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I need advice in searching very larg key/value records from file  RSS feed

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Thank you for reading my post
I have an application to write , in my application i need to search in a file that contain some sorted key/values (all item are sorted base on their key wich itself is an String) , when user enter its data i should search the file and locate the desiered record , what is best practive to implement this kind of search ?

my files are plain text and key/values are seperate via , .

should i put them in seperate files ?

is it wise to store a hash of Keys and then hash user input to search faster ?

all your suggestions are welcome

Don't get me started about those stupid light bulbs.
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