[Koha] How are authority records connected with biblio records ?

[David Holoshka]

Hi,

I am migrating several million records from an existing vtls system to 
koha.  We are using mariadb, koha 17.05 (have pulled from master 
yesterday ), elastic search 5.4 and plack on debian systems.  As I 
wanted to preserve all the authority to biblio record links  I wrote my 
own migration script based on the relevant koha source.

Searching in the koha authorities intra will find the authority record 
but usually lists the number of biblio records having the auth as zero, 
but not always.  If I check the biblio index in ES the items have the 
correct auth id in the "an" field.  I can find no difference between the 
biblio records in the ES index that are reported as linked to the auth 
record to the ones that are not.  I connect the biblio recs to the 
authorities in the marc21 structure by putting the  koha auth id in 
field 100 sub field 9 (if it is a name auth).  These marc records are 
now in the new biblio_metadata table.


How does koha find the biblio records connected to a paticular auth 
record ?

Is this done dynamically by searching the ES indexes ?


Is this an issue with the zebra database?  Is it still required ?  I 
haven't been loading data into it since we switched to ES.

Best Regards,

Dave