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hariibm
New User
Joined: 05 Feb 2007
Posts: 61
Location: Chennai
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Hi,
Please let me know the difference between REUSE and REPLACE options while creating VSAM files.
Thanks,
Hari. |
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expat
Global Moderator
Joined: 14 Mar 2007
Posts: 8797
Location: Welsh Wales
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superk
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Joined: 26 Apr 2004
Posts: 4652
Location: Raleigh, NC, USA
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REUSE:
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REUSE|NOREUSE
Specifies whether or not the cluster can be opened again and again as a reusable cluster.
If REUSE or NOREUSE is specified in the SMS data class, the value defined is used as the data set definition, unless it has been previously defined with an explicitly specified or modeled DEFINE attribute.
REUSE
Specifies that the cluster can be opened again and again as a reusable cluster. When a reusable cluster is opened, its high-used RBA is set to zero if you open it with an access control block that specifies the RESET attribute.
REUSE lets you create an entry-sequenced, key-sequenced, or relative record work file.
When you create a reusable cluster, you cannot build an alternate index to support it. Also, you cannot create a reusable cluster with key ranges (see the KEYRANGE parameter). Reusable data sets can be multivolume and can have up to 123 physical extents.
Restriction: If you select REUSE and your command also contains the keyword UNIQUE, you must remove the UNIQUE keyword or the DEFINE command will be unsuccessful.
Abbreviation: RUS
NOREUSE
Indicates that the cluster cannot be opened again as a new cluster.
Abbreviation: NRUS
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Don't see anything for a REPLACE option. |
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William Thompson
Global Moderator
Joined: 18 Nov 2006
Posts: 3156
Location: Tucson AZ
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Reuse and Replace are common to the Repro command.
Replace controls the replacement of individual keyed records.
Reuse controls the replacement of the entire dataset. |
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