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Mastering PostgreSQL 15

Mastering PostgreSQL 15

By : Hans-Jürgen Schönig
4.9 (7)
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Mastering PostgreSQL 15

Mastering PostgreSQL 15

4.9 (7)
By: Hans-Jürgen Schönig

Overview of this book

Starting with an introduction to the newly released features of PostgreSQL 15, this updated fifth edition will help you get to grips with PostgreSQL administration and how to build dynamic database solutions for enterprise apps, including designing both physical and technical aspects of the system. You'll explore advanced PostgreSQL features, such as logical replication, database clusters, advanced indexing, and user management to manage and maintain your database. You'll then work with the PostgreSQL optimizer, configure PostgreSQL for high speed, and move from Oracle to PostgreSQL. Among the other skills that the book will help you build, you’ll cover transactions, handling recursions, working with JSON and JSONB data, and setting up a Patroni cluster. It will show you how to improve performance with query optimization. You'll also focus on managing network security and work with backups and replication while exploring useful PostgreSQL extensions that optimize the performance of large databases. By the end of this PostgreSQL book, you’ll be able to use your database to its utmost capacity by implementing advanced administrative tasks with ease.
Table of Contents (16 chapters)
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Reassigning objects and dropping users

After assigning permissions and restricting access on various levels, it can happen that users are dropped from the system. Unsurprisingly, the commands to do this are the DROP ROLE and DROP USER commands. Here is the syntax of DROP ROLE:

test=# \h DROP ROLE
Command: DROP ROLE
Description: remove a database role
Syntax:
 DROP ROLE [ IF EXISTS ] name [, ...]
 URL: https://www.postgresql.org/docs/14/sql-droprole.html

Once the syntax of DROP ROLE has been discussed, we can give it a try. The following listing shows how this works:

test=# DROP ROLE joe;
ERROR:  role  "joe"  cannot be dropped because some  objects depend on it
DETAIL:  target of policy joe_pol_3 on table t_person
target of policy joe_pol_2 on table t_person
target of policy joe_pol_1 on table t_person
privileges for table t_person
owner of table t_user
owner of sequence t_user_id_seq
owner of default privileges on...

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