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The Purge - Clearing out old iterations and releasing my frustrations

avillanueva
22-Sapphire I

The Purge - Clearing out old iterations and releasing my frustrations

thepurge.png

I decided to tackle a large purge job on a single product area. It was way to large to purge in a single shot. The goal was to keep only 2 iterations of Released objects. I estimated there were 120K purgable iterations in just this area. I will paste some graphs and notes at the end but here is what I learned:

  • If too large, try determining a threshold by adjusting the number of iterations to keep and slowly walk that down.
  • Purge Parts and CAD docs together. Too many dependencies to leave out one or the other.
  • Use preview - HTML to get a count of the total number of objects found. I did not want to exceed 11000 items in a single job.  There is a preference to control this. 
  • Chunk - There is a preference that controls how system chunks purge jobs. So a 10000 object job chunked at 1000 objects will create 10 chunks. Chunks are random so if an item needed to purge first is an a later chunk, dependent objects will failed to purge. See here: CS206660 
  • Chunk of -1 will be a complete set. By far the best option to ensure the maximum number of items are purged. I was seeing percent success from 50-80% of objects removed. Using chunk of 500 or 1000 is ok but percent purged dropped to 33%. Successive purges then dropped to around 5 or 6%. You can increase chunk to 3000 but this will increase time for purge to complete often with little increase in success percentages.
  • Eventually I was dropping the number of iterations to keep by 1 but that soon exceeded my max purge job limit.  You may have to skip to a lower iteration number with chunking to get the number of objects lower, then you can return to the previous iteration with chunk of -1 to get the whole set. 
  • Running off hours had better run times but you do not make best use of hours in a day. 

Here is the data:

Desc Iterations Total Purged Chunk Time (mins)
30-P-C 30 2371 1965 -1 47
20-P-C 20 4805 3620 -1 152
15-P-C 15 6871 4962 -1 276
14-P-C 14 3929 1861 -1 301
13-P-C 13 4468 2265 -1 420
12-P-C 12 5047 2260 -1 233
11-P-C 11 5576 3210 -1 378
10-P-C 10 6658 3890 -1 360
9-P-C 9 7735 4716 -1 310
8-P-C 8 9071 5784 -1 495
7-P-C 7 10657 3302 1000 200
6-P-C 6 16564 4965 3000 538
6-P-C(2) 6 11819 568 1000 292
7-P-C(2) 7 6522 3398 -1 313
6-P-C(3) 6 7888 4117 -1 362
5-P-C 5 14951 4629 500 183
5-P-C (2) 5 10434 218 500 183
5-P-C (3) 5 10216 6694 -1 527
4-P-C 4 17873 5810 500 328
4-P-C (2) 4 12258 597 1000 222
2-P-C 2 49060 15745 500 541
4-P-C (3) 4 11545 687 1500 264
4-P-C-(4) 4 10896 7250 -1 666
3-P-C 3 14457 588 500 229
3-P-C (2) 3 13914 1797 500 654
3-P-C (3) 3 12040 956 3000 448
3-P-C (4) 3 11359 311 3000 451
2-P-C (2) 2 23080 1362 3000 542
3-P-C (5) 3 10969 6732 -1 504

purgechart.png 

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