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Mention that tables have a visibility map fork alongside the main fork

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and FSM.
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Heikki Linnakangas 2009-04-23 10:20:27 +00:00
parent 335904b4f8
commit 88f4d38d20
1 changed files with 4 additions and 2 deletions
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6
doc/src/sgml/storage.sgml
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@ -1,4 +1,4 @@
<!-- $PostgreSQL: pgsql/doc/src/sgml/storage.sgml,v 1.26 2008/10/06 14:13:17 heikki Exp $ -->
<!-- $PostgreSQL: pgsql/doc/src/sgml/storage.sgml,v 1.27 2009/04/23 10:20:27 heikki Exp $ -->
<chapter id="storage">
@ -134,7 +134,9 @@ or index's <firstterm>filenode</> number, which can be found in
main file (aka. main fork), a <firstterm>free space map</> (see
<xref linkend="storage-fsm">) that stores information about free space
available in the relation, is stored in a file named after the filenode
number, with the the <literal>_fsm</> suffix.
number, with the <literal>_fsm</> suffix. Tables also have a visibility map
fork, with the <literal>_vm</> suffix, to track which pages are known to have
no dead tuples and therefore need no vacuuming.
</para>
<caution>