Frank Yaeger
Sort Forum Moderator
Joined: 02 Dec 2002
Posts: 1618
Topics: 31
Location: San Jose
|
 Posted: Sat May 03, 2003 10:45 am Post subject: |
 |
|
For DFSORT, CHKPT (or CKPT) activates the Checkpoint/Restart facility. DFSORT will then take checkpoints from which you can restart the job if it fails.
Checkpoint/restart was a good idea in its time, but is really more trouble than its worth for sort these days with large, fast disks available. It's usually better to just rerun a job that fails occasionally then to do checkpoint/restart for that job every time it runs; the amount of time you would save doing a restart for a job that fails occasionally is usually not worth it compared to the amount of time you waste taking the checkpoints for that job all the times it doesn't fail.
In fact, CKPT is NOT supported in DFSORT's primary technique, Blockset. It's only supported in older techniques, and those older techniques do not support important functions such as OUTFIL.
So for DFSORT, we strongly recommend NOT using CKPT.
Our shipped default of IGNCKPT=YES causes CKPT to be ignored when Blockset can be used (which is most of the time). If you want CKPT to be used, you'll need to change the default to IGNCKPT=NO, but we don't recommend that.
_________________
Frank Yaeger - DFSORT Development Team (IBM)
Specialties: JOINKEYS, FINDREP, WHEN=GROUP, ICETOOL, Symbols, Migration
DFSORT is on the Web at:
www.ibm.com/storage/dfsort |
|
FAQ
Search
Quick Manuals
Register
Profile
Log in to check your private messages
Log in
