Re: unique ascending numbers
This WebDNA talk-list message is from 2003
It keeps the original formatting.
numero = 50219
interpreted = N
texte = I should know this, but I'm curious, what happens to concurrent users when they attempt to append to a database that has an [exclusivelock] on it? Will their appends be made after the [/exclusivelock] is encountered or do they get database is busy error message? What are the chances that their append info is lost because of any delays caused by the [exclusivelock]?GK On 9.5.2003 23:16 Uhr, Joe D'Andrea
wrote:>> Do you have 5.x? If so then use &autonumber=field and you are done, no extra >> processing! > > You don't know that. You can say that it's easier to code for use > mere mortals, but do we know that the processing behind > &autonumber=field is less CPU intensive then a search to find the > maximum value in a field and then adding one to it?Joe,Scott explained it to me that with the autonumber it is more efficient.We have run into problem were only 5 people tried to add a new record. The template was giving each a new ID. Well, it happened that some of them got the same ID.So we have to wrap [exclusivelock] around the search to find the next higher value and then do a append. I think &autonumber=ID is better:-)Sincerely, Nitai Aventaggiato CEO ------------------------------------------------------------- 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/
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I should know this, but I'm curious, what happens to concurrent users when they attempt to append to a database that has an [exclusivelock] on it? Will their appends be made after the [/exclusivelock] is encountered or do they get database is busy error message? What are the chances that their append info is lost because of any delays caused by the [exclusivelock]?GK On 9.5.2003 23:16 Uhr, Joe D'Andrea wrote:>> Do you have 5.x? If so then use &autonumber=field and you are done, no extra >> processing! > > You don't know that. You can say that it's easier to code for use > mere mortals, but do we know that the processing behind > &autonumber=field is less CPU intensive then a search to find the > maximum value in a field and then adding one to it?Joe,Scott explained it to me that with the autonumber it is more efficient.We have run into problem were only 5 people tried to add a new record. The template was giving each a new ID. Well, it happened that some of them got the same ID.So we have to wrap [exclusivelock] around the search to find the next higher value and then do a append. I think &autonumber=ID is better:-)Sincerely, Nitai Aventaggiato CEO ------------------------------------------------------------- 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/
Gary Krockover
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