q

upgraded one of our servers to sql 2005 SP1 a week ago and we have been troubleshooting performance problems ever since.

so far we have narrowed it down to 2 queries.

this one spikes our 8 900MHz CPU Compaq server to 100% for 10 minutes at a time.

runs in seconds on sql 2000 on much older and slower hardware. sql 2k execution plan is all index seeks on the right indexes and sql 2005 is an index scan on the PK.

MS is saying it's by design, but i've never seen an index scan do this.

they said that they changed the optimizer to do this to avoid stack overflows at high usage.

select ordUidID,ordDtmUpdated,ordDtmCreated,ordUidParentOrder,ordCdeOrderType,ordUidCustomer,ordYnNeedsReview,ordYnCanArchive,ordCdeLEC,ordVchPON,

ordVchVersion,ordCdeTranClass,ordVchTranType,ordVchLastTran,ordTnBTN,ordTnWTN,ordSetSynchronization,ordCdeFinalResult,ordCdeStatus,ordVchFileName,

ordDtmOrdered,ordDtmClosed,ordDteDueDateRequested,ordDteDueDateAssigned,ordDteInstalled,ordIntConnectionUsed,ordVchLastMessage,ordDtmMiscDate0,

ordDtmMiscDate1,ordDtmMiscDate2,ordDtmMiscDate3,ordCdeMiscCode0,ordCdeMiscCode1,ordCdeMiscCode2,ordCdeMiscCode3,ordVchMiscData0,ordVchMiscData1,

ordVchMiscData2,ordVchMiscData3,ordVchMiscData4,ordVchMiscData5,ordVchMiscData6,ordVchMiscData7,ordVchUserID,ordCdeUserType,ordUIDIncidentID,

ordVchIncidentType,ordIntRecordUpdateCount,ordIntRecordProcessedCount,ordVchSubTrans,ordUidResellerId from tblLECOrder where ( ordTnBTN in ('000WLK0000','2122283937','2122344229','2122810515','2122818210','2122837617','2122858679','2122893175','2123162861','2123693789','2124107190','2124263225',

'2124278119','2125295465','2125343989','2125447195','2125671073','2125677808','2125678098','2125680722','2125683939','2125684463','2125687396','2125687508','

2125689745','2125689820','2126638480','2126784974','2126904871','2127228356','2127243395','2127813907','2127816515','2127817636','2127955370','2127955862',

'2127957834','2129239577','2129270685','2129273060','2129274728','2129275933','2129276137','2129276468','2129276845','2129277476','2129278126','2129279249',

'2129424067','2129873669','2129879069','2152210772','2152280240','2152321190','2152711041','2152882261','2152910690','2152919646','2153240243','2153333119',

'2154235057','2154235142','2154239175','2154239616','2154250293','2154266674','2154267635','2154268312','2154269081','2154271883','2154571323','2154572414','

2154688652','2156340253','2156342734','2157393712','2157441452','3155364195','5162920290','5163331988','5163778609','5164884993','5165055606','5165360859',

'5165381376','5165384630','5165466810','5165617488','5166239609','5168295375','5184894605','5184922523','5184991914','6102688232','6102728614','6102775286',

'6103721456','6103723790','6103724604','6103729470','6103732079','6103732752','6103735651','6103742625','6103754045','6103765831','6103766395','6104324238',

'6104325988','6104327258','6104335863','6104346703','6104372198','6104391609','6104445140','6104448194','6107749810','6108207582','6108612952','6108662412',

'6108697936','6108699214','6109250219','6109250316','6313852195','6314211097','6314231374','6314778227','6314778291','6315491328','6315493804','6315494720',

'6315498235','6316736552','6316738351','6317544591','6318594984','7168530368','7168562635','7182200643','7182201079','7182203949','7182206032','7182206124',

'7182209706','7182252502','7182353598','7182381315','7182383716','7182520828','7182560894','7182630419','7182711657','7182743419','7182770168','7182772714',

'7182774379','7182774726','7182775216','7182930531','7182931421','7182932314','7182934615','7182935547','7182936379','7182936489','7182944188','7182950607',

'7182953419','7182954264','7182955065','7182955913','7182957192','7182957980','7182967315','7183222109','7183287582','7183293615','7183299730','7183330763',

'7183493722','7183533459','7183645849','7183646794','7183647088','7183647571','7183657547','7183664851','7183672666','7183679345','7183780195','7183783144',

