I have already found records that are only 28 milliseconds apart and the server isnt really a big one. Its not so much the clock accuracy thats important but the records must be processed in exactly the same order in which they were written to disk. Thanks for the confirmation. It seems there is no other way to do this. Regards, Marco. Wow - what kind of application needs THAT kind of accuracy?!?...B <old man voice> Why I remember when two items writing in the same SECOND was a feat! </old man voice>
In this case, I don't know how you escape having to do a "READVU" on the item, and only writing on the ELSE clause, and changing the key if a THEN or LOCKED happens -- someone else showed using a READV, but you really have to do a READVU to ensure the items are not hitting at EXACTLY the same time. BASE.KEY = KEY SEQCNT = 1 DO.WRITE = 0 LOOP UNTIL DO.WRITE B READVU TESTINGIT FROM FILENAME, KEY, 0 LOCKED B B * No need to wait, Drop To Key Update B END THEN B B * Need a new key, Drop to Key Update B END ELSE B B * Go! B B EXIT B END B * Once here, start adding sequence data... B KEY = BASE.KEY:"*":SEQCNT B SEQCNT += 1 REPEAT WRITE REC ON FILENAME, KEY D3 has a 'System-Wide' Unique ID generator in their SYSTEM() selectiosn... U2 does not.B Darn it. > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of > Marco Manyevere > Sent: Thursday, April 24, 2008 7:47 AM > To: u2-users@listserver.u2ug.org > Subject: Re: [U2] Guaranteed unique sequential keys > > David, Allen, Edward, thanks for the suggestions but I want > to be able to sort theB records in the exact physical order > in which they occured.B Using the port or pid numbers could > potentially give me the wrong sequence should two events > occur within the same millisecond (unless it is ruled out > that this is not possible). > Regards, Marco. ------- u2-users mailing list u2-users@listserver.u2ug.org To unsubscribe please visit http://listserver.u2ug.org/ ___________________________________________________________ Yahoo! For Good. Give and get cool things for free, reduce waste and help our planet. Plus find hidden Yahoo! treasure http://green.yahoo.com/uk/earth-day/ ------- u2-users mailing list u2-users@listserver.u2ug.org To unsubscribe please visit http://listserver.u2ug.org/
