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Originally Posted by KangaBear
My DB "ISBN" file is corrupted and I would like to delete this data and then run the Extract ISBN Plugin to refresh the data.
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Unfortunately, I don't understand this part. You might want to run Library > Library Maintenance > Check library.
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Originally Posted by KangaBear
How do I delete the existing ISBN Data ?
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Here's how to do it with search & replace:
However, in Calibre 5.15 there will be an option to delete an identifier from the tag browser. It's already available when running from source.
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and should I? Am I correct saying that the "Identifiers" field shows all the publishers of a particular book and I should delete this field data as well before running the plugin?
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You don't
need to. Extract ISBN will overwrite existing ISBNs unless they match.
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Perhaps I should just go back to reading my books!
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Nah, micromanagement of metadata is more fun.