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Unlogged sequences

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Add support for unlogged sequences.  Unlike for unlogged tables, this
is not a performance feature.  It allows sequences associated with
unlogged tables to be excluded from replication.

A new subcommand ALTER SEQUENCE ... SET LOGGED/UNLOGGED is added.

An identity/serial sequence now automatically gets and follows the
persistence level (logged/unlogged) of its owning table.  (The
sequences owned by temporary tables were already temporary through the
separate mechanism in RangeVarAdjustRelationPersistence().)  But you
can still change the persistence of an owned sequence separately.
Also, pg_dump and pg_upgrade preserve the persistence of existing
sequences.

Discussion: https://www.postgresql.org/message-id/flat/04e12818-2f98-257c-b926-2845d74ed04f%402ndquadrant.com
This commit is contained in:
Peter Eisentraut
2022-04-07 16:13:23 +02:00
parent bab588cd5c
commit 344d62fb9a
16 changed files with 237 additions and 31 deletions
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5
doc/src/sgml/ref/create_table.sgml
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@@ -215,6 +215,11 @@ WITH ( MODULUS <replaceable class="parameter">numeric_literal</replaceable>, REM
Any indexes created on an unlogged table are automatically unlogged as
well.
</para>
<para>
If this is specified, any sequences created together with the unlogged
table (for identity or serial columns) are also created as unlogged.
</para>
</listitem>
</varlistentry>