简述Boot Loader的功能。
简述Boot Loader的功能。
相关考题：
WhichstatementistrueaboutloadingdatausingtheconventionalpathofSQL*Loader() A.Redoisnotgeneratedwhileperformingconventionalpathloads.B.OnlyPRIMARYKEY，UNIQUEKEY，andNOTNULLconstraintsarechecked.C.Noexclusivelocksareacquiredwhentheconventionalpathloadsareperformed.D.Insteadofperformingtransactions，SQL*Loaderdirectlywritesdatablockstothedatafiles.E.INSERTtriggersaredisabledbeforetheconventionalpathloadandreenabledattheendoftheload
ExaminethefollowingstatementthatisusedtomodifytheprimarykeyconstraintontheSALEStable:SQLALTERTABLESALESMODIFYCONSTRAINTpkDISABLEVALIDATE;Whichthreestatementsaretrueregardingtheabovecommand() A.Theconstraintremainsvalid.B.Theindexontheconstraintisdropped.C.ItallowstheloadingofdataintothetableusingSQL*Loader.D.Newdataconformstotheconstraint，butexistingdataisnotchecked.E.ItallowsthedatamanipulationonthetableusingINSERT/UPDATE/DELETESQLstatements.
What is the name of the file that identifies the set of available locale definitions?() A. locale.defB. lxdef.oraC. lx1boot.nlbD. lx1boot.oraE. lang.def
ExaminethefollowingstatementthatisusedtomodifytheconstraintontheSALEStable:SQLALTERTABLESALESMODIFYCONSTRAINTpkDISABLEVALIDATE;Whichthreestatementsaretrueregardingtheabovecommand() A.Theconstraintremainsvalid.B.Theindexontheconstraintisdropped.C.ItallowstheloadingofdataintothetableusingSQL*Loader.D.Newdataconformstotheconstraint，butexistingdataisnotcheckedE.ItallowsthedatamanipulationonthetableusingINSERT/UPDATE/DELETESQLstatements.
When performing password recovery, which command should be entered at the boot prompt?() A.boot -sB.boot -rC.boot singleD.boot recovery
ForwhichtwotaskswoulditbebestNOTtousetheutilitySQL*Loader?() A.Whenloadingselectedrowsintoeachtable.B.Whenloadingdatafromanexportdumpfile.C.Whenloadingdatafromdisk，tape，ornamedpipes.D.WhenyourdataisNOTbeinginsertedfromaflatfile.E.Whenusingarecordmanagementsystemtoaccessdatafiles.
U-Boot编译完成后，可以得到U-BOOT多种格式的映像文件，其中U-Boot.bin是（）A．U-BOOT映像的符号表B．U-BOOT映像的ELF格式C．U-BOOT映像原始的二进制格式D．U-BOOT映像的S-Record格式