7/31/2019 88286470 22 a Interview Questions and Answers

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Q.Hotohandlechangingsourcefilecountsinamapping?

Q.Whatismappingoptimization?watarethetechniquesforthat?

Q.Howtoobtainperformancedataforindividualtransformations?

Q.CanaportinexpressiontransfbegiventhenameDISTINCT?Answer-1:Yes,itcanbeused.Portnameisjustanameandinformaticadonotvalidatetheportnameaslongasitisuniqueamongalltheportsinoneparticularexpression.

Q.WhatisthedifferencebetweenInformatica7.1&informatica8.1?Answer-1:1)powercenterconnectforSAPNetWeaverBWOption2)SQLTransformationisadded3)ServiceOrientedArchitecture4)Gridconceptisadditionalfeature5)Randomfilenamecangenaratationintarget

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6)Commandlineprogramms:Infacmdandinfasetupnewcommandswereadded.7)JavaTransformationisaddedfeature8)concurrentcachecreationandfasterindexbuildingareadditionalfeatureinlookuptransformationAnswer-2:cachesorautomaticudontneedtoallocateattransformationlevel,pushdownoptimizationtechniques,somenewjavatransformations,changesinparameterfileandintigrationservicesratherthanpowercentreserver

Q.Taskisrunningsuccessfullybutdataisnotloaded,Why?Answer-1:EitheryourSQLOverrideisnotreadinganyrecords,oryourupdatestregyisnotusingthecorrectconditionorcheckthetaskSQLOverrideandcheckthepropertiesandmakesure"EnableTestLoad"isturnedoff.

Q.Whatisgalaxyrepository?

Q.Whatismeanbygroupingofconditioncolumninlookuptransformation?Answer-1:groupingofconditioncolummeans-thecolumnswhichwehaveincludedinlookupconditions,thelookupsourceshoulddatashouldbegroupedonthatcolumn.thisismandatoryforflatfiles,otherwisethesessionwillfail

Q.Inreportingweaddsomenewobjects,howwegetthecountofthenewlyaddedobjectstothereport?

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7/31/2019 88286470 22 a Interview Questions and Answers

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Whatismappingparameterandmappingvariable?howdoyousetthatinamapping?Answer-1:Amappingparameterrepresentsaconstantvaluethatyoucandefinebeforerunningasession.Amappingparameterretainsthesamevaluethroughouttheentiresession.Unlikeamappingparameter,amappingvariablerepresentsavaluethatcanchangethroughthesession.ThePowerCenterServersavesthevalueofamappingvariabletotherepositoryattheendofeachsuccessfulsessionrunandusesthatvaluethenexttimeyourunthesession.Answer-2:mappingparameterrepresentsaconstantvalue,udeclearethesevaluesatafileandstoreatalocation,thepathwillbedeclaredatsessionpropertiesandtheparameternameisdecleredatdesigner->parameters&variables---namingconventionis$$-----.whenurunthesessionthenitwilltakethevaluesfromthefilevariables---declearingassameabovebutforparmeterwewildeclearitasparametern4variablewedecleritasvariable---functionalityifudeclareitaslastupdateddateforfirstrunitwilltakeasintialvaluewhichudeclareanditwilsavethatdateandfornextitwildatethatpreviousrunvalue

Q.Howcanugeneratesequenceofvaluesinwhichtargethasmorethan2billionofrecords.(butwithsequencegeneratorucangenerateupto2biliiononly)?Answer-1:byusingunconnectedlookuptransformationucancheckcondtioniecounter>0itwillbeallwaystrue,oryoucanuseoraclesequenceorstoredprocedureAnswer-2:generateasequancevaluesthroughsequesncegeneratorandconnetittothetargetgetthemaxvalueofiteverytimefromunconnectedlookupand

setthisvalue(maxvalue)tomappingvariablesothatthelastmaxvaluewillbestoredinrepository.Oncethesequancegeneratorisreacheditsmaxvaluesay2billion,setthepropertyresetto1so

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thatsequencegeneratorwillstartagaintoproducesequancenumbers.andinexperessionwritethelogiclikenew_seq=max(mapping_variable+sequence_generator(value)thenitislike2million+1...2......(seq_gen)everytimesequancegeneratorwillresetto1afterreachingitsmaxvalue

Q.Howcanuconnectclienttourinformaticaseveriffserverislocatedatdifferentplace(notlocaltotheclient)Answer-1:ThroughIPAddressWhatisupstreamanddownstreamtransformation?Answer-1:SayaTransformation1acceptsinputfromtransformation2andpassestheoutputtoatransformation3,thentransformation2iscalledanupstreamtransformation.transformation3iscalledadownstreamtransformation.

Q.Whataretestinginamappinglevelpleasegivebrifeplanation?Answer-1:VerifyMappingisAvailableVerifyparametersaredefinedproperlywithproperdatatypesVerifywhethertheshorcuttosourcetableisusedassourceinthemappingfromreplicaconnectionVerifywhetherWHEREclauseintheSQhasusedproperlytoimplementdeltaconditionVerifywhethertheprimarykeyisselectedproperlyinthetargettableVerifywhetherversioningismaintainedVerifySourcenameusedinthemappingVerifyTargetnameusedinthemappingChangesmadetotheexistingmapping(ifapplicable)

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7/31/2019 88286470 22 a Interview Questions and Answers

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VerifywhetherthenewfieldshandledforNULLvalues(ifitisaNOTNULLcolumnintheTargettable)Verifywhetherlookupisaddedtothemapping(ifapplicable)VerifywhethertheLookupoverrideusedisproperVefifywhethertheconditionforInsert/UpdateisusedinUPDATESTATERGYtransformationVerifyWhethertheFilterconditionusedisproper

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