Jane.doe: Created page with "'''File organization''' is an attribute of files that reflects the way records are accessed and transferred to programs from storage (in blocks or Bucket|..."

2019-12-15T00:46:01Z

Created page with "'''File organization''' is an attribute of files that reflects the way records are accessed and transferred to programs from storage (in blocks or Bucket|..."

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'''File organization''' is an attribute of [[File|files]] that reflects the way records are accessed and transferred to programs from storage (in [[Block|blocks]] or [[Bucket|buckets]].

There are three types of file organizations available in OpenVMS:
* [[Sequential File|sequential]]
* [[Relative File|relative]]
* [[Indexed File|indexed]]

If you use the sequential file organization, the multiblock run-time option allows multiple blocks to be transferred during a single I/O operation. Relative files and indexed files use [[Bucket|buckets]] to transfer records. A bucket is a storage structure, consisting of 1 to 63 blocks, used for building and processing relative and indexed files.

Different record access modes are supported by different file organizations:

{| class="wikitable"
! colspan="col" |
! colspan="3" | File Organization
|-
! colspan="col" | Access Mode
! colspan="col" | Sequential
! colspan="col" | Relative
! colspan="col" | Indexed
|-
| [[Sequential File Access|Sequential]]
| Yes
| Yes
| Yes
|-
| [[Random File Access|Random]] by relative record number
| Permitted with fixed-length record format on disk devices only
| Yes
| No
|-
| [[Random File Access|Random]] by key value
| No
| No
| Yes
|-
| [[Random File Access|Random]] by record file access
| Permitted on disk devices only
| Yes
| Yes
| Yes
|}

[[Category:File Organization]]

File Organization - Revision history

Jane.doe: Created page with "'''File organization''' is an attribute of files that reflects the way records are accessed and transferred to programs from storage (in blocks or Bucket|..."