Comments on: Logical file update during FTP

By: tomliotta

tomliotta — Thu, 14 Jun 2012 00:34:30 +0000

i have one physical file .it is a flat file which does not contain any header.

I agree this needs a new question. It doesn’t seem related to this thread.

Tom

By: philpl1jb

philpl1jb — Wed, 13 Jun 2012 12:51:00 +0000

Please enter as a new question.

By: gauravkhurana

gauravkhurana — Wed, 13 Jun 2012 09:42:11 +0000

i have one physical file .it is a flat file which does not contain any header.

every day some process with help of FTP replace this flat file data witht he new one.

I need to verify if the files recieved today are of current date.

A cross check to see if FTP was sucessfull.

I built a mechanism based on Retrieving the last change date of the file.

If it iscurrent i am processing the records and doing clrpfm in the end.

I have one problem over here.

If the file recieved is empty on two consecutive day. on the second day the last change date never gets changed as the file was already empty.

due to the fact that i am doing clr[pfm .. for the first time if empty file is recieved it should not change the last change date. but for the first time it is and second day in continuation it is not changing the last change date.

Any bosy can help me out on this?

By: gilly400

gilly400 — Thu, 30 Oct 2008 12:12:59 +0000

Hi,

The object itself hasn’t been changed, only the access path has been updated (or at least should have been) – so the last change date should not have changed.

It looks to me like there’s no easy way to see whether the logical has been updated – I’ve just tried it using DFU on the physical and nothing seemed to change in the object description of the logical or in a DSPFD of the logical.

It seems like the whole process is transparent, so nothing gets visibly updated apart from the physical file.

Regards,

Martin Gilbert.

By: philpl1jb

philpl1jb — Wed, 29 Oct 2008 14:48:16 +0000

Last Change Date did not change. Size did not change. Nothing like I imagined

I don’t know if any would these actually change
Did the logical provide access to the new records
I’m looking at a Logical over a file that has had records added
The last change date doesn’t make sense either
The object size for a logical will also be misleading.
It’s probably created with a lot of “open space” so it can place the new entries without a “collision”.

By: chandlerbing818

chandlerbing818 — Wed, 29 Oct 2008 14:12:54 +0000

Thanks guys.
Actually, I was having the same thought as you guys. But when I setup a trial to FTP a physical file from one partition to another partition, I am quite puzzled.

The logical files has MAINT *IMMED. After the FTP is complete, the logical files seems to be intact. Last Change Date did not change. Size did not change. Nothing like I imagined.

Actually, that is the reason why I post this question, hoping someone can give a logical explanation.

By: gilly400

gilly400 — Tue, 28 Oct 2008 18:53:34 +0000

Hi,

I would say that the above answer is correct. The logicals should be updated at the same time as the related physical, providing that *IMMED is specified on the access path maintenance. This should happen on a record by record basis – the system may cache or block records but the validation (for example checking for duplicate keys) should be carried out per record.

Regards,

Martin Gilbert.