Re: DDS variable length field

[Vern Hamberg <vhamberg@xxxxxxxxxxx>]

Carel

That's not actually the case. Varying length data is stored in an 
auxiliary data space, not the main data space. For allocated = 0, all of 
the data goes to the aux space. There is a locating value stored in the 
main space, which also has a pointer to the aux space. It's been 10 
years since I looked at this in SST, so the details may be sketchy. If 
allocated > 0, then values that have a length within that value are 
stored in the main space, those longer are stored in toto in the aux space.

There were a couple interesting things as to recovering that aux space 
usage - the only time that happens is when I did a RGZPFM - updates 
don't recover, they just get the pointers changed to where the data is 
now. That's for performance, I always assumed.

Regards
Vern

On 7/20/2012 11:50 AM, Carel Teijgeler wrote:
> A wild guess: the compiler/system has to allocate at least 1 byte fixed
> storage (within the record format) for the field.
>
> Regards,
> Carrel Teijgeler
>
> *********** REPLY SEPARATOR  ***********
>
> On 20-7-2012 at 16:42 Stone, Joel wrote:
>
> > I would like to describe a variable length field with a minimum of zero
> > length.
> >
> > Is this possible?
> >
> > Why must I have min length 1??
> >
> > TEXTDATA     1000          COLHDG('MEMO TEXT')
> >                              VARLEN(1)
> >
> >
> >
> > Editor gives error "Keyword value beginning '0' not allowed."
> >
> >
> >
> >
> >
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