# AOS

**URL:** <https://techcommunity.softwareag.com/t/aos/76724>\
**Category:** Forum\
**Tags:** Adabas-Natural, Adabas, Adabas-Basics-on-Linux-Unix-Windows, Adabas-on-Windows-UNIX, Adabas-on-Linux\
**Created:** [May 15, 2008, 12:24pm UTC](https://techcommunity.softwareag.com/t/aos/76724 "2008-05-15T12:24:27Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![ROHAN\_LOBO](https://avatars.discourse-cdn.com/v4/letter/r/df705f/32.png) [@ROHAN\_LOBO](https://techcommunity.softwareag.com/u/ROHAN_LOBO)\
**Post date:** [May 15, 2008, 12:24pm UTC](https://techcommunity.softwareag.com/t/aos/76724/1 "2008-05-15T12:24:27Z")

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Hi Folks,

1. Is there any “table” concept in adabas as it is there in db2? Because i read somewhere that option ‘R’ in adabas online system menu can be used to view table of database files. Here we dont have access to open AOS?

2. How i can create FDT and view it?

3. What is a ‘VIEW’ in adabas? how to create or define the ‘view’ and how i can view this ‘view’?

4. What is the difference between ‘DDM’, ‘FDT’ and ‘VIEW’?

Thanks in Advance,  
Rohan.

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**Author:** ![Matthias1](https://avatars.discourse-cdn.com/v4/letter/m/9fc348/32.png) [@Matthias1](https://techcommunity.softwareag.com/u/Matthias1)\
**Post date:** [May 15, 2008, 12:47pm UTC](https://techcommunity.softwareag.com/t/aos/76724/2 "2008-05-15T12:47:58Z")

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> [@ROHAN LOBO](#):
>
> 1. What is a ‘VIEW’ in adabas? how to create or define the ‘view’ and how i can view this ‘view’?

a view has to do with Natural, see your next question…

> [@](#):
>
> 1. What is the difference between ‘DDM’, ‘FDT’ and ‘VIEW’?

A brief (but incomplete) explanation:

FDT = Definition of File layout on ADABAS-Level. Field names are two byte long (e.g. “AB”)  
DDM = Links ADABAS-Fields to logical Natural field names (e.g. “AB” → “CUSTOMER\_NUMBER”)  
VIEW = includes a DDM (or a part of it) into a Natural-Module (e.g. CUST view of CUSTOMER\_FILE)

For more details see the ADABAS/Natural documentation.

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**Author:** ![ROHAN\_LOBO](https://avatars.discourse-cdn.com/v4/letter/r/df705f/32.png) [@ROHAN\_LOBO](https://techcommunity.softwareag.com/u/ROHAN_LOBO)\
**Post date:** [May 15, 2008, 2:28pm UTC](https://techcommunity.softwareag.com/t/aos/76724/3 "2008-05-15T14:28:02Z")

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Thanks a lot for quick reply Matthias…Can you please send me the link where i can find all these information?

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**Author:** ![system](https://global.discourse-cdn.com/techcommunity/original/3X/c/d/cd19967bb605d28a72d77eb83a1cae22f3df2eb8.svg) [@system](https://techcommunity.softwareag.com/u/system)\
**Post date:** [April 2, 2021, 2:49pm UTC](https://techcommunity.softwareag.com/t/aos/76724/4 "2021-04-02T14:49:27Z")

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