January 2019
Beginner
556 pages
14h 19m
English
Content preview from Learning PostgreSQL 11 - Third Edition
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User databases
You can have as many databases as you want in a database cluster. A client that connects to the PostgreSQL server can access only the data in a single database, which is specified in the connection string. That means data isn't shared between the databases unless the PostgreSQL foreign data wrapper or DB link extensions are used.
It's recommended to use PostgreSQL foreign data wrapper to do cross-database querying. DB link, if not used carefully, might cause memory exhaustion issues.
Every database in the database cluster has an owner and a set of associated permissions to control the actions allowed for a particular role. The privileges on PostgreSQL objects, which include databases, views, tables, and sequences, are represented ...
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