c - Search in File with Hashmap -

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i working c project. have file containing item details can 5000 - 10000 or more in number. target retrieve item detail item reference.

what create hash values item reference of each item details , store in file.

the location of hash value location of item detail.

whenever item reference, create hash value , search matching 1 in new file of hash values , location. location actual item detail.

this slow process. can suggest more fast method?


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