'7183784405','7183785086','7183786437','7183795271','7183820524','7183833545','7183860947','7183863787','7183971152','7184100414','7184102691','7184181232',

'7184184534','7184186657','7184188365','7184188485','7184189682','7184244219','7184260613','7184263054','7184297079','7184352078','7184415451','7184431673',

'7184431978','7184438072','7184452145','7184461815','7184531441','7184533981','7184534089','7184538743','7184553469','7184563259','7184563916','7184763834',

'7184865457','7184866489','7184920615','7184922149','7184971269','7184971876','7184975709','7184977375','7185058171','7185196413','7185196550','7185233417',

'7185238042','7185258323','7185263859','7185265019','7185266713','7185271890','7185280091','7185291314','7185339073','7185372582','7185378203','7185381866',

'7185382967','7185383271','7185383694','7185383794','7185385027','7185387693','7185388697','7185389418','7185392568','7185421930','7185423664','7185426571',

'7185427232','7185428637','7185428742','7185428953','7185430852','7185450174','7185470274','7185475970','7185476028','7185478451','7185491560','7185610521',

'7185611519','7185613654','7185615696','7185615863','7185617340','7185618094','7185618219','7185618486','7185621326','7185621640','7185629364','7185629692',

'7185632531','7185633531','7185733564','7185746632','7185844011','7185844746','7185844836','7185881074','7185886683','7185889899','7185890125','7185894623',

'7185896208','7185900541','7185900828','7185904091','7185904858','7185994193','7186090497','7186171937','7186172711','7186205203','7186332470','7186347884',

'7186392938','7186451907','7186472645','7186472713','7186477636','7186521715','7186522908','7186552248','7186558625','7186682396','7186683433','7186686857',

'7186689161','7186689547','7186711542','7186720486','7186721229','7186721434','7186721469','7186721952','7186722551','7186722592','7186722870','7186723055',

'7186723233','7186724169','7186724835','7186724975','7186725062','7186725799','7186725920','7186726040','7186726621','7186726740','7186726948','7186728309',

'7186728420','7186729408','7186729697','7186756401','7186756779','7186756942','7186771445','7186773330','7186777645','7186778437','7186779455','7186800316',

'7186802749','7186803348','7186803405','7186804038','7186805162','7186805387','7186805459','7186805590','7186806846','7186807136','7186808476','7186808816',

'7186810934','7186811454','7186811648','7186812053','7186812065','7186813478','7186814281','7186815360','7186815361','7186815575','7186816570','7186818268',

'7186818325','7186818403','7186819353','7186861065','7186861543','7186862969','7186866117','7186866617','7186866937','7186866947','7186867179','7186867334',

'7186920497','7186922776','7186927257','7186932954','7186937158','7186949409','7186980457','7186980920','7186980940','7186981811','7186984233','7186986257',

'7186986612','7186987684','7186990841','7186990905','7186991184','7186991329','7186992379','7186992734','7186992876','7186994389','7186995289','7186995341',

'7186997162','7186997361','7186999147','7187034172','7187067578','7187068410','7187068465','7187068471','7187141153','7187144035','7187144291','7187146328',

'7187146758','7187146810','7187149845','7187161933','7187161941','7187162663','7187165245','7187165380','7187206825','7187206887','7187207200','7187207345',

'7187207350','7187210139','7187210350','7187210458','7187210608','7187210643','7187210949','7187211269','7187211638','7187211805','7187211810','7187211904',

'7187211938','7187212099','7187212723','7187214662','7187214693','7187214974','7187215018','7187215202','7187215260','7187215726','7187216790','7187217078',

'7187217415','7187217652','7187230780','7187260513','7187261057','7187261364','7187261847','7187262398','7187262519','7187262573','7187262870','7187264887',

'7187265185','7187265424','7187265551','7187266259','7187266489','7187268008','7187271050','7187277766','7187278594','7187280271','7187280664','7187281954',

'7187282837','7187282877','7187283342','7187284730','7187285104','7187285215','7187285669','7187286478','7187287353','7187287542','7187287593','7187287825',

'7187288005','7187288372','7187288686','7187288808','7187290106','7187291778','7187293062','7187293310','7187293841','7187295612','7187295869','7187297627',

