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Re: [EP-tech] Trying to understand a disaster after a database update

Hi Laurent,
Obviously, if you want to retain the old field, ignore my advice about removing this field in the workflow and other config files. I think I read the inappropriate as applying to the field as a whole rather than the import data being added to this field when it was not appropriate and a new field with a more appropriate name would be better.  If you write a "rule" then you could get the is unset the old field whilst setting the new field.  You could also have some conditional statement to only move the value when it matches certain patterns, so it only moves the value to the new field when it is appropriate. 

Regards

David Newman

On 16/11/2020 11:28, Laurent Cloarec wrote:

CAUTION: This e-mail originated outside the University of Southampton.

Thanks David for your first (and quick) answer !
To refine further a small detail, I didn't suppress (nor from eprints_field.pl or the database) the "old" field/metadata, so both of them (the old and the new ones : both of them are useful in our functional processes, but for distinct purposes) still exists in the repository schema and in the database structure... 

Best regards and thanks for your help
Laurent Cloarec

Le 16/11/2020 à 12:09, David R Newman a écrit :


Hi Laurent,
So to confirm: Are there are no records in the eprint database table or you just don't see any records when you look at the Manage Deposits page in the repository?  When you ran recommit at the end of your set of instructions. How long did this take to run and how many record did you have before you started this whole process?  If it took quite a long time then it suggests some how the recommit process caused you problem.  However, if it ran quickly this suggests you eprint records were already deleted or broken so could not 
be displayed in the Manage Deposits page.

As a general comment on your solution.  I would have not dumped out and
reimported database tables.  I would have created a rule (block of code) in your archive's cfg/cfg.d/eprint_fields_automatic.pl to map (probably just copy) the old field to new field.  You would have still had to have the old field defined in eprint_fields.pl but as long as you had removed the old field 
from the eprint workflow and any other config files (except
eprint_fields_automatic.pl and eprint_fields.pl) it should not be editable, or visible to non-logged in users.  You would then need to run epadmin recommit like you did in your original instructions and once this completed you could remove (probably best to comment out) references to the old field and the rule 
to map the old field to the new field.

Regards

David Newman

On 16/11/2020 10:49, Laurent Cloarec via Eprints-tech wrote:
*CAUTION:* This e-mail originated outside the University of Southampton. 
Hello everyone
The initial problem : many (about 1,000) metadata values entered by archive editors in a non appropriate field (used in parallel for another purpose by 
another import mechanism), let's say "infoX". Into the database, this
information was stored in a table looking like
"eprint_creators_infoX(eprintid,pos,creators_infoX)"

The solution employed :

 1. create a new metadata/field (let's say "infoY") among the creators
    metadata (with "eprints_fields.pl") and update the database structure in 
    consequence => creation of a new table
    "eprint_creators_infoY(eprintid,pos,creators_infoY)"
 2. backup (SQL values dump) the important values previously entered and 
    stored into the "eprint_creators_infoX" table;
 3. from this backup, create a new SQL file where the "infoX" column name is 
    replaced by "infoY";
 4. import these values into the new table ""eprint_creators_infoY";
 5. delete the previously entered value from "eprint_creators_infoX" table     (/there was an objective criteria to distinguish the entered from the 
    imported values/);
 6. run "bin/epdamin recommit <archivename> eprint"
The disaster/issue that happened : all the records from "eprint" main table have been deleted, and the archive/repository consequently appears as empty!!! 

Could someone explain this???

Best regards
--
Laurent Cloarec
Service Commun de la Documentation - Service du Numérique Documentaire
Université Toulouse 1 Capitole
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