Federated is a storage engine for the
MySQL
MySQL () is an Open-source software, open-source relational database management system (RDBMS). Its name is a combination of "My", the name of co-founder Michael Widenius's daughter My, and "SQL", the acronym for Structured Query Language. A rel ...
MariaDB
MariaDB is a community-developed, commercially supported Fork (software development), fork of the MySQL relational database management system (RDBMS), intended to remain free and open-source software under the GNU General Public License. Developm ...
relational database management system
A relational database (RDB) is a database based on the relational model of data, as proposed by E. F. Codd in 1970.
A Relational Database Management System (RDBMS) is a type of database management system that stores data in a structured for ...
that allows creation of a table that is a local representation of a foreign (remote) table. It uses the MySQL client library API as a data transport, treating remote tables as if they were located on the local server.
Each Federated table that is defined there is one .frm (data definition file containing information such as the URL of the data source). The actual data can exist on a local or remote MySQL instance.
To create a Federated table, one has to specify a URL in the "CONNECTION" string:
create table t1 (
a int,
b varchar(32))
ENGINE=FEDERATED CONNECTION='mysql://user@hostname/test/t1'
The connection URL is in the format of:
scheme://user:pass@host:port/schema/tablename
Upon creation of a Federated table, the user must ensure that the remote data source does indeed exist or an error will be issued.
The MySQL Federated Storage Engine was authored by Patrick Galbraith and
Brian Aker and is currently being maintained by Patrick Galbraith and Antony Curtis. It was introduced in 2005 with MySQL 5.0.
External links
MySQL Documentation on Federated Storage Engine
Database engines
MySQL
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