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Starting from DSpace 3.0 you can configure which implementation use for the Browse DAOs both for create/update operations and for read operations. This allows you to customize which browse engine is utilized in your DSpace.  Options include:

• SOLR Browse Engine (SOLR DAOs) - This enables Apache Solr to be utilized as a backend for all browsing of DSpace.  This option requires that you have Discovery (Solr search/browse engine) enabled in your DSpace.
• PostgreSQL Browse Engine (PostgreSQL DAOs) - TThis This enables all browsing to be done via PostgreSQL database tables.  (This is the traditional browsing option for users who have PostgreSQL installed.)
• Oracle Browse Engine (Oracle DAOs) - This enables all browsing to be done via Oracle database tables.  (This is the traditional browsing option for users who have Oracles installed.)

Use of the SOLR DAOs backend for the Browse Engine requires that you have Discovery enabled. Please check the Discovery configuration section.