'7187299179','7187299911','7187310861','7187312426','7187313202','7187314421','7187317164','7187317694','7187331410','7187331609','7187332806','7187333146',

'7187333536','7187333765','7187334323','7187334420','7187335228','7187337393','7187337642','7187338725','7187382564','7187382750','7187383647','7187384962',

'7187386413','7187387307','7187388430','7187389395','7187393233','7187397938','7187400244','7187400271','7187401751','7187422142','7187424409','7187426079',

'7187429032','7187429353','7187430854','7187431763','7187431944','7187432321','7187432587','7187432612','7187432646','7187433542','7187433646','7187434553',

'7187435268','7187435814','7187436289','7187436603','7187436874','7187437597','7187438465','7187438527','7187439834','7187450063','7187450844','7187451504',

'7187451728','7187451821','7187453029','7187453212','7187453629','7187453861','7187453964','7187454062','7187454287','7187454354','7187454674','7187455407',

'7187455579','7187456854','7187456970','7187457167','7187457320','7187457946','7187458410','7187460042','7187460871','7187460962','7187461205','7187461252',

'7187463048','7187463553','7187464128','7187464172','7187464384','7187465007','7187465669','7187465760','7187466080','7187468291','7187469464','7187473042',

'7187475607','7187476117','7187476139','7187480944','7187481208','7187482091','7187482464','7187483068','7187483147','7187483659','7187483796','7187483952',

'7187485133','7187486602','7187489896','7187520567','7187521815','7187529750','7187568064','7187590580','7187590925','7187591230','7187599425','7187599662',

'7187600238','7187600614','7187600733','7187600849','7187600873','7187601138','7187601334','7187601527','7187601549','7187601895','7187602377','7187602868',

'7187603285','7187603550','7187603876','7187604804','7187604845','7187605728','7187607406','7187607473','7187608939','7187613931','7187614612','7187615683',

'7187615717','7187616184','7187617711','7187618557','7187620539','7187622317','7187625542','7187628146','7187633771','7187635291','7187650203','7187650597',

'7187670343','7187670370','7187671309','7187671376','7187671516','7187672036','7187672363','7187672473','7187672773','7187672896','7187673849','7187674365',

'7187676549','7187679158','7187681055','7187682238','7187682254','7187687428','7187690619','7187690849','7187691545','7187692238','7187692502','7187693026',

'7187693125','7187693569','7187693707','7187693771','7187694311','7187694751','7187697063','7187697380','7187697880','7187698011','7187698379','7187698981',

'7187699471','7187714204','7187719081','7187730463','7187740128','7187762371','7187770041','7187770758','7187771640','7187771692','7187772414','7187772781',

'7187772868','7187773933','7187775504','7187775560','7187775724','7187775866','7187777576','7187780477','7187781954','7187790469','7187790618','7187790847',

'7187790865','7187791095','7187792267','7187792367','7187792948','7187793777','7187793872','7187794198','7187794582','7187794615','7187794960','7187795132',

'7187795222','7187795508','7187796043','7187796415','7187796844','7187797622','7187797681','7187797758','7187797835','7187798578','7187798794','7187798952',

'7187799293','7187820677','7187820716','7187820757','7187821174','7187821493','7187822103','7187822479','7187822492','7187822540','7187822702','7187823024',

'7187823204','7187823405','7187823581','7187823668','7187823989','7187824599','7187824778','7187825558','7187826351','7187826894','7187826983','7187827057',

'7187827815','7187827862','7187828313','7187829749','7187829884','7187830214','7187830643','7187838148','7187841041','7187842714','7187842877','7187860154',

'7187860348','7187861638','7187861863','7187861990','7187863444','7187864397','7187868894','7187870959','7187871492','7187880717','7187883321','7187884417',

'7187887402','7187889092','7187892980','7187895061','7187895240','7187895769','7187923459','7187924158','7187924204','7187926134','7187926760','7187929594',

'7187930707','7187933729','7187935623','7187935874','7187936547','7187939188','7187949210','7187960476','7187962195','7187968979','7187970769','7187971374',

'7187975362','7187983651','7187983994','7187984130','7187984495','7187989773','7188030981','7188031494','7188031811','7188032538','7188032905','7188033271',

'7188033606','7188033753','7188038130','7188050721','7188051083','7188051246','7188051305','7188051359','7188051875','7188054625','7188055706','7188057438',

