SQL in the City, London, 2014: How to speed up .NET and SQL Server web apps
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How to speed up .NET and SQL Server web apps Bart Read
Transcript of SQL in the City, London, 2014: How to speed up .NET and SQL Server web apps
How to speed up .NET and SQL Server web
appsBart Read
Who am I?• Bart Read, Consultant, Software Engineer• .NET, SQL Server, performance tuning, project management
• Previously worked for Red Gate• Contacts• E: [email protected]• W: www.bartread.com• B: www.bartread.com/blog• T: @bart_read• GH: https://github.com/bartread
General Web Performance
http://www.bartread.com/2014/06/03/web-performance-how-fast-does-website-need-to-be/
Tools of the Trade
.NET Performance & Memory Profilers
SSMS & SQL Profiler
Load Testing
SQL Server Monitoring Tools
Useful Ancillary Tools
Scenario 1The Slow Support Centre
Customer Support Centre
(MS Dynamics)
Grant Fritchey’s FREE eBook on execution plans:
http://www.red-gate.com/community/books/sql-server-execution-plans-ed-2
Scenario 2The Memory Leak in the eCommerce Site
eCommerce Site
(MS Dynamics)
Other technologies:- NServiceBus- Endeca
Solution (Nasty Hack)
container.Kernel.ReleasePolicy = new NoTrackingReleasePolicy();
(Creating some technical debt for the future.)
Scenario 3Locking, Blocking and Deadlocking
Locking, Blocking & Deadlocking
Concurrency• Object level concurrency• Row level concurrency
Transaction Isolation Levels• Read Uncommitted• Read Committed <- SQL Server default• Repeatable Read• Snapshot• Serializable
ACID
Locking pattern• Reads• A -> B -> C -> D -> A -> B -> C -> D -> E -> A …• Etc.
• Writes• A –> B -> C -> D -> E -> A -> B -> A -> B -> C -> D …• Etc.
Solutions• DEADLOCK_PRIORITY• http://msdn.microsoft.com/en-us/library/ms186736.aspx• SET DEADLOCK_PRIORITY LOW | NORMAL | HIGH
• Read Committed Snapshot Isolation• http://www.brentozar.com/archive/2013/01/implementing-snapshot-or-read-
committed-snapshot-isolation-in-sql-server-a-guide/
• Disciplined ordering of object access• Unit of Work Pattern
• Martin Fowler• http://martinfowler.com/eaaCatalog/unitOfWork.html
Other Scenarios• Indexes• Missing indexes• Maintenance• Statistics• NTEXT (etc.) preventing online rebuilds
• http://www.bartread.com/2014/09/17/convert-all-ntext-columns-to-nvarcharmax-sql-server/
• Stored procedures and cached execution plans• WITH RECOMPILE
Questions?E: [email protected]: www.bartread.comB: www.bartread.com/blogT: @bart_readGH: https://github.com/bartread
