Record Management Services
Record Management Services (RMS) are procedures in the VMS, RSTS/E, RT-11 and RSX-11M operating systems that programs may call to process files and records within files.[1][2] Its file formats and procedures are similar to of those in some IBM access methods[a] for several of its mainframe computer operating systems[b] and by other vendors for file and record management. VMS RMS is an integral part of the system software; its procedures run in executive mode. (RMS was not initially integrated into RT-11 and RSTS/E, but was available as an added charge "layered product". It was later added to RSTS/E and was a part of its standard documentation set.)
RMS supports four record access methods:
- Sequential Access
- Relative Record Number Access
- Record File Address Access
- Indexed Access
RMS supports four record formats:
- Fixed length
- Variable length
- Variable record length with fixed-length control blocks
- Stream files (records separated by termination characters)
- STREAM: Records terminated by CRLF
- STREAM_CR: Records terminated by CR
- STREAM_LF: Records terminated by LF
Digital provided the File Definition Language (FDL) which could be used to define the structure of an RMS file.[3]
Notes
[edit]- ^
Primarily
- BDAM
- BSAM
- ISAM
- QSAM
- Virtual Storage Access Method (VSAM)
- ^
Primarily
- DOS/360 and successors through z/VSE
- OS/360 and successors through z/OS
- TSS/360 and TSS/370
References
[edit]- ^ VAX-11 Record Management Services Reference Manual (PDF). DEC. February 1979. AA-D031B-TE.
- ^ OpenVMS Record Management Services Reference Manual. June 2002. p. 23. Retrieved 20 November 2017.
- ^ "This URL has been excluded from the Wayback Machine". itec.suny.edu. April 2001. Retrieved 20 August 2023.[permanent dead link]
External links
[edit]- Guide to OpenVMS File Applications
- OpenVMS Record Management Services Reference Manual
- Free BASIC demo programs showing how to use RMS
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