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haidude
New User
Joined: 11 May 2007
Posts: 10
Location: Mumbai
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| I have faced one interview in this below question.Why 2 databases in a single application(DB2 and Vsam),why not one database(either DB2 or Vsam)? |
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ofer71
Global Moderator
Joined: 27 Dec 2005
Posts: 2358
Location: Israel
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VSAM is not a database; It is an Access Method.
Do you know that DB2 keeps its data in VSAM files?
O. |
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haidude
New User
Joined: 11 May 2007
Posts: 10
Location: Mumbai
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| I am agree with ur post but my question is why most of the Mainfrae application contain Db2 and Vsam,is there any specific reason? |
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expat
Global Moderator
Joined: 14 Mar 2007
Posts: 8797
Location: Welsh Wales
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| Quote: |
VSAM is not a database; It is an Access Method.
Do you know that DB2 keeps its data in VSAM files? |
Another way of putting this, is that VSAM is an access method, a way to access the data, and VSAM structured file can be used to store DB2, IMS, CICS, and more, not only DB2. |
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mkk157
Active User
Joined: 17 May 2006
Posts: 310
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Hi Ofer71
| Quote: |
VSAM is not a database; It is an Access Method.
Do you know that DB2 keeps its data in VSAM files? |
Expact
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| Another way of putting this, is that VSAM is an access method, a way to access the data, and VSAM structured file can be used to store DB2, IMS, CICS, and more, not only DB2. |
Can I know the real time exmples ot situation we use VSAM to store the data. I read this. But I never get a chance to work on VSAM till now. Please clarify my doubt. |
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dick scherrer
Moderator Emeritus
Joined: 23 Nov 2006
Posts: 19244
Location: Inside the Matrix
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Hello,
There are millions of VSAM files around the world that are 10 -25 years old. Actually, in many places, the vsam environment is managed as a database environment - there just is no rdbms.
Many organizations have decided to implement new systems or upgrade older systems to take advantage of database technology. Often these new/upgraded systems still need to interact with existing systems.
If is very common for an application to use both vsam and database in the same code. |
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