HP OpenVMS Systems Documentation
Guide to OpenVMS File Applications
stream record format: Property of a file specifying
that the data in the file is interpreted as a continuous sequence of
bytes, without control information, except for terminators that are
recognized as record separators. Stream record format applies to
sequential files only.
synchronous record operation: An operation in which
your program does not regain control until after the completion of a
record retrieval or storage request. See also asynchronous record
terminator: Special characters or character sequences
used to delimit the records in files using the stream record format.
track: A collection of blocks at a single radius on
one recording surface of a disk.
tuning: The process of designing your files to achieve
better processing performance.
user buffer: A buffer within an application program.
variable-length record format: Property of a file in
which record length may vary.
variable-length with fixed-length control field (VFC) record
format: Property of a file in which records of variable-length
contain an additional fixed-length control field capable of storing
data that may have no connection with the other contents of the record.
VFC record format is not applicable to indexed files.
VFC record format: See variable-length with
fixed-length control field (VFC) record format.
volume (disk): An ordered set of 512-byte blocks. The
medium that carries Files--11 On-Disk Structure files.
volume (magnetic tape): A reel of magnetic tape, which
may contain a part of a file, a complete file, or more than one file.
volume set: A collection of related volumes.
write-behind processing: A software option used for sequentially accessing sequential files using two buffers. One buffer holds records to be written to the disk. The other buffer awaits I/O completion.