Www Rittmanmead Com 2012 05 Obiee Performance Tuning Myth Bi

HomeAbout Careers Clients Consulting Training Support Articles Blog OBIEE performance tuning myth : BI Server logging May 22nd, 2012 by Robin Moffatt One of the frequent recommendations around performance in OBIEE that one hears is a blanket insistence on disabling the BI Server log. It is a line that is repeated by Oracle support, propogated in “Best Practice” guides, and repeated throughout blog posts on the subject. Antony Heljula did a talk on the subject at the recent RittmanMead BI Forum in Brighton, and I would like to echo and expand on it here. The Myth: If you are having performance problems in OBIEE, you should switch off BI Server logging The arguments for: 1. 2. 3. 4. Instinct would tell us that writing a log is going to take longer than not writing to a log On a system with high user concurrency, we would expect to see contention for writing to the log file Usage Tracking records report response times, so why do we also need the server logging Log files will cause the disk to fill up, which left uncontrolled could cause system instability The arguments against: 1. If you have performance problems in OBIEE, then you need logging in place to be able to trace and diagnose them. The BI Server log gives us vital information such as what physical SQL results from a logical query from the front end. If you turn off logging, you lose all visibility of query behaviour, timings, and row counts. 2. OBIEE writes lots of logs, more so now in 11g. Why only disable one of them? Why not all logs? 3. If a query takes 30 seconds to run, how much of that 30 seconds is actually going to be in log overhead? You disable logging and now your query runs in 29.999 seconds. It’s still slow, it’s still a performance problem – and now you don’t have the data available with which to diagnose the problem! 4. Usage Tracking doesn’t record the same level of detail around a query’s behaviour (response time profile, row counts) that the server log does. 5. By default, Usage Tracking chops off Logical SQL above 1024 characters in length. 6. Sometimes you need the log file to confirm that Usage Tracking is reporting correctly (especially in circumstances open in browser PRO version Are you a developer? 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Thinking Clearly About Performance.Introduction To a point.The BI Platform Introduction to Oracle BI Cloud Service : Provisioning Data New OTN Article: Making the Move from Oracle Warehouse Builder to Oracle Data Integrator 12c Introduction to the BI Apps 11. In particular. I am being contrary in arguing this specific issue. but it is important with this and other broad-stroke pronouncements around performance that get regurgitating without context and caveats that they are understood. James Morle wrote an great blog post on the subject of “Best Practice” and why it is dangerous terminology. is an excellent starting point for developing an understanding of a logical and methodical approach to performance problem solving. Random Posts If the NFR for a report’s performance is [sub]-second and it is not being met.d install Are you a developer? Try out the HTML to PDF API pdfcrowd. But the point is that it is proven rather than done blindly. New Feature in OEM Cloud Control 12cR3 . entitled “Right Practice” Thoughts on Running OBIEE in the Cloud : Part 1 .Release Overview Tags 11g Big Data Appliance BIP BI Publisher dw em12c Endeca exalytics extremebi git Thanks to Tony for reviewing & making further suggestions for this article. obiee.Exalytics Server Management Further reading Cary Millsap’s paper. linux MDS XML monitoring new features nqcmd OBIA Related Posts: BI Forum 2014 preview – No Silver Bullets : OBIEE Performance in the Real World Advanced Presentation Services settings for OBIEE testing & development Monitoring OBIEE Performance for the End User with JMeter from EM12c Tags: logging.1.1 . nqserver. then profiling of the end-to-end response time breakdown should be done. performance. labelling it a “Best Practice” is a dangerous fallacy as it implies that it should be done without much further thought or consideration of its consequences. Error messages returned from the database are not captured in Usage Tracking It Depends and Obtaining Group Membership from Database Tables Analytics w ith Kibana and Elasticsearch through Hadoop part 1 .where report run times seem unusually high) 7.7. and it might be that it demonstrates that the logging is impeding performance. usage tracking Share obiee odi odi12c opatch Oracle Oracle BI Applications oracle data integrator Oracle Endeca Oracle Endeca Information Discovery ow b performance Real Time 11 open in browser PRO version goldengate hadoop Hive init.log. obiee. Thanks for the post and the effort to test this instead of going “with the flow”. Registered Office : Suite B. nqserver. Call us now to talk about your BI project: +44 (0) 1273 911 268 (UK) or (888) 631-1410 (USA) or +61 3 9596 7186 (Australia & New Zealand) or +91 997 256 7970 (India) or +32 280 882 11 (Belgium) Hom e Services About Us > Consulting > OBIEE Are you a developer? Try out the HTML to PDF API open in browser PRO version Consulting Services Training Resources Blog Authors > Articles > Mark Rittman Rittman Mead Consulting ltd.com . How about using Venkat’s load testing tool to test the impact of logging with 10. 2012 at 10:58 pm Thanks Robin. performance.log. usage tracking ReportService RTD runReport Posted in Oracle BI Suite EE. I had always thought the pros(log) more than out-weigh the cons (no log). 100 etc concurrent users against SampleApp? Mike Neal Says: May 24th. 2012 at 9:52 am Strikes me that this could do with some actual evidence/numbers to back it up. Performance | 2 Comments » security startup testing sampleapp screen scripting training XML Comments Mark Rittman Says: May 22nd. pdfcrowd. But it went for several years that no logging whas the “standard” in Production environments and everyone took it as the “way”.Share Tw eet 11 10 Like 0 Decisions replication Tags: logging. com Website Design & Build: tymedia. 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