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| author | Heikki Linnakangas <heikki.linnakangas@iki.fi> | 2009-04-23 10:20:27 +0000 |
|---|---|---|
| committer | Heikki Linnakangas <heikki.linnakangas@iki.fi> | 2009-04-23 10:20:27 +0000 |
| commit | 88f4d38d20ff7aec3b2f8e899b3f3d8daede6ae3 (patch) | |
| tree | 42d576f284eee81d4609c895041a4dffe5cf6e65 | |
| parent | 335904b4f8949645d9481177f3da373f7b36bc00 (diff) | |
| download | postgresql-88f4d38d20ff7aec3b2f8e899b3f3d8daede6ae3.tar.gz postgresql-88f4d38d20ff7aec3b2f8e899b3f3d8daede6ae3.zip | |
Mention that tables have a visibility map fork alongside the main fork
and FSM.
| -rw-r--r-- | doc/src/sgml/storage.sgml | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/doc/src/sgml/storage.sgml b/doc/src/sgml/storage.sgml index 9b93ea5599b..9e19aa63e43 100644 --- a/doc/src/sgml/storage.sgml +++ b/doc/src/sgml/storage.sgml @@ -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> |