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what is the diferences between dirct access method and indirect access method? in which of them i need to convert external identefier(key) to internel ?and

what is the diferences between dirct access method and indirect access method?

in which of them i need to convert external identefier(key) to internel ?and which of them i can use the same external id as internal? how do they occure in the searching reading and writing ?

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