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Mention "PostgreSQL"'s hashes as slower/similar to btree.

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Bruce Momjian
2002-06-21 19:06:44 +00:00
parent 1415a8388f
commit dad0e20f29
3 changed files with 23 additions and 19 deletions
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doc/src/sgml/diskusage.sgml
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@ -1,5 +1,5 @@
<!--
$Header: /cvsroot/pgsql/doc/src/sgml/diskusage.sgml,v 1.1 2002/06/13 05:15:22 momjian Exp $
$Header: /cvsroot/pgsql/doc/src/sgml/diskusage.sgml,v 1.2 2002/06/21 19:06:44 momjian Exp $
-->
<chapter id="diskusage">
@ -22,10 +22,12 @@ $Header: /cvsroot/pgsql/doc/src/sgml/diskusage.sgml,v 1.1 2002/06/13 05:15:22 mo
</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:
You can monitor disk space from three places: from
<application>psql</> using <command>VACUUM</> information, from
<application>psql</> using <application>contrib/dbsize</>, and from
the command line using <application>contrib/oid2name</>. Using
<application>psql</> on a recently vacuumed (or analyzed) database,
you can issue queries to see the disk usage of any table:
<programlisting>
play=# SELECT relfilenode, relpages
play-# FROM pg_class
@ -38,10 +40,10 @@ play-# WHERE relname = 'customer';
</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:
Each page is typically 8 kilobytes. (Remember, <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 shown above:
<programlisting>
play=# SELECT relname, relpages
play-# FROM pg_class