January 2019
Beginner
556 pages
14h 19m
English
Content preview from Learning PostgreSQL 11 - Third Edition
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Foreign data wrappers
In 2011, PostgreSQL 9.1 was released with a read-only support for SQL/Management of External Data (MED) ISO/IEC 9075-9:2003 standard. SQL/MED defines foreign data wrappers (FDWs) to allow the relational database to manage external data. FDW can be used to achieve data integration in a federated database-system environment. PostgreSQL supports RDBMS, NoSQL, and foreign data wrapper files, including Oracle, Redis, MongoDB, and delimited files.
A simple use case for FDWs is to have one database server for analytical purposes, and then ship the result of this server to another server that works as a caching layer.
Also, FDW can be used to test data changes. Imagine you have two databases, one with different data due to applying ...
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