Re: unique ascending numbers
This WebDNA talk-list message is from 2003
It keeps the original formatting.
numero = 50197
interpreted = N
texte = I also noted doubles in the seriel numbers [cart]. The only method which currently functions without error on our sites, it is to make by program, its own serial number.Le samedi, 10 mai 2003, à 01:33 Europe/Paris, John Peacock a écrit :> Chris List Recipient wrote: >> I would guess that multiple cart numbers generated in the same epoc >> second >> are not necessarily ascending due to the random (not ascending) >> characters >> appended. > > Have you actually observed multiple carts being generated in a single > second or are you SWAG[1]ing? My understanding of what Grant > described about the proprietary cart format was that the subsecond > uniquifiers were an incrementing WebDNA kernal counter. Random number > generation is not sufficient to be demonstratably unique, since the > sequence 1,2,3,4,5,5,5,5,5,4,5,3,2,1 can be considered part of a > random sequence. Additionally, random number generation is typically > very processor intensive (without a hardware RNG), so it is not really > suitable to be doing lots of them when the CPU is already being asked > to handle lots of traffic. > > John > > [1] http://www.netlingo.com/lookup.cfm?term=SWAG > > -- > John Peacock > Director of Information Research and Technology > Rowman & Littlefield Publishing Group > 4720 Boston Way > Lanham, MD 20706 > 301-459-3366 x.5010 > fax 301-429-5747 > > ------------------------------------------------------------- > This message is sent to you because you are subscribed to > the mailing list
. > To unsubscribe, E-mail to: > To switch to the DIGEST mode, E-mail to > > Web Archive of this list is at: http://webdna.smithmicro.com/ > > ------------------------------------------------------------- This message is sent to you because you are subscribed to the mailing list . To unsubscribe, E-mail to: To switch to the DIGEST mode, E-mail to Web Archive of this list is at: http://webdna.smithmicro.com/
Associated Messages, from the most recent to the oldest:
I also noted doubles in the seriel numbers [cart]. The only method which currently functions without error on our sites, it is to make by program, its own serial number.Le samedi, 10 mai 2003, à 01:33 Europe/Paris, John Peacock a écrit :> Chris List Recipient wrote: >> I would guess that multiple cart numbers generated in the same epoc >> second >> are not necessarily ascending due to the random (not ascending) >> characters >> appended. > > Have you actually observed multiple carts being generated in a single > second or are you SWAG[1]ing? My understanding of what Grant > described about the proprietary cart format was that the subsecond > uniquifiers were an incrementing WebDNA kernal counter. Random number > generation is not sufficient to be demonstratably unique, since the > sequence 1,2,3,4,5,5,5,5,5,4,5,3,2,1 can be considered part of a > random sequence. Additionally, random number generation is typically > very processor intensive (without a hardware RNG), so it is not really > suitable to be doing lots of them when the CPU is already being asked > to handle lots of traffic. > > John > > [1] http://www.netlingo.com/lookup.cfm?term=SWAG > > -- > John Peacock > Director of Information Research and Technology > Rowman & Littlefield Publishing Group > 4720 Boston Way > Lanham, MD 20706 > 301-459-3366 x.5010 > fax 301-429-5747 > > ------------------------------------------------------------- > This message is sent to you because you are subscribed to > the mailing list . > To unsubscribe, E-mail to: > To switch to the DIGEST mode, E-mail to > > Web Archive of this list is at: http://webdna.smithmicro.com/ > > ------------------------------------------------------------- This message is sent to you because you are subscribed to the mailing list . To unsubscribe, E-mail to: To switch to the DIGEST mode, E-mail to Web Archive of this list is at: http://webdna.smithmicro.com/
Laurent Bache
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