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Document the way partition MERGE/SPLIT operations create new partitions

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Reported-by: Justin Pryzby
Discussion: https://postgr.es/m/ZilrByTp-pbz6Mvf%40pryzbyj2023
Reviewed-by: Justin Pryzby
This commit is contained in:
Alexander Korotkov
2024-04-30 11:54:56 +03:00
parent 885742b9f8
commit 842c9b2705
1 changed files with 12 additions and 0 deletions
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doc/src/sgml/ref/alter_table.sgml
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@@ -1153,6 +1153,12 @@ WITH ( MODULUS <replaceable class="parameter">numeric_literal</replaceable>, REM
splitting we have a partition with the same name).
Only simple, non-partitioned partition can be split.
</para>
<para>
The new partitions will be created the same as tables created with the
SQL command <literal>CREATE TABLE <replaceable class="parameter">partition_nameN</replaceable> (LIKE <replaceable class="parameter">name</replaceable> INCLUDING ALL EXCLUDING INDEXES EXCLUDING IDENTITY)</literal>.
The indexes and identity are created later, after moving the data
into the new partitions.
</para>
<note>
<para>
This command acquires an <literal>ACCESS EXCLUSIVE</literal> lock.
@@ -1213,6 +1219,12 @@ WITH ( MODULUS <replaceable class="parameter">numeric_literal</replaceable>, REM
can have the same name as one of the merged partitions. Only simple,
non-partitioned partitions can be merged.
</para>
<para>
The new partition will be created the same as a table created with the
SQL command <literal>CREATE TABLE <replaceable class="parameter">partition_name</replaceable> (LIKE <replaceable class="parameter">name</replaceable> INCLUDING ALL EXCLUDING INDEXES EXCLUDING IDENTITY)</literal>.
The indexes and identity are created later, after moving the data
into the new partition.
</para>
<note>
<para>
This command acquires an <literal>ACCESS EXCLUSIVE</literal> lock.