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Resolved FYI: Max size for a DW

  1. How-to
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  1. Olan Knight
    Olan Knight
  2. PowerBuilder
  3. Wednesday, 21 July 2021 23:24 PM UTC

PB2019R2, b2703
Windows 10 64 bit platform
Client/Server application
No framework
Small, single PBL utility


We have determined empirically that in our environment, listed above, the max size of a dw_output before it either locks up, or locks up then abends the application, is:
         650,000 rows, from a 210 bytes-per-row input file
                              saved into dw_output defined with 23 columns as follows:

Note:  Several of the columns can be written/appended to during processing, hence their size.
          All input files are 210 bytes per row.




YMMV.   :)  

How can I determine if a directory is empty before...
PB2022 worth the wait?
Accepted Answer
Olan Knight
Olan Knight Accepted Answer Pending Moderation
  1. Monday, 15 August 2022 14:58 PM UTC
  2. PowerBuilder
  3. # Permalink

UPDATE:

I have started using the little utility 4GB_PATCH.EXE pointed out by Aart below, and we migratede to PB2019R3, and between the two the issue was resolved!


PS: we are using a little tool from https://ntcore.com/?page_id=371 to allow our application to use 4GB instead of 2GB of virtual memory. When not using this tool our application crashes a lot more, so that's why we think the crashes are memory related.

Aart Onkenhout

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Olan Knight
  1. Olan Knight
  2. Thursday, 18 August 2022 14:27 PM UTC
There are no restrictions on use listed on the developers site, so my answer is "YES, at this time".
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Roland Smith
  1. Roland Smith
  2. Thursday, 18 August 2022 15:01 PM UTC
Have you tried compiling your app to 64bit?
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Sivaprakash BKR
  1. Sivaprakash BKR
  2. Monday, 22 August 2022 11:36 AM UTC
No. Not yet.
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Responses (4)
Roland Smith
Roland Smith Accepted Answer Pending Moderation
  1. Wednesday, 17 August 2022 18:01 PM UTC
  2. PowerBuilder
  3. # 1

Why not compile the app as 64bit?

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Mickey Hillel
Mickey Hillel Accepted Answer Pending Moderation
  1. Monday, 26 July 2021 08:16 AM UTC
  2. PowerBuilder
  3. # 2

Check out this property for your datawindow.

https://docs.appeon.com/pb2019/datawindow_reference/ch03s03.html#XREF_81831_StoragePageSize

I think that 

dw1.Modify("datawindow.storagepagesize='LARGE'")

should be able to fix the DW limation that you have encountered

regards,
Mickey

 

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Miguel Leeuwe
  1. Miguel Leeuwe
  2. Tuesday, 27 July 2021 06:45 AM UTC
Hi, see: https://www.appeon.com/standardsupport/search/view?id=7001

There's not much difference between LARGE and MEDIUM (and Default), according to Appeon.

regards
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Olan Knight
  1. Olan Knight
  2. Tuesday, 27 July 2021 17:15 PM UTC
Thanks, Mickey! I am testing this now.
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Olan Knight
  1. Olan Knight
  2. Wednesday, 28 July 2021 19:36 PM UTC
Well, this did not seems to make a difference in the processing. The app froze in the same location as it did prior to adding the property. :(



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Miguel Leeuwe
Miguel Leeuwe Accepted Answer Pending Moderation
  1. Thursday, 22 July 2021 08:08 AM UTC
  2. PowerBuilder
  3. # 3

Hi Olan,

It's all about how much RAM you have available. If it's a 32 bit executable or when running from the IDE, your app can only use 2 GB of memory. (there's a way of 'tricking' windows to let it have 3 GB, but that's the max.).

If you have more RAM and you'd build a 64 bit executable, the amount of rows you can retrieve will significantly increase.

regards.

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Chris Pollach @Appeon
  1. Chris Pollach @Appeon
  2. Friday, 23 July 2021 23:17 PM UTC
Hi Olan!

You can try this ...

http://www.windowscentral.com/how-change-virtual-memory-size-windows-10?amp

Regards ... Chris
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Miguel Leeuwe
  1. Miguel Leeuwe
  2. Saturday, 24 July 2021 20:03 PM UTC
Hi Olan, If you are referring to the "3 GB trick", there's this article by Yakow Verde:

https://community.appeon.com/index.php/articles-blogs/tutorials-articles/2-powerbuilder/142-breaking-platform-limitations

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Olan Knight
  1. Olan Knight
  2. Tuesday, 27 July 2021 18:18 PM UTC
Thank you for the tips, guys!
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