What is the database used for in Fedora 6?

[John Gostick]

Hi everyone,

I've been reading and learning about Fedora recently and have a quick question about what the database is used for. 

I know that in Fedora 5 and earlier,  RDF resources and small binary files were stored directly in the database rather than being written to disk, but in Fedora 6 all RDF resources are stored on disk (in OCFL), which I can see for myself when poking around the file system structure. 

My question is whether the RDF resources are ALSO stored in the database, or are they now stored exclusively on disk? If they're not stored in the database, I'm curious to know what is (just a high-level summary!)

Thanks

John Gostick

[Benjamin Armintor]

Hi John,

The hosting organization for the Fedora Commons project (LYRASIS) has a wiki for the project; the 6.x documentation is here: https://wiki.lyrasis.org/display/FEDORA6x/Fedora+6.x+Documentation

The chart on the front page identifies the database options. There's a page under "Technical Documentation" that digs into what is stored in the database: https://wiki.lyrasis.org/display/FEDORA6x/Internal+Database+Tables

Regards,

Ben 

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[Andrew Woods]

Hello John,

I will elaborate on Ben's comment by saying that the Fedora database is used as a cache to facilitate quick lookup of the repository content and to support transactions. 

As you have noted, all of the data is persisted "on disk". The database will be rebuilt from the data on disk if the repository is started with an empty database. Also, you can force a database rebuild. 

See: https://wiki.lyrasis.org/display/FEDORA6x/Internal+Database+Tables

Regards,

Andrew

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