Re: Can I define a variable char field in DDS for a Physical file

Note that performance wise...

If you don't allocate any space, every read or write takes 2 I/Os. One for
the fixed length columns and one for the variable length column(s).

Recommendation is to allocate enough space so that most (80% or higher
ideally) the data in the VARLEN column fits in the allocated space. That
way you only have an extra I/O for the ones that exceed the allocated
length.

So say you want to provide varchar(1024) column for comments. But most
comments are less than 100. Then use
A COMMENT 1024A VARLEN(100).

Charles



On Wed, Sep 13, 2017 at 2:37 PM, Vernon Hamberg <vhamberg@xxxxxxxxxxxxxxx>
wrote:

Sure - there's a keyword for this - VARLEN without parentheses does it.

If you want to specify an allocated-length, put that in parentheses after
VARLEN.

Cheers
Vern


On 9/13/2017 3:25 PM, a4g atl wrote:

If yes, how do I do it?

Always done this is SQL but I need to do it in the PF this time.

TIA

Darryl Freinkel

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