Schema

SQL Server No limitations

SQL Azure Doesn’t support heaps All tables must have a clustered index

T-SQL Supportability

SQL Server No limitations

SQL Azure Some are fully supported Some are partially supported Some are fully unsupported

T-SQL: Fully or Partially Supported Constants Constraints Cursors Index management and rebuilding Local temporary tables Reserved keywords Spatial data and indexes Stored procedures Triggers

T-SQL: Fully or Partially Supported User-defined functions Statistics management Transactions Tables, joins and table variables Create/Drop databases Create/Alter/Drop tables Create/Alter/Drop users and logins Views

T-SQL: Unsupported

Common Language Runtime (CLR) Database file placement Database mirroring Distributed queries Distributed transactions Filegroup management

T-SQL: Unsupported

Global temporary tables SQL Server configuration options SQL Server Service Broker System tables Trace flags

Replication & Log Shipping

SQL Server Fully supported

SQL Azure Not supported

Is there more?!?Yes… But some things come to the rescue

Links worth looking…

SQL Azure Migration Wizard (http://sqlazuremw.codeplex.com/)

SQL Azure Backup (http://www.red-gate.com/products/dba/sql-azure-backup/)

Supported T-SQL Statements (http://msdn.microsoft.com/en-us/library/ee336270.aspx)

Partially Supported T-SQL Statements (http://msdn.microsoft.com/en-us/library/ee336267.aspx)

Unsupported T-SQL Statements (http://msdn.microsoft.com/en-us/library/ee336253.aspx)

SQL Azure Guidelines and Limitations (http://msdn.microsoft.com/en-us/library/ff394102.aspx)

Questions?

Thanks!

Virgílio Estevesraposo@gmail.com

http://pontonetpt.com/blogs/raposohttp://twitter.com/vraposohttp://pt.linkedin.com/in/virgilioesteves