Very helpful Stuart (and Brian) thanks. 1 follow-up question: given your algorithm below, when you edit or copy those records over, what does the key look like. E.g. do you have to prefix the key generated by your algorithm, with the part file number or name? To edit the record would you simply:
AE HAIRY.PF.NAME B123456 Or AE HAIRY.PF.NAME 23-B123456 ? 74 & Clear regards from Ft Worth, -Baker -----Original Message----- From: owner-u2-us...@listserver.u2ug.org [mailto:owner-u2-us...@listserver.u2ug.org] On Behalf Of Boydell, Stuart Sent: Wednesday, May 27, 2009 7:34 PM To: u2-users@listserver.u2ug.org Subject: RE: [U2] Best algorithm for UV part files Well, it's a 'how long's a piece of string' type of question but we had a requirement to archive old data from a heavily used file. The file has several indices too many and is in use 24/7 This makes copy/delete a fairly heavy impact on the system and archiving was always an issue. The IDs in the file are a mix of numeric and prefixed keys eg 123456 or B123456 from different systems. We decided that a part file would solve the issue because you can remove the part from the DF and because the indices are attached to the part it's a very quick, clean action. If for some reason you need to put it back - it's also very quick and easy. So, we came up with a part file system which puts 100000 sequential IDs into a part then moves onto the next one. For our requirement numeric keys go in a different part from prefixed keys. Theoretically this makes it easy to archive chunks of data by moving a whole part and also to find specific date ranges for records based on their keys within a particular part. @PART.ALGORITHM = OCONV(@ID,'MCN':@VM:'MR05')[1] + 1;IF @ID MATCH '0N' THEN @1 ELSE @1 + 10 Regards, Stuart Boydell -----Original Message----- Does anyone have an opinion about the best algorithm to use for UV distributed files? The goal is ease of moving the records in the distributed files to other files. ********************************************************************** This email message and any files transmitted with it are confidential and intended solely for the use of addressed recipient(s). If you have received this communication in error, please reply to this e-mail to notify the sender of its incorrect delivery and then delete it and your reply. It is your responsibility to check this email and any attachments for viruses and defects before opening or sending them on. Spotless collects information about you to provide and market our services. For information about use, disclosure and access, see our privacy policy at http://www.spotless.com.au Please consider our environment before printing this email. ********************************************************************** ------- u2-users mailing list u2-users@listserver.u2ug.org To unsubscribe please visit http://listserver.u2ug.org/ This communication, its contents and any file attachments transmitted with it are intended solely for the addressee(s) and may contain confidential proprietary information. Access by any other party without the express written permission of the sender is STRICTLY PROHIBITED. If you have received this communication in error you may not copy, distribute or use the contents, attachments or information in any way. Please destroy it and contact the sender. ------- u2-users mailing list u2-users@listserver.u2ug.org To unsubscribe please visit http://listserver.u2ug.org/
