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555obiee Wordpress Com Category Obiee Best Practices

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  pdfcrowd.comopen in browserPRO version Are you a developer? Try out the HTML to PDF API Categories ArticlesABC's of Oracle AIAData ModelDatawarehouse DesignHow BI Evolved!How to Create OBIEERequestHow to Improve DataQuality in a Tight Budget MiscelleaneousMy LinksNQ configOBIEEOBIEE 10.1.3.4 UpgradeOBIEE 10.1.3.4.1 PatchesOBIEE 11 G NicheOBIEE 11gOBIEE Best PracticesOBIEE CacheManagementOBIEE CachingOBIEE ConfigurationOBIEE Datawarehouse Search Blogroll OBIEE Oracle BI Blog,Orace BusinessIntelligenceOracle Real TimeDecisionsWordPress.comWordPress.com BlogWordPress.org __utmxx'),h=l.hash;d.write('')})();utmx( url ,'A/B'); <!–End of Google WebsiteOptimizer Control Script–> Meta RegisterLog in OBIEE Oracle BI Blog –Datawarehousing Strategy, Raj Guthikonda's Oracle BI Musing's   Archive for the ‘OBIEE BestPractices’ Category OBIEE Caching Configuration Posted by Raj Prashant Guthikonda on August 28, 2009 OBIEE Caching Best Practices One of my recent discussions with a colleague on the cachingstrategy for OBIEE resulted in the following Best practices,Oracle BI Server is an Intelligent Query Engine that storesdatabase hits in a cache file, This cache file is stored on the BIserver.OBIEE Architectural Best Practice feature is to implement thecaching mechanism by using the following methodology wherein the configuration tags can be set in optimal fashion asfollows:  Enable : turns caching on/off   Data_Storage_Paths : defines location to store result HOMEOBIEE SIZING“THE FUTURE OF FINANCIAL REPORTING THROUGH THE EYES OF A BUSINESS INTELLIGENCE EVANGELIST”INSIGHT SERIES  pdfcrowd.comopen in browserPRO version Are you a developer? Try out the HTML to PDF API OBIEE GovernorExceeded error & workaroundOBIEE InstallationOBIEE Instance ConfigTagsOBIEE Pivot ChartPercentagesOBIEE PresentationServices Bugs & UpgradeOBIEE ReportsOBIEE SDLCOBIEE SizingOracle BI ReportsOracle BI RequestsOracle Real TimeDecisionsSCD TypesSecuring OBIEE AnswersAdhoc AnalyticsUncategorizedWhen to go for a BIModelling Tool Archives September 2010August 2010September 2009August 2009July 2009 Subscribe Entries (RSS)Comments (RSS)  _ _   files  Metadata_File : defines location for cache metadatafileReplace_Algorithm: for discarding entries if cache fullBuffer_Pool_Size: buffer for caching metadata file  Max_Rows_Per_Cache_Entry : upper limit on rows inresult  Max_Cache_Entry_Size : upper limit on size(#rows*#bytes/row)Max_Cache_Entries: upper limit on #of cached queriesThe Following is an in detail Architectural configurationchanges that can be implemented for OBIEE Caching 1. Parameter: EnableTurns caching on/off Best PracticeSet to YES if you want caching 1. Parameter: Data_Storage_PathsDefines the directory or directories to store cachedresult filesProvide location and capacityDATA_STORAGE_PATHS =“ d:\Oracle BIData\nQSCache” 500 MBLeast-recently-used cache is purged if full capacityBest practiceuse dedicated drive(s): performance andreliabilityuse local disk (not a file share). (Not enforced)capacity should be significantly larger than value  pdfcrowd.comopen in browserPRO version Are you a developer? Try out the HTML to PDF API  of Max_Cache_Entry_SizeCaveats to be kept in mindDisk space must   exist (or bad things willhappen)Capacity of each location must not exceed 4 GB(2 GB before 7.7) 1. Parameter: Replace_AlgorithmAlgorithm used to purge cache entries when the cache is full  “ Full” is either: 1. 1. Max_Cache_Entries have been created 2. Less than Max_Cache_Entry_Size space isavailableRemoves cache entry that has not been accessed for longesttime – not necessarily the oldest “created” cache itemOnly choice is LRU (least-recently-used) 1. Parameter: Buffer_Pool_SizeDefines the amount of memory for caching the cachemetadata file.Parameter does not affect correctness/behavior of cache – purely a performance settingBest practiceDon’t change the default value. No/limited performance gains possible. 1. Parameter: Max_Rows_Per_Cache_EntryDefines upper bound on number of rows in a cachedresult set  pdfcrowd.comopen in browserPRO version Are you a developer? Try out the HTML to PDF API  Prevent large or “runaway” queries from consumingtoo much cacheQuery will run to completion, but if limit exceededresult will not be added to cache – event is not loggedSet value to 0 if no limit is desiredVery large cache files are inefficientstored in single file on disk  No indexes – full sequential scan to accessBest practiceDefine a non-zero value (less than 1,000,000 if  possible)Max_Cache_Entry_Size is best place to definespace limit 1. Parameter: Max_Cache_Entry_SizeDefines limit on  size  (#of bytes) of a cache entryUsed to prevent large cache entries from beingcreated. Query will not be cached if exceeds this limit. No logging of exceeding limit.Size: #of rows times #of bytes/row#of bytes per row calculation:Unicode expansion (2x or 4x multiplier for char and varchar columns)Column alignment overheads Null value representation overheadCache is purged until Max_Cache_Entry_Size bytesare availableBest practiceSet value to at most 10% of cache capacity (of smallest cache director 
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