Whichtwostatementscorrectlydescribetherelationbetweenadatafileandthelogicaldatabasestructures()A.Anextentcannotspreadacrossdatafiles.B.Asegmentcannotspreadacrossdatafiles.C.Adatafilecanbelongtoonlyonetablespace.D.Adatafilecanhaveonlyonesegmentcreatedinit.
题目
Whichtwostatementscorrectlydescribetherelationbetweenadatafileandthelogicaldatabasestructures()
A.Anextentcannotspreadacrossdatafiles.
B.Asegmentcannotspreadacrossdatafiles.
C.Adatafilecanbelongtoonlyonetablespace.
D.Adatafilecanhaveonlyonesegmentcreatedinit.
E.Adatablockcanspreadacrossmultipledatafilesasitcanconsistofmultipleoperatingsystem（OS）blocks
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参考答案和解析
参考答案：A, C