翻译文献-16 章 库,对象,库列表

外文原文CHAPTER16LIBRARIES,OBJECTS,ANDLIBRARYLISTSOVERVIEWTHEAS/400HASACOMPLEXARCHITECTUREINORDERTOEFFECTIVELYOPERATE,ADMINISTER,ANDPROGRAMTHISMACHINE,YOUNEEDTOUNDERSTANDTHEMAINCONCEPTSABOUTTHISARCHITECTURETHISCHAPTEREXPLAINSTHEMBEFOREYOUSTART,YOUSHOULDKNOWTHATTHEAS/400ARCHITECTUREISDERIVEDFROMTHESYSTEM/38SARCHITECTUREIFYOUAREFAMILIARWITHTHES/38,YOUALREADYKNOWAGREATDEALABOUTTHEAS/400YOUPROBABLYEVENKNOWENOUGHTOBEABLETOSKIPMOSTOFTHISCHAPTERSINGLELEVELSTORAGETHEAS/400ISASINGLELEVELSTORAGEMACHINETOTHEOPERATINGSYSTEM,BOTHMEMORYANDDASDDIRECTACCESSSTORAGEDEVICE,OR“DISK“ARETREATEDTHESAMEWHENAPROGRAMRUNSANDITNEEDSTORETRIEVEAPIECEOFINFORMATION,ALLTHEPROGRAMNEEDSTOKNOWISASINGLEADDRESSTHEOPERATINGSYSTEMUSESTHISADDRESSTORETRIEVETHEINFORMATIONWHETHERITISINMEMORYORDASDINADDITION,THEAS/400DOESNTNEEDTOSTOREANOBJECTINASINGLE,CONTINUOUSSPACEONDASDIFYOUHAVEALARGEFILE,FOREXAMPLE,THEFILEMAYBESPLITINDOZENSORHUNDREDSOFSMALLPIECESANDSPREADACROSSSEVERALPHYSICALDASDUNITSTHEADVANTAGEISIMMEDIATENEITHERTHEOPERATINGSYSTEMNORTHEPERSONWHOUSESTHESYSTEMNEEDSTOWORRYABOUTRESERVINGENOUGHSPACEFOROBJECTSBECAUSETHESYSTEMAUTOMATICALLYUSESWHATEVERSPACEISAVAILABLE,EVENIFTHEPIECESAREMANYANDFARAPARTALONGWITHTHISADVANTAGE,THEREISAPRICETOPAYIFONEOFTHEDASDUNITSBREAKSDOWN,YOUHAVEALONGANDCOMPLICATEDRECOVERYPROCEDUREAHEADOFYOUBECAUSEMANYTHOUSANDSOFOBJECTSCOULDBEAFFECTEDALLTHESEOBJECTSCOULDHAVESMALLSPLINTERSOFTHEIRINFORMATIONINTHEDASDUNITTHATFAILEDANDHAVETHERESTOFTHEIRINFORMATIONINTHEOTHERUNITSCONSEQUENTLY,NONEOFTHEDASDUNITSEXCEPTMAYBEONEORTWO,IFYOUAREINCREDIBLYLUCKYWOULDHAVECOMPLETEANDUSABLEOBJECTSLIBRARIESTHEMOSTIMPORTANTCONCEPTINAS/400ARCHITECTUREISTHATOFALIBRARYALIBRARYISJUSTACONTAINERWITHANAMEINOTHERSYSTEMS,ALIBRARYISCALLEDAFOLDERORADIRECTORYONTHEAS/400,ITISCALLEDALIBRARYLIBRARIESCANCONTAINANYNUMBEROFOBJECTS,BUTTHEYCANNOTCONTAINOTHERLIBRARIESTHEONLYEXCEPTIONTOTHISLIMITATIONISLIBRARYQSYS,WHICHISDISCUSSEDLATERINTHISCHAPTEROBJECTSLIBRARIESCONTAINOBJECTSOBJECTSCOMEINMANYTYPES,DEPENDINGONTHEIRFUNCTIONFOREXAMPLE,THEREAREFILES,PROGRAMS,COMMANDS,JOBQUEUES,MESSAGEQUEUES,DATAAREAS,ANDPANELGROUPSEACHTYPEOFOBJECTHASANOBJECTTYPEIDENTIFIERFILES,FOREXAMPLE,HAVEANOBJECTTYPEIDENTIFIEROFFILEALLIDENTIFIERSBEGINWITHANASTERISK,ANDHAVEASTANDARDABBREVIATIONFOLLOWINGTHEASTERISK,SUCHASPGMFORPROGRAMYOUWILLLEARNMOREABOUTOBJECTTYPESINTHESECTIONABOUTWORKINGWITHOBJECTSOTHERSYSTEMSTORAGELIBRARIESANDOBJECTSARENOTEVERYTHINGTHEAS/400ALSOUSESDASDTOSTORETHESYSTEMMICROCODE,PTFSAPPLIEDTEMPORARILY,SYSTEMVALUES,ANDALLTHEQTEMPLIBRARIESNONEOFTHESEITEMSISSTOREDINANYLIBRARYTHESYSTEMALSOOCCASIONALLYPLACESOBJECTSSUCHASFILESORPROGRAMSOUTSIDEOFANYLIBRARYTHISISANABNORMALSITUATION,BUTITHAPPENSNOWANDTHEN,ANDISCORRECTEDWITHTHERECLAIMSTORAGERCLSTGCOMMANDTHEWORKWITHSYSTEMSTATUSWRKSYSSTSCOMMANDDISPLAYSTHETOTALAMOUNTOFDASDINUSEIFYOUADDUPTHESIZESOFALLTHEOBJECTSINALLTHELIBRARIES,PLUSTHESIZESOFTHELIBRARIESTHEMSELVES,YOUWILLNOTOBTAINTHENUMBERSHOWNBYWRKSYSSTSTHEDIFFERENCEISEQUALTOTHESUMOFALLTHEITEMSTHATAREOUTSIDEOFLIBRARIESIBMLIBRARIESIBMSHIPSAS/400SWITHSOMELIBRARIESALREADYINSTALLEDALLIBMSUPPLIEDLIBRARIESHAVENAMESBEGINNINGWITHTHELETTERQTHEREVERSEALLLIBRARIESTHATHAVENAMESBEGINNINGWITHQAREIBMSISNOTNECESSARILYTRUEBECAUSEYOUCANUSETHECREATELIBRARYCRTLIBCOMMANDTOCREATEAUSERLIBRARYANDGIVEITANYNAMEYOUWANTEVENIFITBEGINSWITHQHOWEVERDONOTGIVEYOUROWNLIBRARIESNAMESBEGINNINGWITHTHELETTERQYOUCANNAMEOBJECTSANYWAYYOUWANTEVENWITHQATTHEBEGINNINGBUTNOTLIBRARIESNEVER,UNDERANYCIRCUMSTANCES,DELETEANIBMSUPPLIEDLIBRARYWITHTHEDELETELIBRARYDLTLIBCOMMANDIFYOUABSOLUTELYHAVETOGETRIDOFONEOFTHEM,YOUSHOULDTREATTHEPROCESSASADEINSTALLATIONOFALICENSEDPROGRAMRUNTHEGOLICPGMCOMMANDTOGETTOTHELICENSEDPROGRAMSMENU,THENSELECTTHEOPTIONTHATDEINSTALLSTHEMTHESYSTEMPRESENTSALISTOFALLLICENSEDPRODUCTSCURRENTLYINSTALLEDENTEROPTION4NEXTTOTHEITEMYOUWANTTODELETEANDPRESSENTERTWICEYOUDONOTNEEDADEDICATEDSYSTEMTOPERFORMTHISTASKTHERESTOFTHISSECTIONCONTAINSABRIEFDESCRIPTIONOFSOMEOFIBMSLIBRARIESQSYSQSYSISTHEMOSTIMPORTANTLIBRARYINTHESYSTEMQSYSCONTAINSOS/400,THEOPERATINGSYSTEM,ANDITALSOCONTAINSALLOTHERLIBRARIESYOUCANNOTOPERATEANAS/400WITHOUTQSYSTHEREARESEVERALTYPESOFOBJECTSTHATCANNOTBEPLACEDANYWHEREBUTINQSYSTHREEEXAMPLESAREUSERPROFILES,DEVICEDESCRIPTIONS,ANDAUTHORIZATIONLISTSQSYSHASANUMBEROFUNUSUALTRAITSYOUCANNOTSAVEITWITHTHESAVELIBRARYSAVLIBCOMMANDORRESTOREWITHTHERESTORELIBRARYRSTLIBCOMMANDYOUCANNOTSAVEANYOFITSOBJECTSWITHTHESAVEOBJECTSAVOBJORSAVECHANGEDOBJECTSSAVCHGOBJCOMMANDCONSEQUENTLY,YOUCANNOTRESTORETHEMWITHRESTOREOBJECTRSTOBJEITHERTIPYOUSHOULDNEVER,UNDERANYCIRCUMSTANCES,DELETEOBJECTSFROMQSYSTHEVARIOUSDELETEDLTXXXCOMMANDSWILLNOTSTOPYOUIFYOUHAVEENOUGHAUTHORITY,BUTTHERESULTCOULDBEDISASTROUSASYOUHAVEREADINTHEPREVIOUSPARAGRAPH,YOUCANNOTSAVEORRESTOREQSYSOBJECTSTHEONLYWAYTOSAVEQSYSISBYRUNNINGTHESAVESYSTEMSAVSYSCOMMANDEXCEPTFORAFEWEXCEPTIONS,YOUCANNOTRESTOREANYQSYSOBJECTSEXCEPTBYRELOADINGTHEENTIREOPERATINGSYSTEMOVERAGAINYOUCANDELETEQSYSOBJECTSONLYIFTHEREARESPECIALIZEDCOMMANDSFORTHATPURPOSEFOREXAMPLE,USERPROFILESALWAYSRESIDEINQSYSYOUCANDELETEUSERPROFILESEVENTHOUGHTHEYAREINQSYSBECAUS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L是所有不但可以被系统也可以被用户使用多次的各对象的集合QGPL包含对象如作业队列,子系统描述,原物理文件和输出队列不要把QGPL与用户对象混乱了不要用QGPL保存你的对象,除非有一个强制性的原因当你创建一个对象是请注意这一点提示很多创建库命令CRTXXX默认库是CURLIB无论是怎么的都是你当前的库但如果你现在还没有创建库,对象默认用QGPL代替DSPLDSPL假脱机库保存个别的系统保存报告和一些等待输出打印的数据库文件这些数据库文件实际上组成系统的假脱机工作提示在任何情况下都不能对这些数据库进行操作甚至是显示它们显示物理文件成员DSPPFM命令锁定那些你正在显示的文件和成员,但系统假工作支持只有在它们解锁后才可以使用它们QDOCOFFICEVISION/400和PCSUPPORT是授权使用文件夹和文档的产品文件夹和文档并不是可以保存在任何地方而必须创建种维护在QDOC库中你不应该用SAVLIB命令来保存QDOC或者用RSTLIB命令来还原系统内置两个QDOC专用的命令保存文档库对象SAVDLO命令还原文档库对象RSTDLO命令不能放任何用户对象到QDOC中PRODUCTLIBRARIES产品库IBM授权的软件产品是独立的软件包每个都包含在分离的库中产品库例如,应用开发工具也叫PDM程序开发管理在QPDA库中RPG/400编译器和帮助文档在QRPG中SPECIALENVIRONMENTS特殊环境AS/400支持SYSTEM/36和SYSTEM/38环境,两个环境都包含在库中S/38保存在QSYS38库中并且包含所有AS/400支持的在S/38系统中使用的所有命令但是某些功能如卡片设备不再得到支持除了QSYS38外,S/38环境可以任意包含3/38授权的程序的库例如RPGIIIS/36环境包包含在几个库中,主要的库是DSSP,它包含S/36SSP程序,工具软件,控制命令各OCL解释程序LIBRARY在S/36中是被支持的,所以你可以把已经在LIBRARY中的用户对象存放到真实的S/36中除了QSSP和LIBRARY,S/36环境中包含QS36FQS36F包含所在环境在使用的数据库文件和其它库的授权程序例如RPGLIB中的RPGIISUPPORT,或者是SDALIB中的S/36SDASUPPORT用户库AS/400除了系统库外,还可以包含任意数量的用户创建的库这些库叫用户库WORKINGWITHL