The last cut and paste didn't make it:
Kay discusses the relationship between PVs, records and names at
http://www.aps.anl.gov/epics/tech-talk/2007/msg00853.php
Don
On 9/14/09 11:18 PM, "Don Dohan" <[email protected]> wrote:
> If you mean the pv crawler used for the IRMIS RDB, the crawler extracts and
> stores both the record name and user defined field type instance values. The
> crawler maintains a link to the dbd file used in defining each record, making
> it possible to reconstruct the full record using both user defined field
> values and default field values.
>
> PVs, however are still something a little different - see Kay Kasemir's
> explanation
>
>
> On 9/14/09 9:09 PM, "Matthieu Bec" <[email protected]> wrote:
>
>>
>> Hi all,
>>
>> I'm having a terminology issue someone might help with, because the
>> comments posted on this thread appear to mix 'record' and 'PV'
>> terminology interchangeably. Most of the time it's clear, and although
>> there is a reasonable '1 to n' relation between the two, I can think of
>> example that relation can break. To give an example, say:
>>
>> ioc1 uses old xxx record type, that does not have .YYY field
>> ioc2 uses new xxx record type, that has a new .YYY field
>>
>> xxx 'record' (dbl/dbgrep etc) report the same thing.
>> but ioc2 use a newer version that might add/remove some fields (that I
>> think is what we really call PV = I think of it as the entity you get
>> over channel access)
>>
>> So what does pvCrawl really look at: PVs or records? does it figure in
>> my example field .YYY exists in ioc2 but not ioc1?
>>
>> Thanks
>> Matthieu
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