'7188057519','7188150474','7188159197','7188161327','7188165502','7188167467','7188169894','7188180836','7188200638','7188211316','7188211496','7188211845',

'7188211878','7188211913','7188212220','7188212592','7188213779','7188214285','7188214610','7188214615','7188215109','7188215236','7188215646','7188216180',

'7188216483','7188216485','7188218034','7188218915','7188219076','7188220092','7188222805','7188225839','7188226323','7188230537','7188234855','7188236617',

'7188240437','7188241859','7188245305','7188260628','7188262346','7188263856','7188270971','7188271302','7188272895','7188273061','7188273870','7188274792',

'7188275066','7188275605','7188275716','7188276649','7188277330','7188277350','7188278145','7188278293','7188278323','7188278492','7188280950','7188285516',

'7188285973','7188288197','7188292735','7188293942','7188297135','7188298399','7188299337','7188300715','7188320402','7188321706','7188321916','7188321926',

'7188322075','7188322262','7188323006','7188323319','7188323354','7188324683','7188324870','7188325182','7188326340','7188329048','7188331311','7188331714',

'7188331730','7188331742','7188332505','7188333556','7188333610','7188333736','7188334762','7188336049','7188336374','7188338980','7188346173','7188351089',

'7188352162','7188352666','7188353017','7188354168','7188360337','7188360435','7188360917','7188361221','7188361278','7188361587','7188364811','7188367087',

'7188367642','7188368733','7188369328','7188369418','7188370515','7188371222','7188371429','7188371963','7188372318','7188372461','7188373207','7188374629',

'7188375153','7188375708','7188375788','7188378334','7188378631','7188378678','7188379737','7188379850','7188420088','7188420108','7188420487','7188421012',

'7188421940','7188422392','7188423238','7188423841','7188424418','7188425904','7188426274','7188427455','7188428037','7188428341','7188433641','7188433675',

'7188435308','7188435869','7188436064','7188436720','7188439150','7188451248','7188452660','7188452896','7188453751','7188455377','7188457478','7188458214',

'7188460012','7188460153','7188460335','7188460478','7188460793','7188462324','7188462862','7188463861','7188463905','7188464068','7188464123','7188464589',

'7188464839','7188464912','7188464983','7188465257','7188465355','7188465383','7188465390','7188465479','7188467469','7188467561','7188467943','7188470216',

'7188470403','7188470427','7188471608','7188472683','7188472734','7188472842','7188473326','7188474837','7188475347','7188477441','7188478426','7188478513',

'7188478664','7188478881','7188479756','7188479790','7188479921','7188479966','7188480420','7188481534','7188483836','7188491672','7188491721','7188492080',

