Downloaded 115 times
Uploaded byTexas Memory Systems, and IBM Company
Beyond Tuning: Getting the most out of your Oracle Application
The document discusses strategies for optimizing Oracle applications beyond traditional tuning methods such as indexing and partitioning when performance issues persist. It emphasizes the importance of evaluating and possibly replacing the I/O subsystem, detailing various types of storage architectures and their pros and cons. The conclusion highlights the future shift towards pure SSD solutions for high performance and low latency in storage systems.
More Related Content
Similar to Beyond Tuning: Getting the most out of your Oracle Application
![5G Explained! A High Level Overview [Introduction]](https://cdn.slidesharecdn.com/ss_thumbnails/5gexplainedahighleveloverview-260119165306-cc137a3e-thumbnail.jpg?width=640&height=640&fit=bounds)
Beyond Tuning: Getting the most out of your Oracle Application
- 1. Beyond Tuning: Getting themost out of your Oracle application Mike Ault, Oracle Guru, TMS Inc. Texas Memory Systems, Inc. - The World's Fastest Storage®
- 2. Michael R. Ault Oracle Guru - Nuclear Navy 6 years - Nuclear Chemist/Programmer 10 years - Kennedy Western University Graduate - Bachelors Degree Computer Science - Certified in all Oracle Versions Since 6 - Oracle DBA, author, since 1990 Texas Memory Systems, Inc. - The World's Fastest Storage®
- 3. Books by MichaelR. Ault Texas Memory Systems, Inc. - The World's Fastest Storage®
- 4. Statspackanalyzer.com Free Statspack/AWR Analysis Sponsored by Texas Memory Systems -Looks for IO bottlenecks and other configuration issues. -Straightforward tuning advice Texas Memory Systems, Inc. - The World's Fastest Storage®
- 5. Introduction Ok, You’ve Tuned: • Indexes • Partitioning • Parallel Query • Memory areas • Sort and Hash areas • OS • Bandwidth But…Performance is still not satisfactory! Texas Memory Systems, Inc. - The World's Fastest Storage®
- 6. Introduction • What now? •Tune or replace IO subsystem? Texas Memory Systems, Inc. - The World's Fastest Storage®
- 7. What Now? • Ifyou don’t have CPU or Memory Issues • If you don’t have SQL tuning issues – Or, can’t tune due to third party issues – Or, can’t use automatic Oracle tuning – Or, automatic tuning still results in IO stress • Look at supplementing or replacing IO subsystem. Texas Memory Systems, Inc. - The World's Fastest Storage®
- 8. Basic IO Subsystems •JBOD – Just a Bunch of Disks • Basic SAN – Stripe and Mirror or RAID5 • Advanced SAN – Basic SAN plus cache, plus hot blocking • Advanced SAN + SSD – Tiered approach with hot files on SSD or SSD as advanced caching • Pure SSD – either DDR+Flash or Pure Flash Texas Memory Systems, Inc. - The World's Fastest Storage®
- 9. Problems with Striping •Most JBOD or SAN will be fronted by a RAID controller or software such as ASM • Stripe widths are limited to 64k in most controllers • ASM uses 1 megabyte • Small stripe widths cause IO blocking Texas Memory Systems, Inc. - The World's Fastest Storage®
- 10. IO Blocking Texas MemorySystems, Inc. - The World's Fastest Storage®
- 11. Non-Blocking Texas Memory Systems,Inc. - The World's Fastest Storage®
- 12. So…. • Maximize bandwidth – More HBAs – Infiniband – Most SANs can’t utilize existing bandwidth due to disk limits • Use luns to map hot/cold disk areas (11g ASM does this) • Tune RAID set stripe depth to IO size • Tune to max expected IO size • Reduces blocking reads and writes – Oracle says it doesn’t block reads – This is internal to Oracle once block is in cache – Blocking reads are due to physical issues with disk Texas Memory Systems, Inc. - The World's Fastest Storage®
- 13. What causes blocking? RotationalLatency Armature Motion (positional) Latency Texas Memory Systems, Inc. - The World's Fastest Storage®
- 14. Other IO Issues •Redo log issues – Solve by moving or isolating redo logs • Archive issues – Improve tuning of archive location • Network or Storage Network • Faster IO in archive location • Temporary Issues – Tune sorts, GTT, Bitmap, etc. – Move temp areas to lower latency write IO Texas Memory Systems, Inc. - The World's Fastest Storage®
- 15. How do Itell if My System has Issues? • OEM, AWR or Statspack – Top waits are IO related (DB file, Log) – Average latencies in Tablespoace IO area are >5-10 ms – Average latencies are 2-5 ms and IO waits dominate wait profile Texas Memory Systems, Inc. - The World's Fastest Storage®
- 16. How do SANsOvercome These Forms of Latency? • More disks – May not help latency • Caching into Flash or DDR – Good until cache is flooded • Selective files (hot) moved to Flash • Hot blocks moved to faster portions of disk – still limited to 2-5 ms Texas Memory Systems, Inc. - The World's Fastest Storage®
