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Database-level collation version tracking

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This adds to database objects the same version tracking that collation
objects have.  There is a new pg_database column datcollversion that
stores the version, a new function
pg_database_collation_actual_version() to get the version from the
operating system, and a new subcommand ALTER DATABASE ... REFRESH
COLLATION VERSION.

This was not originally added together with pg_collation.collversion,
since originally version tracking was only supported for ICU, and ICU
on a database-level is not currently supported.  But we now have
version tracking for glibc (since PG13), FreeBSD (since PG14), and
Windows (since PG13), so this is useful to have now.

Reviewed-by: Julien Rouhaud <rjuju123@gmail.com>
Discussion: https://www.postgresql.org/message-id/flat/f0ff3190-29a3-5b39-a179-fa32eee57db6%40enterprisedb.com
This commit is contained in:
Peter Eisentraut
2022-02-14 08:09:04 +01:00
parent 9898c5e03c
commit 37851a8b83
22 changed files with 367 additions and 15 deletions
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21
doc/src/sgml/ref/create_database.sgml
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@@ -28,6 +28,7 @@ CREATE DATABASE <replaceable class="parameter">name</replaceable>
[ LOCALE [=] <replaceable class="parameter">locale</replaceable> ]
[ LC_COLLATE [=] <replaceable class="parameter">lc_collate</replaceable> ]
[ LC_CTYPE [=] <replaceable class="parameter">lc_ctype</replaceable> ]
[ COLLATION_VERSION = <replaceable>collation_version</replaceable> ]
[ TABLESPACE [=] <replaceable class="parameter">tablespace_name</replaceable> ]
[ ALLOW_CONNECTIONS [=] <replaceable class="parameter">allowconn</replaceable> ]
[ CONNECTION LIMIT [=] <replaceable class="parameter">connlimit</replaceable> ]
@@ -158,6 +159,26 @@ CREATE DATABASE <replaceable class="parameter">name</replaceable>
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><replaceable>collation_version</replaceable></term>
<listitem>
<para>
Specifies the collation version string to store with the database.
Normally, this should be omitted, which will cause the version to be
computed from the actual version of the database collation as provided
by the operating system. This option is intended to be used by
<command>pg_upgrade</command> for copying the version from an existing
installation.
</para>
<para>
See also <xref linkend="sql-alterdatabase"/> for how to handle
database collation version mismatches.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><replaceable class="parameter">tablespace_name</replaceable></term>
<listitem>