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Further improve documentation of the role-dropping process.

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In commit 1ea0c73c2 I added a section to user-manag.sgml about how to drop
roles that own objects; but as pointed out by Stephen Frost, I neglected
that shared objects (databases or tablespaces) may need special treatment.
Fix that.  Back-patch to supported versions, like the previous patch.
This commit is contained in:
Tom Lane
2015-12-04 14:44:13 -05:00
parent 7882143dca
commit f9fc8e79cd
1 changed files with 18 additions and 7 deletions
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doc/src/sgml/user-manag.sgml
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@@ -436,17 +436,23 @@ ALTER TABLE bobs_table OWNER TO alice;
</programlisting> </programlisting>
Alternatively, the <xref linkend="sql-reassign-owned"> command can be Alternatively, the <xref linkend="sql-reassign-owned"> command can be
used to reassign ownership of all objects owned by the role-to-be-dropped used to reassign ownership of all objects owned by the role-to-be-dropped
to a single other role. Because <command>REASSIGN OWNED</> can only to a single other role. Because <command>REASSIGN OWNED</> cannot access
access objects in the current database, it is necessary to run it in each objects in other databases, it is necessary to run it in each database
database that contains objects owned by the role. that contains objects owned by the role. (Note that the first
such <command>REASSIGN OWNED</> will change the ownership of any
shared-across-databases objects, that is databases or tablespaces, that
are owned by the role-to-be-dropped.)
</para> </para>
<para> <para>
Once any valuable objects have been transferred to new owners, any Once any valuable objects have been transferred to new owners, any
remaining objects owned by the role-to-be-dropped can be dropped with remaining objects owned by the role-to-be-dropped can be dropped with
the <xref linkend="sql-drop-owned"> command. Again, this command can the <xref linkend="sql-drop-owned"> command. Again, this command cannot
only access objects in the current database, so it is necessary to run it access objects in other databases, so it is necessary to run it in each
in each database that contains objects owned by the role. database that contains objects owned by the role. Also, <command>DROP
OWNED</> will not drop entire databases or tablespaces, so it is
necessary to do that manually if the role owns any databases or
tablespaces that have not been transferred to new owners.
</para> </para>
<para> <para>
@@ -461,7 +467,6 @@ ALTER TABLE bobs_table OWNER TO alice;
<para> <para>
In short then, the most general recipe for removing a role that has been In short then, the most general recipe for removing a role that has been
used to own objects is: used to own objects is:
</para> </para>
<programlisting> <programlisting>
REASSIGN OWNED BY doomed_role TO successor_role; REASSIGN OWNED BY doomed_role TO successor_role;
@@ -470,6 +475,12 @@ DROP OWNED BY doomed_role;
DROP ROLE doomed_role; DROP ROLE doomed_role;
</programlisting> </programlisting>
<para>
When not all owned objects are to be transferred to the same successor
owner, it's best to handle the exceptions manually and then perform
the above steps to mop up.
</para>
<para> <para>
If <command>DROP ROLE</> is attempted while dependent objects still If <command>DROP ROLE</> is attempted while dependent objects still
remain, it will issue messages identifying which objects need to be remain, it will issue messages identifying which objects need to be