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Way,,,too,,,much,,,stats,,,all,,,over,,,the,,,place.,,,I,,would,,also,,add,,proper,,table,,partitioning,,to,,the,,golden,,rules.Reply,,Roland,,Wenzlofsky,,saysFebruary,,10,,,2015,,at,,5:51,,pm,,Yes,,,partitioning,,definitely,,should,,be,,part,,of,,the,,golden,,rules.Regarding,,statistics,,,I,,am,,always,,struggling,,against,,showing,,the,,DIAGNOSTIC,,HELPSTATS,,statement.,,Please,,,try,,,the,,,following:.,,,Here,is,one,example,query,,whichgives,you,detailed,insight,about,how,good,or,bad,each,step,of,your,query,is.In,order,to,be,able,to,run,this,queryyou,need,to,haveselect,accessto,the,DBC.DBQLOGTBL,table.Set,a,different,QUERYBAND,for,each,version,of,the,query,you,are,running:SET,QUERYBAND,=,Version=1;,FOR,SESSION;,SELECT,,AMPCPUTIME,,,(FIRSTRESPTIME-STARTTIME,DAY(2),TO,SECOND(6)),RUNTIME,,,SPOOLUSAGE/1024**3,AS,SPOOLINGB,,,CAST(100-((AMPCPUTIME/(HASHAMP() 1))*100/NULLIFZERO(MAXAMPCPUTIME)),AS,INTEGER),AS,CPUSKEW,,,MAXAMPCPUTIME*(HASHAMP() 1),AS,CPUIMPACT,,,AMPCPUTIME*1000/NULLIFZERO(TOTALIOCOUNT),AS,LHR,FROM,,DBC.DBQLOGTBL,WHERE,,,QUERYBAND,=,Version=1;The,query,will,return:The,total,CPU,UsageThe,Spool,Space,neededThe,LHR,(ratio,between,CPU,and,IO,usage)The,CPU,SkewThe,Skew,Impact,on,the,CPUGoal,is,to,reduce,total,CPU,usage,,consumed,spool,space,and,skew,impact,on,the,CPU.,Method,,Not,,Allowed,,..,,He,,,has,,,more,,,than,,,7,,,years,,,of,,,experience,,,in,,,working,,,with,,,Oracle,,,and,,,Teradata,,,Data,,,Warehouses,,,in,,,the,,,fields,,,of,,,Social,,,Security,,,Data,,,and,,,Banking.,,,

Usually,,I,,sneak,,some,,code,,into,,central,,components,,like,,the,,historization,,process.,,Just,great,stuff.In,order,to,activate,your,subscription,,check,your,email,and,click,on,the,link,in,that,email!,Your,information,will,never,be,shared,with,any,third,party.,Add,them,one,by,one,,and,re-check,the,execution,plan,after,each,change.Several,methods,can,be,used,to,detect,stale,statistics.,English,,Apr.,The,,magic,,of,,the,,DIAGNOSTIC,,often,,results,,in,,shifting,,the,,attention,,away,,from,,more,,fundamental,,design,,problems,,,which,,statistics,,are,,just,,intended,,to,,complete.Great,,post!Reply,,Timm,,saysJanuary,,27,,,2015,,at,,11:51,,am,,Agree,,with,,Remi,,:).,,Roland,,WenzlofskyRoland,,Wenzlofsky,,is,,a,,graduated,,computer,,scientist,,and,,Data,,Warehouse,,professional,,working,,with,,the,,Teradata,,database,,system,,for,,more,,than,,15,,years.,,Most,,performance,,issues,,are,,caused,,either,,by,,query,,steps,,with,,heavy,,skewing,,,or,,by,,a,,badexecution,,plan,,caused,,by,,stale,,and/or,,missing,,statistics.Stale,,and,,missing,,statistics,,typically,,lead,,to,,wrong,,decisions,,in,,join,,preparation,,(copying,,a,,table,,to,,all,,AMPs,,instead,,of,,rehashing),,and,,join,,types,,used,,(product,,join,,instead,,of,,merge,,join).Comparison,,of,,Resource,,UsageAnother,,very,,important,,task,,in,,performance,,optimization,,is,,to,,measure,,the,,resource,,usage,,before,,and,,after,,the,,optimization,,took,,place.,,If,,,you,,,cannotchange,,,the,,,Primary,,,Indexes,,,for,,,whatever,,,reason,,,,or,,,you,,,would,,,need,,,a,,,different,,,Primary,,,Index,,,only,,,for,,,certain,,,SQL,,,statements,,,,use,,,a,,,volatile,,,table,,,or,,,a,,,real,,,temporary,,,table,,,with,,,the,,,same,,,structure,,,and,,,content,,,like,,,the,,,original,,,table,,,but,,,with,,,a,,,different,,,Primary,,,Index.Teradata,,,Indexing,,,TechniquesThe,,,usage,,,of,,,indexes,,,canbe,,,another,,,option,,,to,,,improve,,,the,,,performance,,,of,,,aquery.,,,Share,,the,,explain,,plan,,of,,this,,Query,,for,,more,,detail.Reply,,Leave,,a,,Reply,,Cancel,,replyYour,,email,,address,,will,,not,,be,,published.,,

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