Developing on SQL Azure
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Developing on SQL Azure

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This is the slide deck from my SQL In The City presentation in LA on October

This is the slide deck from my SQL In The City presentation in LA on October

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  • This is you
  • You are very good looking.
  • You are sailing safely on the waters of an ON PREMISE SQL SERVER….You know these waters…and they are comfortable.
  • What’s that up ahead?
  • It’s a cloud! A SQL Azure Cloud! And it look unavoidable…yet fun! You decide to consult your map, to learn more about what might be in that cloud.
  • That dragon on the map looks scary!
  • But when you look closer at the real dragon, you find that it’s not so scary…in fact, kind of harmless….

Developing on SQL Azure Developing on SQL Azure Presentation Transcript

  • Top 5 Things Developers Should Know @ SQL Azure By Ike Ellis http://www.ellisteam.net @ike_ellis ike@ellisteam.net P: 619.922.9801
  • Before the DragonsQuick Demo: How to Sign Up• Free Accounts – BizSpark – MSDN Subscription – 30 day trial • Bing SQL Azure 30 day trial….there are coupons and instructions. • Look on the SQL Azure Team Blog – Remember: Microsoft wants you to use this, there’s a way to try it for free…
  • Architecture
  • Before the Dragons: Architecture -Logical/Physical Databases/Servers
  • Dragon #1: The ConnectionString
  • Your SQL Server Your AppChange Connection String SQL Azure
  • 5 Things Make Up a Connection String• What are they?
  • 5 Things Make Up a Connection String• What are they? – UserName – Password – Database(Catalog) – ServerName – ProviderName
  • #1 ConnectionString<add name="FlashcardEntities"connectionString="metadata=res://*/Models.FlashcardData.csdl|res://*/Models.FlashcardData.ssdl|res://*/Models.FlashcardData.msl;provider=System.Data.SqlClient;provider connectionstring=&quot;Data Source=etnejn2aev.database.windows.net;Initial Catalog=flashcards;IntegratedSecurity=False;User ID=***(username@servername);Password=*******;MultipleActiveResultSets=True;Encrypt=True(negotiated);TrustServerCertificate=False&quot;" providerName="System.Data.EntityClient" />
  • Connection Providers• Use ADO.NET, ODBC, PHP (NOT OLE DB) – Client libraries pre-installed in Azure roles – Support for ASP.NET controls• Clients connect directly to a database – Cannot hop across DBs (no USE) – May need to include <login>@<server> – Use familiar tools (sqlcmd, osql, SSMS, etc) – Use connection pooling for efficiency• SSMS 2008 R2 can connect – http://blogs.msdn.com/ssds/archive/2009/11/11/9921041.aspx• SSRS, SSIS, SSAS can all connect to SQL Azure using the right provider.
  • Typical ADO.NET Connection.Open()try
{
 using (SqlConnection conn = new SqlConnection(sqlConnectionString))
 {
 using (SqlCommand cmd = new SqlCommand(sqlStatement, conn))
 {
 conn.Open(); using (SqlDataReader dr = cmd.ExecuteReader())
 {
 while (dr.Read())
 {
 }
 }
 }
 }
}catch (SqlException ex)
{
 SxpLog.WriteSqlException(ex, "some", "other", "data");
}
  • New Connection.Open())string sqlContext = string.empty;try
{
 using (SqlConnection conn = new SqlConnection(sqlConnectionString))
 {
 using (SqlCommand cmd = new SqlCommand(sqlStatement, conn))
 {
 sqlContext = GetSqlContextInfo(conn); using (SqlDataReader dr = cmd.ExecuteReader())
 {
 while (dr.Read())
 {
 }
 }
 }
 }
}catch (SqlException ex)
{
 SxpLog.WriteSqlException(ex, sqlContext, "some", "other", "data");
}
  • GetSqlContextInfo• http://blogs.msdn.com/b/bartr/archive/2010/06/18/sql-azure-connection- retry.aspx?utm_source=feedburner&utm_medium=twitter&utm_campaign=Feed:+Microsoft/MSDN- Blogs+(MSDN+Blogs)
  • Dragon #2: Throttling, Disaster Recovery, & Some New Errors
  • Throttling
  • Throttling• Throttling Service – Protects a machine from sustained high usage of system resources – Evaluate actual resource usage vs. safe thresholds real-time – Throttle the busiest days first• Throttling shows as connection error 40501 – The service is currently busy. Retry the request after 10 seconds…• Needs Decoding
  • Throttling Scenario #1• Customer A uses 30% of the CPU on the server• Customer B comes in and starts using 70% of the CPU on the server• Customer B triggers the throttling event• Customer B gets throttled
  • Throttling Scenario #2• Customer B uses 70% of the CPU on the server• Customer A comes in and uses 30% of the CPU on the server• Customer A triggers the throttling event• Customer B gets throttled
