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[archive] vision 3 files

[Migrated content. Thread originally posted on 29 December 2004]

I have been an acucobol user for many years. In my menu program which calls all other programs I use set environment to use vision 3 files in my application. I am now installing a user of my application whose files will be large. Would I be better off performance wise or for any other reason using a later version of vision?
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RE: [archive] vision 3 files

I'm not aware of any better performance, but if you start getting close to a 2 gig file size you definitely want to consider vision 4. When you hit 2 gig it's an abrupt stop!

Also, if you're under unix you'll want to check your system ulimit also.
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RE: [archive] vision 3 files

On very large files, slow rebuilds might be an issue for you, and I'm not positive, but I think rebuilds are faster in vision 5.
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RE: [archive] vision 3 files

We use VV3 files in order to keep the number of files open to a minimum (VV4+ would open 2 files per FD).

Rob
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RE: [archive] vision 3 files

Mike,
Another option is to keep the majority of your files in vision 3 and just convert the vary large files to visiion 4/5. Vutil utility will let you convert vision versions on a file.
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RE: [archive] vision 3 files

We are using Vision 3 since 1992 and before to change to vision 5 I have made my own performance tests.

With a Windows 2003 server and windows stations ( W2003, 2000, XP ) :
The results are very diff?rents if I am using Network or not and if i am using W(XP/2000/2003) or W98

in some case, using vision 5 files is 50% slower than vision 3 with the same runtime. !!!

I have not yet checked on a Linux or Unix pateforme..

In fact, It seems that the OPEN FILE verb is very the slowest.

I join a Excel sheet with the result ... take a look
PS : You have to rename the file with an xls extension

++
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RE: [archive] vision 3 files

After having discussions with AcuCorp about this same situation, I would recommend staying with VV3 unless you have a need for VV5. In other words, if you don't need any of the feature enhancements that require VV5, then stay with VV3. This seems to be an easy recommendation to give after your performance findings... 😉

When I spoke with AcuCorp about this over the summer, they assured me that there are no plans to discontinue supporting VV3 format.

Rob
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