'7188492801','7188492812','7188492904','7188494752','7188495512','7188497501','7188499599','7188500283','7188501571','7188502036','7188502046','7188502162','7188502915','7188503409','7188503490','7188506568','7188507608','7188508397','7188510494','7188512384','7188512517','7188512752','7188512775','7188513642','7188513659','7188513966','7188514081','7188514201','7188514567','7188514652','7188514756','7188516488','7188517267','7188520478','7188522314','7188523971','7188524628','7188525619','7188526316','7188527171','7188527903','7188528148','7188530195','7188530207','7188530519','7188531095','7188531825','7188532481','7188533620','7188533809','7188534256','7188534346','7188535269','7188535693','7188535846','7188536243','7188536264','7188536374','7188536626','7188536787','7188537175','7188537215','7188538059','7188538090','7188538206','7188538298','7188538749','7188538787','7188538804','7188538870','7188539238','7188539773','7188540693','7188540809','7188540910','7188540972','7188541032','7188541275','7188541328','7188541434','7188542399','7188543016','7188543290','7188543545','7188543699','7188543961','7188544302','7188544428','7188544567','7188544745','7188546417','7188547687','7188548831','7188549408','7188552037','7188555438','7188560453','7188561870','7188563263','7188566710','7188568218','7188568343','7188568547','7188571368','7188590157','7188592193','7188592547','7188592974','7188593932','7188595748','7188597452','7188597627','7188599351','7188599774','7188600033','7188600721','7188600815','7188601038','7188601292','7188604393','7188604940','7188606172','7188606349','7188606724','7188606919','7188611747','7188611982','7188613718','7188614261','7188618091','7188618488','7188618711','7188619607','7188630365','7188630429','7188630857','7188632954','7188635415','7188636764','7188637062','7188637288','7188637596','7188637637','7188638440','7188639551','7188680267','7188710727','7188710817','7188711820','7188712965','7188713314','7188713874','7188716101','7188716296','7188717109','7188717438','7188718310','7188753424','7188754140','7188757634','7188760654','7188765210','7188765337','7188810912','7188813925','7188818175','7188824340','7188826326','7188841344','7188842157','7188845525','7188860274','7188860707','7188861957','7188862130','7188862730','7188863048','7188865992','7188869528','7188880096','7188889015','7188911470','7188911724','7188912513','7188913924','7188914378','7188914489','7188914526','7188915048','7188915266','7188916510','7188917352','7188918005','7188918473','7188918491','7188919282','7188919420','7188919452','7188920591','7188922806','7188922867','7188925345','7188929381','7188930361','7188930765','7188930769','7188930781','7188931739','7188934587','7188936794','7188936844','7188936920','7188937595','7188937987','7188939204','7188940023','7188940245','7188940583','7188941210','7188942021','7188942576','7188942739','7188944359','7188944923','7188945419','7188945542','7188947098','7188962071','7188964074','7188965090','7188965674','7188968370','7188971265','7188973159','7188973325','7188973396','7188973472','7188973791','7188973798','7188974660','7188974948','7188976532','7188979451','7188980374','7188980469','7188980983','7188981086','7188981279','7188982197','7188982843','7188983040','7188983432','7188983705','7188983752','7188985279','7188985767','7188986009','7188986040','7188986610','7188987079','7188987865','7188988085','7188988198','7188988573','7188988864','7188989665','7188990103','7188990119','7188990156','7188990751','7188991615','7188992085','7188993414','7188994676','7188995413','7188996403','7188997089','7188997463','7188998036','7188998062','7188999089','7188999457','7188999616','7189010817','7189010869','7189010950','7189011842','7189012184','7189013604','7189015201','7189015670','7189040568','7189180251','7189190849','7189191573','7189191811','7189192171','7189192762','7189193202','7189193619','7189195840','7189198817','7189211632','7189213149','7189215906','7189216319','7189221817','7189311472','7189312569','7189314304','7189314578','7189314783','7189315109','7189320273','7189320839','7189321812','7189321813','7189321823','7189323181','7189323583','7189323947','7189324076','7189324711','7189325322','7189325424','7189325629','7189327421','7189329017','7189330115','7189330291','7189333740','7189336140','7189336406','7189337682','7189338394','7189339274','7189339377','7189340348','7189340996','7189341326','7189341345','7189341549','7189342218','7189342516','7189342833','7189342979','7189343378','7189344788','7189346184','7189346884','7189347947','7189348049','7189348614','7189371547','7189371984','7189372573','7189374692','7189376179','7189390029','7189390987','7189391505','7189393244','7189393318','7189395509','7189395651','7189396250','7189396727','7189400327','7189400688','7189401746','7189402512','7189404481','7189404650','7189412860','7189414356','7189414503','7189417093','7189417241','7189422285','7189422525','7189422650','7189430175','7189430196','7189430199','7189430288','7189430314','7189430371','7189430372','7189435996','7189436410','7189437530','7189450538','7189451102','7189451257','7189451832','7189453608','7189453710','7189455023','7189455172','7189455865','7189456189','7189457131','7189457501','7189457510','7189459661','7189459708','7189460560','7189461476','7189462124','7189462189','7189462805','7189463256','7189463486','7189463656','7189464256','7189464494','7189464791','7189466104','7189467038','7189467307','7189468229','7189470546','7189470582','7189470585','7189470597','7189470605','7189470607','7189470613','7189470615','7189470628','7189470642','7189470644','7189470658','7189470669','7189470675','7189470682','7189470698','7189470710','7189470721','7189470727','7189470728','7189470730','7189470732','7189470733','7189470749','7189470751','7189470752','7189470757','7189470758','7189470760','7189470762','7189470767','7189470780','7189470783','7189470786','7189470794','7189470796','7189470797','7189470807','7189470826','7189470828','7189470830','7189470834','7189470838','7189470840','7189470841','7189470843','7189470845','7189470873','7189470876','7189470884','7189470887','7189470889','7189470907','7189470916','7189470925','7189470926','7189470928','7189470932','7189470936