On Jan 6, 2011, at 9:31 AM, Chris Browne wrote: > The reasonable choices for a would-be artificial primary key seem to be > 1 and 3; in a distributed system, I'd expect to prefer 1, as the time + > host data are likely to eliminate the "oh, it might just randomly match" > problem. In some contexts, 1 is considered a security weakness, as it reveals information about which machine generated it and when, which is why most OS-supplied uuid generators now default to 4 (random). This tends to be more of a concern with encryption/security uses, and if it's not a concern for your db[*], then your are correct that 1 is likely the best choice. [*] After all, in many dbs we log all sorts of explicit where/who/when for auditing purposes. In that case, having ids that provide a clue of where/when most certainly does not add any legitimate security concern. -- Scott Ribe scott_ribe@xxxxxxxxxxxxxxxx http://www.elevated-dev.com/ (303) 722-0567 voice -- Sent via pgsql-general mailing list (pgsql-general@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
