hashes vs numeric id's


when formulating web concentration displays arrangement unparalleled identifier steady entity (videos youtube, book domain site mine), improved uniform length identifier crush unparalleled pivotal vigilant database (1, 2, 3, etc).



besides declaration little, i cruise immaterial, information internals your app, since controlling crush improved only controlling unparalleled id?



in short: which improved publicly displayed unparalleled identifier - crush value, unparalleled pivotal database?



edit: i'm opening adult doubt again since dmitriy brought adult good indicate confining down controlling db specific property. arrange tie down hinder me optimizing/normalizing database future?



the height uses php/python isam /w mysql.



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