1. Presenter: Red Devilic Sponsored by SQLViet.com 22/12/2013 SQL SERVER CONFERENCE HCMC 2013 DATABASE TUNING PERFORMANCE OVERVIEW

2. CONTENT Why - When tuning DB Performance Diffirent approaches for Tuning Performance Server Tuning Instance Tuning Objects Tuning SQLs Tuning Q & A

3. WHY – WHEN TUNING DB PERFORMANCE Why Increasing performance Saving resources Reducing risks When Developing Maintaining Having problems

4. DIFFIRENT APPROACHES Solving Problems and releavant components from user feedbacks. Based on alert log From DBA advices Follow Tuning Performance Process

5. DIFFIRENT APPROACHES © Tuning Performance Process Server Instance Object SQL Statements

6. SERVER TUNING Disk CPU RAM Network

7. INSTANCE TUNING Instance vs Database Instance Tuning Processes Memory Buffer Cache Query Cache

8. INSTANCE TUNING © Buffer Cache Buffer Cache Hit Ratio

9. INSTANCE TUNING © Query Cache Kind of requests Dynamic SQL Stored Procedure, Funtion CLR …

10. INSTANCE TUNING © Example SELECT * FROM dbo.Tblxxx WHERE col1 = 1; SELECT * FROM dbo.Tblxxx WHERE col1 = 2; Parameterized Query Dynamic Query SP_EXECUTESQL Rewrite using Stored Procedure

11. INSTANCE TUNING © Dynamic Condition SELECT * FROM tbl WHERE @condition Using WHERE 1 = 1 SELECT * FROM tbl WHERE @condition WHERE (CustomerID = @custid OR @custid IS NULL) AND (DepartmentID = @depid OR @depid IS NULL) Dynamic List SELECT * FROM tbl WHERE col IN (@list) SELECT * FROM tbl WHERE col IN (SELECT col FROM TableFromList(@list))

12. OBJECTS TUNING Tuning Object Database Structure Object Parameter Objects Physical Object Data File Logical Object Table Index

13. OBJECTS TUNING © Physical Object Multi Data Files Separate Data File for Table, Index Reducing auto extent Data File Logical Object FILLFACTOR Kind of Index, Table

14. OBJECTS TUNING © Database Structure Dernormalization Vertical Partitioning Horizontal Partitioning Aggregation Queries

15. SQLS TUNING

16. SQLS TUNING © Identify bad queries

17. SQLS TUNING © Automatic SQL Tuning Advisor 3 rd Software Manual

18. SQLS TUNING © Change Access Methods Rewrite WHERE to use Indexes COMPUTED Column FBI Index Change Index Type Selectivity Order Lookup Operation

19. SQLS TUNING © Change Access Methods Rewrite WHERE to use Indexes COMPUTED Column FBI Index Change Index Type Selectivity Order Lookup Operation

20. SQLS TUNING ©

22. Change Join Type Reduce Order Operators ORDER BY DISTINCT GROUP BY

23. MY APPROACHES Existing System SQL Tuning Object Tuning Instance Tuning Server Tuning

24. MY APPROACHES © New System Server Tuning Instance Tuning Object Tuning SQL Tuning

25. Q & A THANK YOU