The document provides a comprehensive guide for developers on T-SQL, query tuning, and best practices for using Entity Framework with Azure SQL Database. It emphasizes the importance of performance and security while offering specific tips on handling LINQ queries and avoiding common pitfalls with migrations. Additionally, it outlines various Azure SQL features and tools that can aid in database management and development.

1. Professional SQL for Developers
Paul Irwin
CTO, Docio
Chief Software Engineer, feature[23]

4. Why?
• ORMs + migrations + cloud = lazy developers
• Lazy developers + high traffic = slow performance
• Lazy developers + bad actors = security breaches
• Slow performance + security breaches = unemployed developers

5. Overview
T-SQL You Need To
Know
Query Tuning
Basics
3 Entity
Framework Tips
Azure SQL
Database Features
Tool
Recommendations

6. T-SQL You Need To Know

7. T-SQL: String Data Types
(N)VARCHAR(X) (N)TEXT (N)VARCHAR(MAX)
Max Length/Size 8000/4000 2GB 2GB
Ease of Use Good Poor Good
Performance Good Poor Good or Poor
Indexable Yes No No
Recommended Yes No Yes

8. T-SQL: OFFSET/FETCH

9. T-SQL: Window Functions
• ROW_NUMBER() OVER (ORDER BY OrderDate DESC)
• ROW_NUMBER() OVER (PARTITION BY TerritoryID ORDER BY OrderDate DESC)
• RANK() OVER (ORDER BY Score DESC)
• DENSE_RANK() OVER (ORDER BY Score DESC)
• SUM(SubTotal) OVER (PARTITION BY TerritoryID ORDER BY SalesOrderID ROWS
UNBOUNDED PRECEDING)

10. T-SQL: Table Valued Parameters

11. T-SQL: MERGE

12. T-SQL: Common Table Expressions

13. T-SQL: XML

14. T-SQL: JSON

15. Query Tuning Basics

16. Query Tuning: Finding Slow Queries
Extended Events (XEvents) Query Store (2016+)

17. Query Tuning: Find Missing Indexes

18. Query Tuning: Missing Index DMVs
http://bit.ly/2rudhX9

19. Query Tuning: Analyzing Query Plans

20. Query Tuning: Statistics
SQL Server Statistics Basics by Robert Sheldon
http://bit.ly/2apoFJO

21. 3 Entity Framework Tips

22. EF Tip #1: Limit LINQ
• Complex LINQ queries:
• Can be hard to tune
• Can be hard to maintain
• Require a code push to change
• Heuristics:
• Limit LINQ to 3-4 simple clauses (from, join, where, select, etc.)
• Anything more complex goes into a sproc

23. EF Tip #2: No Nav Props
• Navigation properties:
• Can cause unexpected lazy loading
• Can cause unexpected NREs
• Can cause more data to be returned than needed
• See previous points about LINQ
• Recommendations:
• Do not use nav props at all (pure POCO, no virtuals)
• OR at least disable lazy-loading by default

24. EF Tip #3: No Code-First Migrations
• Code-first migrations:
• Can’t be verified at compile time
• Can cause git merge issues due to .resx binary data
• Require use of fragile __MigrationHistory table
• Are difficult to use with multiple team members’ local DBs
• Can’t do schema comparison
• Can’t be deployed without running code
• Recommendations:
• Don’t use them at all (use DACPAC instead)
• OR institute very deliberate team process around them

25. Azure SQL Database Features

26. Azure SQL Database: Security
• TLS
• Encrypt=True;TrustServerCertificate=False
• Transparent Data Encryption
• Always Encrypted
• Row-level Security
• Dynamic Data Masking
• Auditing
• Threat Detection
• Security Center

27. Azure SQL Database: Scalability

28. Azure SQL Database: Scalability

29. Azure SQL Database: Geo-Replication

30. Tools

31. SQL Server Data Tools

32. SQL Server Data Tools

33. SQL Server Data Tools

34. EF Reverse POCO Generator
http://bit.ly/2fX7Pql

35. EF SSDT Workflow
Without Reverse POCO Generator
1. Create table/sproc in DB project
2. Publish to local DB
3. Create POCO class, ensure it
matches exactly
4. Add data annotations attributes
as needed
5. Add DbSet to EF context
With Reverse POCO Generator
1. Create table/sproc in DB project
2. Publish to local DB
3. “Run Custom Tool” on .tt file

36. EF Reverse POCO Generator Tips
• ConnectionStringName in app.config
• GenerateSeparateFiles = true;
• ForeignKeyFilter = (ForeignKey fk) => null;

37. SentryOne Plan Explorer
https://www.sentryone.com/plan-explorer/

38. Visual Studio Team Services
• Build your SQL Server Database
Project with Visual Studio Build
• DACPAC file in drop folder
• Deploy to Azure SQL Database

39. Summary

40. Take-Aways
• Learn some T-SQL for fun and profit
• Tune queries early and often
• With Entity Framework, less is more
• Take advantage of cloud security and scalability
• Use tools to help you code, version, tune, and deploy

41. Q&A