[Clas12_calcom] Micromegas DAQ constants update

[Guillaume CHRISTIAENS]

Ok I'll proceed that way.

Thanks for your reply (that late).

Guillaume


Le 16/02/2018 à 16:02, Raffaella De Vita a écrit :
> Dear Guillaume,
> given the type of modification you need, I would be in favor of 
> deleting and recreating the table with the additional colums. Since 
> there is only one entry, it would take a few minutes to do the change.
> Best regards,
>     Raffaella
>
> Francois-Xavier Girod wrote:
>> Dear Guillaume
>>
>> I am not currently doing any mass decoding. I see a couple people 
>> doing simulations on the batch farm, although I doubt they could be 
>> affected.
>>
>> Best regards
>> FX
>>
>> On Fri, Feb 16, 2018 at 3:35 PM, Guillaume CHRISTIAENS 
>> <guillaum at jlab.org <mailto:guillaum at jlab.org>> wrote:
>>
>>     Hi all,
>>
>>     In order to reduce Micromegas data size, we now use "sparse
>>     samples" in MVT. To compute a time information correctly we need
>>     this information to be accessible during the decoding.
>>
>>     Since it's an electronic feature that we didn't know before
>>     facing this data size issue, ccdb table was not made to hold this
>>     information. Then I would like to add 2 constants and thus 2
>>     columns to the current DAQ table for micromegas
>>     (/daq/config/bmt). It's only a 1-row table so not too heavy.
>>
>>     I think the only ways to add columns are to delete the table and
>>     create a new one, or to create a duplicate table with a different
>>     name (like /daq/config/bmt2). Even if it's not the spirit of
>>     ccdb, I clearly prefer the first solution, to keep clean and
>>     clear tables, and since it's just adding column,
>>     retro-compatibility will be fine.
>>
>>     The only issue I see is if someone is decoding a file at the
>>     moment the table is deleted and then created again, he may have
>>     errors.
>>
>>     What do you think ?
>>
>>     Regards,
>>
>>     Guillaume
>>
>>
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>

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