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Mastering PostgreSQL 9.6

You're reading from   Mastering PostgreSQL 9.6 A comprehensive guide for PostgreSQL 9.6 developers and administrators

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Product type Paperback
Published in May 2017
Publisher
ISBN-13 9781783555352
Length 416 pages
Edition 1st Edition
Languages
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Author (1):
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Hans-Jürgen Schönig Hans-Jürgen Schönig
Author Profile Icon Hans-Jürgen Schönig
Hans-Jürgen Schönig
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Toc

Table of Contents (14) Chapters Close

Preface 1. PostgreSQL Overview FREE CHAPTER 2. Understanding Transactions and Locking 3. Making Use of Indexes 4. Handling Advanced SQL 5. Log Files and System Statistics 6. Optimizing Queries for Good Performance 7. Writing Stored Procedures 8. Managing PostgreSQL Security 9. Handling Backup and Recovery 10. Making Sense of Backups and Replication 11. Deciding on Useful Extensions 12. Troubleshooting PostgreSQL 13. Migrating to PostgreSQL

Reassigning objects and dropping users

After assigning permissions and restricting access, it can happen that users will be dropped from the system. Unsurprisingly, the commands to do that are the DROP ROLE and DROP USER commands:

test=# h DROP ROLE 
Command: DROP ROLE
Description: remove a database role
Syntax:
DROP ROLE [ IF EXISTS ] name [, ...]

Let us give it a try:

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 new relations belonging to role joe
in schema public
owner of table t_useful

PostgreSQL will issue error messages because a user can only be removed if everything has been...

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