On Wed, 31 Dec 2008 13:56:20 +0200 ??? ?? ??? <[email protected]> wrote:
:>Ive encountered something in Syncsort, and Im looking for an explanation. :>One of our users used Syncsort to copy a dataset. :>The input file had 93386 tracks in 10 extents. :>The output file had 64815 tracks in 2 extents. :>Both files are LRECL=27904 BLKSIZE=27998 RECFM=VB DSNTYPE=LARGE. :>The copy job used Syncsorts SDB=ON option :>Both are allocated on the same type of DASD (3390-54). :>When we say the 30% difference in size we used IEBCOMPR to compare the two file, and the result was that they were identical. :>Another test was done. This time, Syncsort was used to copy records that had a specific value in a specific field. On the large (Input) file, the job ran for 64 seconds. On the small (Output) file the same operation took 7 seconds. :>Can anyone explain this? I would look at the raw input file and see how it was blocked. Perhaps the program that created the file wrote smaller blocks. -- Binyamin Dissen <[email protected]> http://www.dissensoftware.com Director, Dissen Software, Bar & Grill - Israel Should you use the mailblocks package and expect a response from me, you should preauthorize the dissensoftware.com domain. I very rarely bother responding to challenge/response systems, especially those from irresponsible companies. ---------------------------------------------------------------------- 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