','7189470939','7189470957','7189470963','7189470964','7189470969','7189471052','7189471057','7189471058','7189471059','7189471082','7189471098','7189471105','7189471138','7189471145','7189471151','7189471154','7189471244','7189471251','7189471255','7189471261','7189471262','7189471275','7189471278','7189471282','7189471292','7189471328','7189471362','7189471363','7189471364','7189471365','7189471386','7189471392','7189471393','7189471422','7189471433','7189471461','7189471464','7189471491','7189471494','7189471570','7189471606','7189471765','7189485548','7189486706','7189492489','7189494656','7189511069','7189512276','7189512277','7189517838','7189518087','7189518760','7189518884','7189518984','7189519303','7189519836','7189530975','7189560093','7189560231','7189560238','7189560320','7189560503','7189561005','7189561047','7189561048','7189561272','7189561348','7189561556','7189561794','7189562168','7189563981','7189564479','7189564486','7189564528','7189565627','7189565739','7189565788','7189565843','7189566347','7189566542','7189567186','7189567558','7189568321','7189568330','7189568564','7189569490','7189610502','7189612956','7189619150','7189630168','7189630788','7189631570','7189632013','7189632074','7189632976','7189633192','7189633751','7189633822','7189634004','7189639794','7189650315','7189651103','7189651884','7189652083','7189661111','7189662418','7189665849','7189667528','7189687057','7189688964','7189689587','7189690185','7189690885','7189692709','7189693115','7189693601','7189699311','7189721139','7189721219','7189721390','7189721450','7189721459','7189722897','7189722954','7189722960','7189723002','7189723146','7189723182','7189723779','7189723819','7189723829','7189724498','7189724815','7189725504','7189726549','7189727009','7189727643','7189728304','7189792450','7189793350','7189794053','7189794743','7189798380','7189800198','7189800622','7189800792','7189805913','7189811154','7189812789','7189813418','7189815888','7189820166','7189825750','7189827859','7189828035','7189829217','7189831741','7189838329','7189838380','7189841062','7189842845','7189846914','7189848552','7189870577','7189874293','7189875789','7189876222','7189879213','7189879681','7189911639','7189912579','7189913073','7189913094','7189913873','7189915321','7189915984','7189916941','7189918551','7189919151','7189920641','7189920735','7189921121','7189921509','7189921734','7189921834','7189922143','7189923580','7189924081','7189925319','7189925891','7189925905','7189928280','7189929503','7189930243','7189930975','7189933109','7189934464','7189934547','7189934572','7189935734','7189937486','7189944713','7189946524','7189960318','7189960545','7189960549','7189960625','7189960729','7189961235','7189961586','7189962444','7189962713','7189963977','7189964152','7189964676','7189965292','7189965389','7189966035','7189966784','7189967140','7189968101','7189968183','7189968213','7189968741','7189970170','7189971087','7189976952','7189977314','7189979058','7189979624','7189981124','7189982008','7189982855','7189982959','7189986214','7189988389','7189988460','8452259089','8452468943','8452791399','8452925045','8453521785','8453522864','8453523813','8453524211','8453524484','8453527924','8453528034','8453528172','8453562773','8453565029','8453567444','8453580273','8453580760','8453585911','8453712440','8453712620','8453716119','8454250613','8454251421','8454254079','8454254784','8454254854','8454261269','8454262599','8454266457','8454267459','8454291796','8454340773','8454341805','8454344789','8454542436','8454625953','8454837658','8455284094','8455343415','8455616294','8455651283','8455666970','8455690205','8455697032','8455730144','8456213863','8456265009','8456265515','8456271377','8456473742','8456474340','8457271173','8457277745','8457532472','8457866080','8457867348','8457886780','8457916472','8457918483','8457940405','8458964868','8459477094','9142321846','9142351023','9142355342','9142356043','9142378590','9142411651','9142412108','9142412336','9142412908','9142414382','9142421759','9142500167','9142500271','9142500272','9142713418','9142767666','9142767667','9143321390','9143324572','9143324785','9143328172','9143371090','9143472664','9143750640','9143750681','9143752606','9143752878','9143752980','9143755930','9143756064','9143759018','9143761319','9143761966','9143763954','9143765804','9143765899','9143767153','9143769526','9143789171','9143817430','9144222671','9144233363','9144233917','9144234068','9144234593','9144234721','9144234761','9144237450','9144237869','9144725032','9144725297','9144763768','9144764828','9144769317','9144769580','9144769844','9144780514','9144783532','9144785083','9144787557','9144791298','9145240559','9145280867','9145286518','9145762553','9145763182','9145763890','9145763975','9145764004','9145765023','9145765828','9145768225','9145769186','9145919586','9146311708','9146322303','9146324887','9146328092','9146329447','9146331515','9146333927','9146360297','9146541848','9146632612','9146643301','9146650671','9146657046','9146678126','9146684242','9146684762','9146830825','9146841842','9146847041','9146869786','9146901033','9146909817','9146931130','9146931542','9146982426','9146987134','9147090115','9147120857','9147349202','9147362948','9147367630','9147369786','9147371431','9147378154','9147379064','9147382217','9147388319','9147391652','9147398481','9147472024','9147473258','9147477573','9147612357','9147620328','9147623299','9147631377','9147632100','9147693136','9147773590','9147885645','9148332108','9149210097','9149229331','9149237593','9149238364','9149340694','9149342309','9149349245','9149375812','9149379796','9149390280','9149391344','9149399174','9149399237','9149417746','9149447059','9149464715','9149485639','9149492004','9149493137','9149615666','9149629652','9149632051','9149636257','9149650453','9149650712','9149652521','9149653445','9149663621','9149680803','9149682051','9149682130','9149682392','9149684868','9149687023','9149690418','9149690661','9149693021','9149693852','9149695716','9173268901','9174922134','9174929446','9175211440','9175212118','9175212147','9175217228','9175217252','NEW1007818','NEW1009805','NEW1009942','NEW1009946','NEW1010040','NEW1010090') or ordUidCustomer = 277173336)

