Forum: Skype presents: PL/Proxy 2.0
Posted by: Marko Kreen from a partitioned database. The actual query to be executed on partition is constructed by looking proxy function signature. https://developer.skype.com/SkypeGarage/DbProjects/PlProxy So, to call function "get_user_email(username text) returns text", the proxy function need to be defined following: CREATE FUNCTION get_user_email(username text) RETURNS text AS $$ CLUSTER 'userdb'; RUN ON hashtext(username); $$ LANGUAGE plproxy; assuming actual partitions are defined under cluster 'userdb' and users are spread out between partitions by hashtext(name). PL/Proxy can be used for simple remote queries, without need for any external configuration: CREATE FUNCTION get_user_email(username text) RETURNS text AS $$ CONNECT 'dbname=userdb host=1.2.3.4'; SELECT email FROM users WHERE name = username; $$ LANGUAGE plproxy; This also demonstrates that its possible to override default 'SELECT * FROM func(...)' query generation and to run user-specified SELECT statement on remote server.
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