[Info-vax] VMS Software Q1 '23 Update

[Dave Froble]

On 2/3/2023 1:34 PM, Arne Vajhøj wrote:
> On 2/3/2023 12:54 PM, John Dallman wrote:
>> In article <trj153$1epoa$1 at dont-email.me>, arne at vajhoej.dk (Arne Vajhøj)
>> wrote:
>>> Either "enterprise database on OpenVMS" means "PostgreSQL client on
>>> OpenVMS accessing PostgreSQL server on Linux" or he believes
>>> PostgreSQL server on VMS will show up.
>>
>> It is possible for organisations other than VSI to port software.
>
> That is in theory a possibility as well.
>
> I am very skeptical about that being the case here.
>
> I cannot see the PostgreSQL open source community
> spend time on a VMS port.
>
> The VMS port depend on the SSIO thing that VSI will
> need to provide.

 From the little I understand, I've got to say there are options.

PostgreSQL appears to depend upon some numeric range locking that is implemented 
in something (I'm not knowledgeable about such) called SSIO.  But locking can be 
provided in more than one manner.  I've been involved in locking capabilities in 
the past.  It ain't rocket science.

Locking as required by the database could be implemented and the database code 
modified to use the alternate locking provided.  Without SSIO and/or the VMS DLM.

Nor does it need to be VSI that provides the locking capabilities.

That mentioned, the cluster stuff in the VMS DLM would be rather difficult to 
replace, and I'd bet any alternatives would not provide what the DLM does for a 
cluster environment.


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David Froble                       Tel: 724-529-0450
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