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OAI 2.0 is a separate webapp which is a complete substitute for the old "oai" webapp. OAI 2.0 has a configurable data source, by default it will not query the DSpace SQL database at the time of the OAI-PMH request. Instead, it keeps the required metadata in its Solr index (currently in a separate "oai" Solr core) and serves it from there. Although it's also possible to set OAI 2.0 to only use the database for querying purposes. Furthermore, it caches the requests, so doing the same query repeatedly is very fast, but not only, it also compiles DSpace items to making make uncached responses much faster.

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