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Allow "in place" tablespaces.

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Provide a developer-only GUC allow_in_place_tablespaces, disabled by
default.  When enabled, tablespaces can be created with an empty
LOCATION string, meaning that they should be created as a directory
directly beneath pg_tblspc.  This can be used for new testing scenarios,
in a follow-up patch.  Not intended for end-user usage, since it might
confuse backup tools that expect symlinks.

Reviewed-by: Andres Freund <andres@anarazel.de>
Reviewed-by: Michael Paquier <michael@paquier.xyz>
Discussion: https://postgr.es/m/CA%2BhUKGKpRWQ9SxdxxDmTBCJoR0YnFpMBe7kyzY8SUQk%2BHeskxg%40mail.gmail.com
This commit is contained in:
Thomas Munro
2022-01-14 21:27:44 +13:00
parent c4cc2850f4
commit 7170f2159f
4 changed files with 65 additions and 7 deletions
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19
doc/src/sgml/config.sgml
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@@ -10433,6 +10433,25 @@ dynamic_library_path = 'C:\tools\postgresql;H:\my_project\lib;$libdir'
</para>
<variablelist>
<varlistentry id="guc-allow-in-place-tablespaces" xreflabel="allow_in_place_tablespaces">
<term><varname>allow_in_place_tablespaces</varname> (<type>boolean</type>)
<indexterm>
<primary><varname>allow_in_place_tablespaces</varname> configuration parameter</primary>
</indexterm>
</term>
<listitem>
<para>
Allows tablespaces to be created as directories inside
<filename>pg_tblspc</filename>, when an empty location string
is provided to the <command>CREATE TABLESPACE</command> command. This
is intended to allow testing replication scenarios where primary and
standby servers are running on the same machine. Such directories
are likely to confuse backup tools that expect to find only symbolic
links in that location. Only superusers can change this setting.
</para>
</listitem>
</varlistentry>
<varlistentry id="guc-allow-system-table-mods" xreflabel="allow_system_table_mods">
<term><varname>allow_system_table_mods</varname> (<type>boolean</type>)
<indexterm>