- 17. What are thePros and Cons? • JBOD – Pros • Easy to implement • Easy to add capacity – Cons • Difficult to manage • Requires third party or OS tools • Doesn’t handle hot blocks/files • Latency issues • Bandwidth issues Texas Memory Systems, Inc. - The World's Fastest Storage®
- 18. What are thePros and Cons? • Simple SAN – Pros • Easy to manage • Easy to expand – Cons • Requires licenses for management software • Doesn’t address hot blocks/files • Still has latency issues • Bandwidth issues Texas Memory Systems, Inc. - The World's Fastest Storage®
- 19. What are thePros and Cons? • Advanced SAN – Pros • Relatively easy to manage • Handles hot blocks/files – Cons • Expensive • Expensive to expand • Licensing of software and support costs • Still has latency issues • Still has bandwidth issues Texas Memory Systems, Inc. - The World's Fastest Storage®
- 20. What are thePros and Cons? • Advanced SAN with Caching – Pros • Easy to manage • Handles hot blocking/files • Provides some relief from latency issues – Cons • Once cache is flooded has latency issues • Expensive to implement and expand • Licensing of software • May have bandwidth issues Texas Memory Systems, Inc. - The World's Fastest Storage®
- 21. What are thePros and Cons? • Advanced San with SSD – Pros • Easy to manage • Solves most latency issues up to a point • Solves hot blocking issues – Cons • Expensive to implement and expand • License of software costs • Usually shoehorns SSDs into existing architecture • Bandwidth issues Texas Memory Systems, Inc. - The World's Fastest Storage®
- 22. What are thePros and Cons? • Mixed DDR and Flash – Pros • Tier solution for hot blocks • Usually has outstanding latency • Usually has great bandwidth • Usually Automatically managed – Cons • Expensive due to DDR • DDR requires battery backup if used as a storage tier • License costs Texas Memory Systems, Inc. - The World's Fastest Storage®
- 23. What are thePros and Cons? • Pure Flash – Pros • Usually doesn’t require tiering • Great Latency • Using eMLC – Lower costs than SLC or DDR • Easily managed • Easily expanded – Cons • More expensive than JBOD, less expensive than Advanced SAN • Needs management software such as ASM Texas Memory Systems, Inc. - The World's Fastest Storage®
- 24. How About someNumbers? IOPS Comparison for Various SANs (Source: www.storageperformance.org) Texas Memory Systems, Inc. - The World's Fastest Storage®
- 25. Looking Forward • You have tuned • You have tuned the existing IO subsystem • Performance is still borderline • How do you determine what system should be next? Texas Memory Systems, Inc. - The World's Fastest Storage®
- 26. Object Intensity •Combines boththroughput and capacity requirements •IOPS/GB •At a high enough IOPS/GB SSD is the cheapest solution •At a low enough IOPS/GB Capacity oriented disk drives meet the performance requirement •In between is performance optimized drives (15K RPM) Texas Memory Systems, Inc. - The World's Fastest Storage®
- 27. Based on performanceAND price per GB SSD Territory Fast HDD Territory Capacity Oriented HDD Territory With eMLC the ratio is now around 1 IOPS/GB or less! Texas Memory Systems, Inc. - The World's Fastest Storage®
- 28. The Adjusted StorageValue Index • Takes into account: – Cost (USD) – Warrantee (years) – Capacity (Terabytes) – Performance (IOPS) – Latency (ms) (not in original SVI) • The higher the number, the better the value Texas Memory Systems, Inc. - The World's Fastest Storage®
- 29. Calculation of ASVI AdjustedStorage Value Index = (TUC*IOPS*WY)/(cost*L) Where: TUC = Total usable capacity in Terabytes IOPS = Validated IOs per second (SPC-1 results for example) WY= Warranty years (or years of paid maintenance if added to cost) Cost = Cost of validated system L = Latency at measured IOPS level Texas Memory Systems, Inc. - The World's Fastest Storage®
- 30. Comparison of StorageValues Adjusted Storage Value Index 20.0000 18.0000 16.0000 14.0000 12.0000 ASVI 10.0000 8.0000 6.0000 4.0000 2.0000 0.0000 d O 0 0 0 ar re 80 0 0 2s r en 40 lla 62 60 50 XI 17 co 3p 6n 67 Pi rtr S5 X8 i2 S3 n ta fo ch 00 Sa N Da D FA ei SU In ta su 87 m aw pp Hi Ra jit ds Hu Fu tA M Ne IB Manufacturer ASVI/Manufacturer All data taken from published SPC-1 Results Texas Memory Systems, Inc. - The World's Fastest Storage®
- 31. Summary • Once allother tuning is done, tune IO • Low latency high bandwidth architectures give the best performance • Almost all advancements in SAN technology are to overcome rotating disk limitations • Pure SSD solutions (at least at the main level) are the future Texas Memory Systems, Inc. - The World's Fastest Storage®