There are three types of file organizations available in OpenVMS:
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 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:
|Random by relative record number||Permitted with fixed-length record format on disk devices only||Yes||No|
|Random by key value||No||No||Yes|
|Random by record file access||Permitted on disk devices only||Yes||Yes||Yes|