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• The Registry Core (or the Registry Kernel) is a part of the Carbon Core.
• At the heart of the Registry Core lies the Repository, fronted by a Data Access Layer through which the data is stored and fetched on a JDBC compliant RDBMS.
• In addition to fixed SQL queries, WSO2 Governance Registry also supports execution of customized SQL queries.
• We support a wide-variety of DBMS:

1. 1. IBM DB2
   2. Apache Derby (Embedded and Remote)
   3. H2 (Local and Remote)
   4. Microsoft SQL Server (and Express Editions)
   5. OpenEdge
   6. Oracle 10g/11g
   7. MySQL
   8. PostgreSQL

• The Registry API provides a programming interface to the Registry Core, which lays the foundation for extension APIs such as the JCR 2.0 API.
• There are three key registry features that exist at the top of the repository which can be used to provide your own customization on top of the base product.

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