Answer / shanky

CHGPF Command:-

You need to Change DDS of Physical file for Changing Fileds
Length. and after det u need to complie it but if you
complie it then u will loose Existing Data of ur File.

So By Using CHGPF Command u can Keep ur Existing Data with
Compilation Of changed fields(DDS).

Answer / vani

i think by using the CHGPF it is possible.if anybody tell
me is it right or wrong

Answer / gautam

As per my understanding,we can not change length of a field
in a physical file using command CHGPF.Using this command
we can change number of records and so on.

If we want to change length of a field then we have to
change its source where we previously defined the size of
the field and then requires a compilation.After compiling it
we delete all logicals based on this physical file then
file is re-build in respective file groups from where
prorams use records.

Please let me know if there is any issues!

Answer / sachin

By Using CHGPF, We can Change Length add New field or
change field Attributes in PF

Answer / abhishek bajpai

Hi All,
Just to elaborate on the above answers..offcourse CHGPF is
correct and we can just press enter on this command and it
modifies the object based on the current DDS keeping the
data intact. But there are a couple of things to be taken
care of in this:
1.> If we are increasing the field lenghts then there is no
problem at all and chgpf runs absolutely fine.
2.> If we are decreasing the field length, then in case of
character field it will give warning as the existing
records might be truncated because of the shortened length.
But in case of numeric field the caommand will fail because
OS400 cannot truncate the existing numeric data and the
command blows up.
3.> If suppose the command is successfully run and the
field length is changed in the PF then there r chances that
the LF wont reflect the change. If in LF Pfile is mentioned
and no fields (that means the whole record format is copied
from PF) then it will reflect the new length. But in case
you have mentioned certain fields in LF then it will keep
on showing the old lenght inspite of the fact that in PF
the lenght is changed. This is because here the field
attributes are copied to LF from the PF when it is compiled
and it keeps on showing that length only.

Thanks
Abhishek Bajpai

Answer / raja

By using CHGPF we can change the field length.

Answer / ramaraju

By using CHGPF comaand we can change the pf attribute size.
And another way is

copy the physical file into another dummy file(for that
use Cpyf)
and change the physical file field length ,compile it
Then again copy the data from dummy file to original file

Answer / abhishek kumar

I agree that we can do this using the command CHGPF but
whether any one can tell which paramter we need to change
in CHGPF?

Answer / manu som

By using CHGPF comaand we can change the pf attribute size.
And another way is

copy the physical file into another dummy file(for that
use Cpyf)
and change the physical file field length ,compile it
Then again copy the data from dummy file to original file

Answer / swapnil sanghai

Hi All,
just wanted to check if it works for PF ( Flat Physiccal
File ). I do not see option for changing the length of
file. Can you please correct me if im wrong .

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