  • Throttling Class – Trace Young• http://social.technet.microsoft.com/wiki/contents/ar ticles/sql-azure-performance-and-elasticity- guide.aspx#Code_Sample_Decoding_SQL_Azure_Rea son_Codes
  • Another Reason We Need Retry Code =Disaster Recovery/Database Replicas
  • Dragon #2: Some New Errors1. 40550 - Session has been terminated because it has acquired too many locks. Try reading or modifying fewer rows in a single transaction. (Greater than 1,000,000 locks)2. 40551 - Session has been terminated because of excessive TempDB Usage(TempDB is only allowed to be 5GB in size)3. 40552 - Session used too much of the transaction log. try modifying fewer rows in a single transaction. (Transaction consuming excessive log resources are terminated. The max permitted log size for a single transaction is 1GB)4. 40544 - Database reached its max size. Switched to read-only5. 40553 - Session is terminated because of excessive memory usage. (Where there is memory contention, sessions consuming greater than 16MB for more than 20 seconds are terminated in the descending order of time the resource has been held)6. 40549 - Session is terminated because of a long running transaction (SQL Azure kills all transactions after 24 hours.)7. 40501 The service is currently busy. Retry the request after 10 seconds. Code: %d (SQL Azure might terminate the transactions and disconnect the sessions when the CPU utilization, input/output I/O latency, and the number of busy workers exceed thresholds.
  • Dragon #3: Tooling• SQL Azure Database Manager – Silverlight Tool• SSMS 2008 R2 – Standard Tool
  • Dragon #4: DB Migration• SSIS• BCP• SSMS – Generate Scripts• DEMO: SQL Azure Migration Wizard
  • Dragon #5: Performance Tuning• Let’s get this out of the way – What we don’t have:• no sql error log• no sql profiler• no pssdiag• no bpa (best practices analyzer)• no xevent• no server side network capture• no mps reports(microsoft product support reports)• Only some DMVs
  • SQL Azure Performance Guide1) Missing Indexes or better indexes 1) Use DMVs 2) Use Query Plans2) Covering indexes for the WHERE clause3) Can sorting be done on the client?4) Minimize round trips5) Limit records (paging)6) Use Connection Pooling (open connection late, close them early)7) Retry Logic (wait 10 seconds and then retry)8) Catch errors and understand that when azure throws an error, the tran rollback9) Caching and batching - evaluate caching and batching to limit round-trips to the server10) avoid latency - choose a data center nearest to your location11) Trace connections - traced connections using context_info() to troubleshoot connectivity issues12) CALL SUPPORT
  • What I Didn’t Cover, But You MightWant to Research• Pricing• Included/Excluded Features• Product Roadmap• SQL Azure Reporting• Backup/Restore Options• SQL Azure Data Sync• SQL Azure Odata• Future Differences Between Editions
  • Good Resources• SQL Azure Team Blog & Twitter – http://blogs.msdn.com/b/sqlazure/ – Twitter: @sqlazure• Inside SQL Azure – Kalen Delaney – http://social.technet.microsoft.com/wiki/contents/articles/inside-sql-azure.aspx• SQL Azure & Entity Framework – Julie Lerman – http://msdn.microsoft.com/en-us/magazine/gg309181.aspx – Doesn’t cover the retry issue.• My Site – Ike Ellis – http://www.ellisteam.net – Twitter: @ike_ellis• .NET ROCKS – SQL Azure Migration Wizard – December, 2009 – http://www.dotnetrocks.com/default.aspx?showNum=512• Scott Klein & Herve Rogerro Book – http://www.amazon.com/Pro-Azure-Experts-Voice- NET/dp/1430229616/ref=sr_1_1?ie=UTF8&qid=1297792245&sr=8-1• MY O’REILLY BOOK IS COMING THIS SPRING! – Yes, it has an animal cover.
  • Red Gate Tools for SQL Azure• SQL Compare• SQL Data Compare• SQL Azure Backup
  • DBA role places more focus on logical management• SQL Azure focus on logical administration – Schema creation and management – Query optimization – Security management (Logins, Users, Roles)• Service handles physical management – Automatically replicated with HA “out of box” – Transparent failover in case of failure – Load balancing of data to ensure SLA
  • Database Backup Today = Full Copy
  • Backup / Restore – Database Copy• CREATE DATABASE TechBio2 AS COPY OF servername. TechBio• Select * from sys.dm_database_copies• No point in time
  • Hope for the Future
  • Until Then• Red-Gate has a tool – No Point In Time Restore – Brings the database on-premise! And Restores from on-premise!
  • Contact Ike• Email: ike@ellisteam.net• Twitter: @ike_ellis• Website: http://www.ellisteam.net• Phone: 619.922.9801• User Group: http://www.sdtig.com• DevelopMentor Courses: http://www.develop.com