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doc: add section about heap-only tuples (HOT)

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Reported-by: Jonathan S. Katz

Discussion: https://postgr.es/m/c59ffbd5-96ac-a5a5-a401-14f627ca1405@postgresql.org

Backpatch-through: 11
This commit is contained in:
Bruce Momjian
2022-08-12 15:05:13 -04:00
parent 50e088d6f2
commit 115464bb5b
9 changed files with 86 additions and 11 deletions
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doc/src/sgml/ref/create_table.sgml
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@@ -1435,7 +1435,9 @@ WITH ( MODULUS <replaceable class="parameter">numeric_literal</replaceable>, REM
to the indicated percentage; the remaining space on each page is
reserved for updating rows on that page. This gives <command>UPDATE</command>
a chance to place the updated copy of a row on the same page as the
original, which is more efficient than placing it on a different page.
original, which is more efficient than placing it on a different
page, and makes <link linkend="storage-hot">heap-only tuple
updates</link> more likely.
For a table whose entries are never updated, complete packing is the
best choice, but in heavily updated tables smaller fillfactors are
appropriate. This parameter cannot be set for TOAST tables.