I have seen similar performance problems in 2005 when using huge lists of IN values in the where clause. I am not able to change the SQL or the length of the list because it is generated by a report writer and I have no control over what the user selects.

Try 2005 SP2 (on a test machine) and see if that helps.
|||

Maybe there could be some performance gains by putting that huge "IN" list into a temporary table, and then indexing the temporary table.

Dan

|||SQL2005 do have performance problem for IN and NOT IN. Here is another thread talking about this issue.

http://forums.microsoft.com/MSDN/ShowPost.aspx?PostID=990564&SiteID=1

You can use left join or right join to implement same behavior with IN and NOT IN. That will improve your query performance.
|||

>>Maybe there could be some performance gains by putting that huge "IN" list into a temporary table, and then indexing the temporary table.<<

This is what I was thinking. I have a query like this but it passes it as a delimited an I run a split function on it like this:

Code Snippet

declare @.listIds varchar(max)
set @.listIds = '1,2,3,4,5,6,7,8,9'

;with digits as(
select 1 as i union all select 2 as i union all select 3 union all
select 4 union all select 5 union all select 6 union all select 7 union all
select 8 union all select 9 union all select 0),

sequence as (
SELECT distinct D1.i + (10*D2.i) + (100*D3.i) + (1000*D4.i) + (10000*D5.i) + (100000*D6.i) as i
FROM digits AS D1, digits AS D2,
digits AS D3,digits as D4, digits as D5, digits as D6
),
list as (
SELECT substring(',' + @.listIds + ',', i + 1,
charindex(',', ',' + @.listIds + ',', i + 1) - i - 1) AS responseActivityWorkId
FROM sequence
WHERE i <= len(',' + @.listIds + ',') - 1
AND substring(',' + @.listIds + ',', i, 1) = ',')
select *
from list

The select * from list would just be replaced by your query with a join to this list CTE, and remove the IN (big old list). Then format the list as 'value,value,value' and go for it. I support 999999 as the max length of the parameter, but just adding a D7 (following the pattern) and you could go even higher. (I would like to do your data, but the rotation around the screen would take me a long time to reformat

If you have CTE performance issues, just put the results of the list query into a temp table, add an index and try that as a join or IN clause. Then it should be as fast as you can get then.

If you would like to read more about the subject of arrays and lists in SQL Server, please try the excellent article: http://www.sommarskog.se/arrays-in-sql-2005.html

|||

they got around this by using temp tables. i tried this on some new 64 bit servers we just bought with 20GB RAM and same result. 100% CPU spike but execution time is around 30 seconds instead of 10 minutes