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.<ref name=DECRMS>Template:Cite manual </ref><ref name=HPRMS1>Template:Cite manual</ref> Its file formats and procedures are similar to of those in some IBM access methodsTemplate:Efn for several of its mainframe computer operating systemsTemplate:Efn 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.<ref name="foldoc">Template:Foldoc</ref> (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.<ref>Template:Cite webTemplate:Dead link</ref>