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Make allow_system_table_mods settable at run time

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Make allow_system_table_mods settable at run time by superusers.  It
was previously postmaster start only.

We don't want to make system catalog DDL wide-open, but there are
occasionally useful things to do like setting reloptions or statistics
on a busy system table, and blocking those doesn't help anyone.  Also,
this enables the possibility of writing a test suite for this setting.

Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us>
Discussion: https://www.postgresql.org/message-id/flat/8b00ea5e-28a7-88ba-e848-21528b632354%402ndquadrant.com
This commit is contained in:
Peter Eisentraut 2019-11-29 10:04:45 +01:00
parent 508bf95b76
commit c4a7a392ec
2 changed files with 6 additions and 4 deletions
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8
doc/src/sgml/config.sgml
View File

@ -9501,9 +9501,11 @@ dynamic_library_path = 'C:\tools\postgresql;H:\my_project\lib;$libdir'
</term>
<listitem>
<para>
Allows modification of the structure of system tables.
This is used by <command>initdb</command>.
This parameter can only be set at server start.
Allows modification of the structure of system tables as well as
certain other risky actions on system tables. This is otherwise not
allowed even for superusers. Ill-advised use of this setting can
cause irretrievable data loss or seriously corrupt the database
system. Only superusers can change this setting.
</para>
</listitem>
</varlistentry>

2
src/backend/utils/misc/guc.c
View File

@ -1777,7 +1777,7 @@ static struct config_bool ConfigureNamesBool[] =
},
{
{"allow_system_table_mods", PGC_POSTMASTER, DEVELOPER_OPTIONS,
{"allow_system_table_mods", PGC_SUSET, DEVELOPER_OPTIONS,
gettext_noop("Allows modifications of the structure of system tables."),
NULL,
GUC_NOT_IN_SAMPLE