[Info-vax] VMS Software: New US Mailing Address

[Arne Vajhøj]

On 10/14/2022 8:59 AM, Simon Clubley wrote:
> On 2022-10-14, Arne Vajhøj <arne at vajhoej.dk> wrote:
>> On 10/13/2022 10:05 PM, Richard Maher wrote:
>>>    IIRC Oracle/Rdb is the only RDBMS that executes in the context of the
>>> calling process through DSRI. Sounds pretty efficient. Dynamic qyuery
>>> optimization notwithstanding.
>>
>> There are lots of databases executing in process context:
>> SQLite, Firebird, H2, HSQLDB, good old (or bad old depending on view)
>> Access.
>>
>> Rdb uniqueness is:
>> - it supports both executing in process context (embedded SQL,
>>     SQL modules, JDBC native driver) and executing in separate
>>     server (JDBC thin driver, SQL Services API, ODBC)
>> - even when executing in process context there are still some
>>     central administrative processes running
>> - it is geared towards large usage while traditional embedded
>>     databases are really geared towards small usage or test
>>
> 
> And IIRC, isn't Rdb _fully_ and closely integrated into the VMS cluster
> model with full VMS-style disaster recovery on node/site failures ?

The above list was in relation to separate server vs embedded.

Rdb support active/active-cluster. Other databases do too.
But Rdb is unique in that it used VMS builtin features to
implement it - unlike other that has all the functionality in
the database software itself.

Arne