Record Management Services

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Short description: File management processes in OpenVMS operating systems


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[lower-alpha 1] for several of its mainframe computer operating systems[lower-alpha 2] 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.[3] (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.[4]

Notes

  1. ↑ Primarily
  2. ↑ Primarily
    • DOS/360 and successors through z/VSE
    • OS/360 and successors through z/OS
    • TSS/360 and TSS/370

References

  1. ↑ VAX-11 Record Management Services Reference Manual. DEC. February 1979. AA-D031B-TE. http://bitsavers.org/pdf/dec/vax/vms/1.5/3/AA-D031B-TE_VAX-11_Record_Management_Services_Reference_Manual_Feb79.pdf. 
  2. ↑ OpenVMS Record Management Services Reference Manual. June 2002. p. 23. https://support.hpe.com/hpsc/doc/public/display?docId=emr_na-c04623189. Retrieved 20 November 2017. 
  3. ↑ This article is based on material taken from Record+Management+Services at the Free On-line Dictionary of Computing prior to 1 November 2008 and incorporated under the "relicensing" terms of the GFDL, version 1.3 or later.
  4. ↑ "This URL has been excluded from the Wayback Machine.". April 2001. https://www.itec.suny.edu/scsys/vms/ovmsdoc073/v73/6027/6027pro.html. 

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