What do zen practice and Oracle SQL optimization have in common? You’d be surprised! This presentation demonstrates how the zen principles of simplicity, focus, and practice can be applied to your technical skills to make you a calm and fearless SQL optimizer. You will be “enlightened” as to how to find ease with your day-to-day SQL tuning activities.

1. zen and the art of SQL optimization Karen Morton

4. Simplicity

9. simple vs simple-minded

10. Oracle 9.2.0.6 SELECT to_char( to_date(:B1,‘DD-MON-YYYY’)+1, ‘DD-MON-YYYY’ ) FROM dual;

11. What about its effect?

12. 32.9% % of total R

13. 1,087,770 # of executions

14. 3,263,033 # of LIOs

15. v_date_str := to_char( to_date( :B1,‘DD-MON-YYYY’ ) + 1, ‘ DD-MON-YYYY’ ) ;

16. Focus

17. ETCIBMVIPNASAFBI

18. ETC IBM VIP NASA FBI

19. SELECT rowid, load_no, load_status, manifest_no, manifest_date FROM cs_loads WHERE load_no = 552888 ; VARCHAR2(15) SELECT rowid, load_no, load_status, manifest_no, manifest_date FROM cs_loads WHERE load_no = 552888 ; datatype mismatch causes FULL SCAN SELECT rowid, load_no, load_status, manifest_no, manifest_date FROM cs_loads WHERE load_no =‘552888’;

20. SELECT rowid, load_no, load_status, manifest_no, manifest_date FROM cs_loads WHERE load_no = :B1 ;

21. Keys to Optimizing SQL

22. Tune the question, not the query.

23. What output should the query provide?

24. What special conditions need to be handled?

26. Reduce. Reuse.

27. Decrease row source sizes quickly

28. Access objects once and reuse the result set

29. “ Not enough gets said about the importance of abandoning crap.” - Ira Glass

30. Practice.

31. Never stop learning

32. Stay connected

33. Think in sets

34. Test Test Test (then test again)

37. Going Zen

51. Simplicity is powerful…

52. … but it is neither simple nor easy to achieve.

53. It is obtained through the careful reduction of the nonessential.

54. While simplicity is the goal…

55. … it is possible to be “too simple.”

56. Your job is to find the balance most appropriate to your situation.

57. Thank You

58. http://www.method-r.com http://karenmorton.blogspot.com [email_address]