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Commit 2d237c7c authored by Bruce Momjian's avatar Bruce Momjian
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Move disk usage section into its own section.

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doc/src/sgml/admin.sgml
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<!--
$Header: /cvsroot/pgsql/doc/src/sgml/Attic/admin.sgml,v 1.36 2001/10/16 23:57:06 tgl Exp $
$Header: /cvsroot/pgsql/doc/src/sgml/Attic/admin.sgml,v 1.37 2002/06/13 05:15:22 momjian Exp $
-->
<book id="admin">
......@@ -32,8 +32,8 @@ $Header: /cvsroot/pgsql/doc/src/sgml/Attic/admin.sgml,v 1.36 2001/10/16 23:57:06
&maintenance;
&backup;
&monitoring;
&diskusage;
&wal;
&storage;
&recovery;
&regress;
&release;
......
doc/src/sgml/diskusage.sgml 0 → 100644
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<!--
$Header: /cvsroot/pgsql/doc/src/sgml/diskusage.sgml,v 1.1 2002/06/13 05:15:22 momjian Exp $
-->
<chapter id="diskusage">
<title>Monitoring Disk Usage</title>
<sect1 id="disk-usage">
<title>Monitoring Disk Usage</Title>
<indexterm zone="disk-usage">
<primary>disk usage</primary>
</indexterm>
<para>
Each table has a primary heap disk file where most of the data is
stored. To store long column values, there is also a
<acronym>TOAST</> file associated with the table, named based on the
table's oid (actually pg_class.relfilenode), and an index on the
<acronym>TOAST</> table. There also may be indexes associated with
the base table.
</para>
<para>
You can monitor disk space from two places; from inside
<application>psql</> and from the command line using
<application>contrib/oid2name</>. Using <application>psql</> you can
issue queries to see the disk usage for any table:
<programlisting>
play=# SELECT relfilenode, relpages
play-# FROM pg_class
play-# WHERE relname = 'customer';
relfilenode | relpages
-------------+----------
16806 | 60
(1 row)
</programlisting>
</para>
<para>
Each page is typically 8 kilobytes. <literal>relpages</> is only
updated by <command>VACUUM</> and <command>ANALYZE</>. To show the
space used by <acronym>TOAST</> tables, use a query based on the heap
relfilenode:
<programlisting>
play=# SELECT relname, relpages
play-# FROM pg_class
play-# WHERE relname = 'pg_toast_16806' or
play-# relname = 'pg_toast_16806_index'
play-# ORDER BY relname;
relname | relpages
----------------------+----------
pg_toast_16806 | 0
pg_toast_16806_index | 1
</programlisting>
</para>
<para>
You can easily display index usage too:
<programlisting>
play=# SELECT c2.relname, c2.relpages
play-# FROM pg_class c, pg_class c2, pg_index i
play-# WHERE c.relname = 'customer' AND
play-# c.oid = i.indrelid AND
play-# c2.oid = i.indexrelid
play-# ORDER BY c2.relname;
relname | relpages
----------------------+----------
customer_id_indexdex | 26
</programlisting>
</para>
<para>
It is easy to find your largest files using <application>psql</>:
<programlisting>
play=# SELECT relname, relpages
play-# FROM pg_class
play-# ORDER BY relpages DESC;
relname | relpages
----------------------+----------
bigtable | 3290
customer | 3144
</programlisting>
</para>
<para>
You can also use <application>oid2name</> to show disk usage. See
<filename>README.oid2name</> for examples. It includes a script
shows disk usage for each database.
</para>
</sect1>
</chapter>
<!-- Keep this comment at the end of the file
Local variables:
mode:sgml
sgml-omittag:nil
sgml-shorttag:t
sgml-minimize-attributes:nil
sgml-always-quote-attributes:t
sgml-indent-step:1
sgml-indent-data:t
sgml-parent-document:nil
sgml-default-dtd-file:"./reference.ced"
sgml-exposed-tags:nil
sgml-local-catalogs:("/usr/lib/sgml/catalog")
sgml-local-ecat-files:nil
End:
-->
doc/src/sgml/maintenance.sgml
+ 1
− 86
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<!--
$Header: /cvsroot/pgsql/doc/src/sgml/maintenance.sgml,v 1.13 2002/06/13 04:36:50 momjian Exp $
$Header: /cvsroot/pgsql/doc/src/sgml/maintenance.sgml,v 1.14 2002/06/13 05:15:22 momjian Exp $
-->
<chapter id="maintenance">
......@@ -366,91 +366,6 @@ VACUUM
</sect2>
</sect1>
<sect1 id="diskspace-maintenance">
<title>Disk Space Maintenance</title>
<indexterm zone="diskspace-maintenance">
<primary>disk space</primary>
</indexterm>
<para>
Each table has a primary heap disk file where most of the data is
stored. To store long column values, there is also a
<acronym>TOAST</> file associated with the table, named based on the
table's oid (actually pg_class.relfilenode), and an index on the
<acronym>TOAST</> table. There also may be indexes associated with
the base table.
</para>
<para>
You can monitor disk space from two places; from inside
<application>psql</> and from the command line using
<application>contrib/oid2name</>. Using <application>psql</> you can
issue queries to see the disk usage for any table:
<programlisting>
play=# SELECT relfilenode, relpages
play-# FROM pg_class
play-# WHERE relname = 'customer';
relfilenode | relpages
-------------+----------
16806 | 60
(1 row)
</programlisting>
</para>
<para>
Each page is typically 8 kilobytes. <literal>relpages</> is only
updated by <command>VACUUM</> and <command>ANALYZE</>. To show the
space used by <acronym>TOAST</> tables, use a query based on the heap
relfilenode:
<programlisting>
play=# SELECT relname, relpages
play-# FROM pg_class
play-# WHERE relname = 'pg_toast_16806' or
play-# relname = 'pg_toast_16806_index'
play-# ORDER BY relname;
relname | relpages
----------------------+----------
pg_toast_16806 | 0
pg_toast_16806_index | 1
</programlisting>
</para>
<para>
You can easily display index usage too:
<programlisting>
play=# SELECT c2.relname, c2.relpages
play-# FROM pg_class c, pg_class c2, pg_index i
play-# WHERE c.relname = 'customer' AND
play-# c.oid = i.indrelid AND
play-# c2.oid = i.indexrelid
play-# ORDER BY c2.relname;
relname | relpages
----------------------+----------
customer_id_indexdex | 26
</programlisting>
</para>
<para>
It is easy to find your largest files using <application>psql</>:
<programlisting>
play=# SELECT relname, relpages
play-# FROM pg_class
play-# ORDER BY relpages DESC;
relname | relpages
----------------------+----------
bigtable | 3290
customer | 3144
</programlisting>
</para>
<para>
You can also use <application>oid2name</> to show disk usage. See
<filename>README.oid2name</> for examples. It includes a script
shows disk usage for each database.
</para>
</sect1>
<sect1 id="logfile-maintenance">
<title>Log File Maintenance</title>
......
doc/src/sgml/storage.sgml deleted 100644 → 0
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− 9
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<Chapter Id="storage">
<Title>Disk Storage</Title>
<Para>
This section needs to be written. Some information is in the FAQ. Volunteers?
- thomas 1998-01-11
</Para>
</Chapter>
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