https://faq.appx.com/faq/cache/574.html
FAQ's - APPX Software, Inc.: Do many duplicate keys decrease the performance?
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https://www.csprousers.org/forum/viewtopic.php?t=4016&sid=7c8c26184e92aba160408eda451c3dd4
duplicate keys - CSPro Users Forum
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https://knowledge.exlibrisgroup.com/Aleph/Knowledge_Articles/p_cir_01%3A__%22_cannot_CREATE_UNIQUE_INDEX%3B_duplicate_keys_found%22
p_cir_01: " cannot CREATE UNIQUE INDEX; duplicate keys found" - Ex Libris Knowledge Center
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