[Info-vax] The best VMS features, was: Re: openvms renaming file

[Dave Froble]

On 5/28/2018 2:56 PM, Simon Clubley wrote:
> On 2018-05-28, Dave Froble <davef at tsoft-inc.com> wrote:
>>
>> I don't think so.  RMS indexed files allow concurrent use, using the DLM.
>>
>> The problem with RMS isn't the design, it's the implementation.  Modern
>> RDBMS systems do much of their work in memory.  RMS does the work on
>> disk.  Quite a large difference in speed, as one might expect.
>>
>> Re-implement RMS in the same manner and you'd see totally different
>> performance.  Ya got to remember how old the design and implementation
>> of RMS is.  40 years ago it worked well.
>>
>
> RMS ISAM files would still be very limited compared to a database,
> even MySQL.

Quite right!  RMS and similar worked in the past.  New designs have 
bypassed them.

> For example, compare what is involved in adding a new field to
> a database compared to what is involved in adding that same field
> to a RMS ISAM file.

As one good example.  Nor do I expect that the operation is all that 
simple internally, but, the internal procedures exist.  Any changes to 
strictly record based databases usually require detailed custom work.