> -----Original Message----- > From: IBM Mainframe Discussion List > [mailto:[EMAIL PROTECTED] On Behalf Of Miklos Szigetvari > Sent: Monday, January 28, 2008 2:10 AM > To: [email protected] > Subject: Keep only the tail of the dataset > > > Hi > > Searching for a method to keep/access only the tail of a dataset. > An application writes internal traces , several million > lines. I would > like to keep only the last part of the trace. > Any simple method to achive this ? > (Currently I can think to pipe under USS , and write a small > program to > wrap around ) > > -- > Miklos Szigetvari
If you want a "wrap around" type log, then I think that the easiest way to do so would be to have a preformatted BDAM or VSAM RRDS dataset. I'd personally go with the RRDS. Have the first record be dedicated to keeping the "next" record number to write. Also, have the maximum record number in there. Now have your subroutine simply increment the record number and wrap around from the max to 1 (skipping 0). You could either update record 0 upon every write (high overhead) or only periodically. I would also keep a timestamp in every record so that you could use SORT to put the records in order. This is about as simple as I can think of off-hand. -- John McKown Senior Systems Programmer HealthMarkets Keeping the Promise of Affordable Coverage Administrative Services Group Information Technology The information contained in this e-mail message may be privileged and/or confidential. It is for intended addressee(s) only. If you are not the intended recipient, you are hereby notified that any disclosure, reproduction, distribution or other use of this communication is strictly prohibited and could, in certain circumstances, be a criminal offense. If you have received this e-mail in error, please notify the sender by reply and delete this message without copying or disclosing it. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
