[Koha-devel] biblio and biblioitems

[Mathieu Saby]

Galen Charlton a écrit :
> Hi,
>
> On Fri, May 3, 2013 at 6:20 AM, Mathieu Saby
> <mathieu.saby at univ-rennes2.fr> wrote:
>   
>> Thank you.
>> So, just to know, do you think it would be
>> 1. - a total waste of time ?
>> 2. - a strange idea ?
>> 3. - a good idea (for performance and code maintenance) ?
>> 4. - harmful ?
>>
>> to merge the biblio and biblioitem tables ?
>>     
>
> My gut feeling is #3, but a lot of testing would be needed to avoid
> #4.  Possibly one way to reduce risk and improve testability would be
> to move columns over to biblio one at a time.
>
> Here are a couple additional thoughts if we undertake this:
>
> [1] We should decide whether we want to keep both bibilioitems.marc
> and biblioitems.marcxml.  I think we can get rid of the former.
>
> [2] Even if we merge the tables, I think we should still keep the
> marcxml column in its own table, e.g., one called biblio_metadata:
>
> CREATE TABLE biblio_metadata (
>    biblio_metadata_id INTEGER NOT NULL AUTO_INCREMENT; -- for the future!
>    biblionumber INTEGER,
>    metadata_type VARCHAR(10), -- for the future!
>    blob LONGTEXT NOT NULL,
>    -- and relevant FK contraints
> );
>
> The bits about slipping in multi-metadata-schema support aside, for
> many queries there's no reason to pull in largish XML columns.
>   

Maybe the problem is the way some subs are written, getting all the 
columns of biblio and biblioitems ?
If they do not contain SELECT * but SELECT a,b,c,d..., is it necessary 
to put marcxml in an other table ?

I know quite nothing in SQL, so excuse me if it is a bad question...

M. Saby


> [3] We should see if we can drop some columns.  As a rule of thumb, I
> suggest that if a biblio/bilbioitems column isn't referred to in the
> code. any of the default MARC frameworks, or the SQL reports library,
> it's probably not being used.
>
> Regards,
>
> Galen
> --
> Galen Charlton
> Manager of Implementation
> Equinox Software, Inc. / The Open Source Experts
> email:  gmc at esilibrary.com
> direct: +1 770-709-5581
> cell:   +1 404-984-4366
> skype:  gmcharlt
> web:    http://www.esilibrary.com/
> Supporting Koha and Evergreen: http://koha-community.org &
> http://evergreen-ils.org
>   


-- 
Mathieu Saby
Service d'Informatique Documentaire
Service Commun de la Documentation
Université Rennes 2
Téléphone : 02 99 14 12 65
Courriel : mathieu.saby at univ-rennes2.fr

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