[Info-vax] CRTL and RMS vs SSIO

Arne Vajhøj arne at vajhoej.dk
Sat Oct 9 20:25:16 EDT 2021


On 10/9/2021 7:55 PM, Greg Tinkler wrote:
> As for stream vs not stream, that appears to be a religious type
> issue so we will need to disagree on that.
> 
> As for the original 2 issues from the paper 10 years ago. 1) updating
> a random range of bytes in a file, and loosing some updates Using RMS
> correctly will fix this problem.  It is straight forward to build a
> sample using DCL, of all things, to get and update 2 random fix
> length records on the same disk block by 2 separate process and the
> data not be lost.  This does not loose either updates.

RMS handle this fine for records but not for streams of bytes.

Arne




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