[evlatests] [evla-sw-discuss] Plans for old monitor data

[Pat Van Buskirk]

fyi - all data from the "older" database are archived and can be 
restored to Oracle if ever needed. You may contact me or Rich Moeser if 
you have need for these data.

Cheers,
Pat


Rob Long wrote:
> I don't see any reason to go to great lengths to save this older data 
> from a maintenance standpoint.  With the overlap between the two, any 
> short-term troubleshooting can still be accomplished.  Any long-term 
> issues (I believe) are minimal.
> 
> Rob Long
> 
> Bill Sahr wrote:
>> Over the next week or so the ECD will be fielding a new monitor data
>> archive and a new query interface that works with that new monitor
>> data archive.  Once the new monitor data archive is created, it will
>> be filled with data from the test version of that archive, so it will
>> go online containing about 4 to 6 weeks worth of old monitor data.
>>
>> The new monitor data archive will be known as evlamcdata.  The old
>> monitor data archive, the one that is being replaced, is known as
>> evlamon.  Evlamon has been with us for some time now.  It contains,
>> or is the means of access to, all EVLA monitor data that has been
>> collected upto this point in time.
>>
>> The question I wish to pose is what should we do with do with this
>> old monitor data?
>>
>> Our present plan is as follows:
>>    For a while, evlamon will continue to exist.  We will even continue
>> filling new monitor data to evlamon for one or two weeks after the new
>> monitor data archive comes into existence.  After that 1 or 2 week
>> period, we will stop filling monitor data to evlamon, but allow it
>> to continue to exist.  It will be accessible via the old monitor data
>> query interface.
>>    After a period of approximately 3 months from the time we stop filling
>> new monitor data to the old monitor data archive, we suggest that
>> 1. the contents of evlamon be archived
>> 2. the actual database, evlamon, be destroyed (i.e. no active, actual
>>     instance of it will exist), and
>> 3. the old query interface disabled
>>
>> It is important to understand that these steps will, without some 
>> considerable amount of effort that we would undertake only with
>> great reluctance, make monitor data predating the rollover to the new 
>> monitor data archive inaccessible.  Barring the mounting of that
>> "considerable effort" the old monitor data would cease to exist and
>> would no longer be accessible.
>>
>> We (the M&C Group in the ECD) want comments on this plan.  If you
>> feel that the loss of basically all monitor data for the EVLA and
>> whatever VLA data may happen to be in the EVLA archive, upto a
>> point in time of approximately the end of May 2007 is unacceptable,
>> please speak up now.  Later will be too late.
>>
>> Please be thoughtful about this matter.  If there really is a need to
>> keep this data and to keep it accessible, we will find a way to do so.
>> However, doing so will require effort, time, energy, money, and
>> resources.  If this data is not really needed, then let's not keep
>> it.  Please let us know what you think, either by a posting to
>> evla-sw-discuss or evlatest, or by direct email to me, bsahr at nrao.edu.
>>
>> Thank you.
>>
>> Bill Sahr
>>
>>
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have only this moment, sparkling like a star in our hand -- and melting 
like a snowflake.

Marie Beynon Ray