thanks, can this guarentee the uniqueness, previously my boss gave me 8-digits, and when I used Digest::MD5, I got duplicated IDs. 12-digit sounds OK, at least I didn't get duplicated records by testing on 780K sub-records with Digest::SHA1. Is 12-digit enough for 50 Million unique strings ? many thanks

lihao

In reply to Re^2: Question: Generate unique/random 12-digit keys for 25,000K records, howto?? by lihao
in thread Question: Generate unique/random 12-digit keys for 25,000K records, howto?? by lihao

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