1. Improving Efficiency of I/O Bound Systems More Memory, Better Caching Newer and Faster Disk Drives Set Object Access (SETOBJACC) Reorganize (RGZPFM) w/ Key File Applications Requesting Less I/O

2. Validate That System Is Actually I/O Bound CPU Is Under Utilized! Poor Interactive Response Time Long Running Batch Jobs High Memory Faulting High Disk Actuator Arm Activity

3. System Navigator

4. Identify Files With Highest Physical I/O Set Object Access (SETOBJACC) Better Blocking of Data Internal Program Arrays Purge Old Transaction History Build Better Logical Files Stop Full Table Scans

5. Physical Reads

6. Tune Database, Avoid Access Path Rebuilds Identify Files Most Heavily Hit Avoid SQL Full Table Scans Limit Access Path Rebuilds Small Tables OK, Large – Not! Basic Database Administration Dramatic Reduction in I/O Needs

7. Access Path Rebuilds

8. Identify Specific Culprits & New Logicals Batch, Interactive or ODBC Specific Jobs and Users Actual I/O by File and Program Skipped Records v.s. Selected New Permanent Logical Files Delete Old Ones Not Being Used

9. Query Optimizer

10. Avoid Simple CL Programming Issues Never CPYF w/ SELECT/OMIT Use OPNQRYF and CPYFRMQRYF Easy Technique, Limit I/O Needs Use RPG, COBOL, SQL, etc.. Prevent I/O From Full Table Scans Work File in QTEMP w/ Keys

11. Copy File Operations

12. Prevent Unnecessary Opens and Closes Leave Files Open, Reuse Paths Simply Move Record Pointer Files Left Open All Day, GOOD! Better Than Constant Opens/Closes Share Open Data Paths Correctly RETRN v.s SETON LR

13. Opens and Closes

14. Identify Specific Job and User Culprits Focus on 80/20 Rule Get Hardware & Software In Sync Database Tuning System Management Changes Application Optimization Changes Hardware Upgrades

15. Workload Navigator

16. Find Specific Operating System Functions QQQIMPLE and QSQROUTE QDBGETSQ v.s. QDBGETKY Trace Back to Application Program Simple Code Changes, No Rewrite Weigh Cost v.s. Benefit Find Quick, Easy Code Fixes

17. Operating System Program

18. Analyze Application Program Efficiency 75% Finding Data, Inefficient! Less Time Searching, Sorting Free Up I/O Bottleneck Allow CPU to be Used Effectively Consume Resource w/ Updates Process Only Selected Transactions

19. Application Program

20. Identify Specific Database File I/O Counts Compare Reads to Writes/Updates Less Time Reading via Indexes Reduce I/O to Only Selected Records Avoid Full Table Scans Prevent Access Path Rebuilds Use Proper Keyed File Sequences

21. Database File

22. Find Procedures within Code Causing Issues Rewrite Just Specific Procedure Summarize Data More Efficiently Use Pre-Summarized Data Tables Avoid Constant Re-Processing Extract Data Once, Reuse Many Process Only “OPEN” Transactions

23. Procedure Name

24. Q&A To receive MB Software’s FREE performance evaluation: 1. Register at http://www.mb-software.com 2. Download and install software on AS/400 or iSeries 3. Call (800) 713-5034 to schedule your free performance review session What To Expect: After allowing performance data to accumulate for one full business day, you will log into a secure area of MB Software’s web site. We will then have a conference call to discuss our findings and how you can gain performance improvements with your existing applications. It’s that easy! Questions & Answers