Record_Management_Services Knowpia

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]}