111 lines
2.6 KiB
Plaintext
111 lines
2.6 KiB
Plaintext
<!-- $PostgreSQL: pgsql/doc/src/sgml/vacuumlo.sgml,v 1.2 2007/12/06 04:12:10 tgl Exp $ -->
|
|
|
|
<sect1 id="vacuumlo">
|
|
<title>vacuumlo</title>
|
|
|
|
<indexterm zone="vacuumlo">
|
|
<primary>vacuumlo</primary>
|
|
</indexterm>
|
|
|
|
<para>
|
|
<application>vacuumlo</> is a simple utility program that will remove any
|
|
<quote>orphaned</> large objects from a
|
|
<productname>PostgreSQL</> database. An orphaned large object (LO) is
|
|
considered to be any LO whose OID does not appear in any <type>oid</> or
|
|
<type>lo</> data column of the database.
|
|
</para>
|
|
|
|
<para>
|
|
If you use this, you may also be interested in the <function>lo_manage</>
|
|
trigger in <filename>contrib/lo</> (see <xref linkend="lo">).
|
|
<function>lo_manage</> is useful to try
|
|
to avoid creating orphaned LOs in the first place.
|
|
</para>
|
|
|
|
<sect2>
|
|
<title>Usage</title>
|
|
|
|
<synopsis>
|
|
vacuumlo [options] database [database2 ... databaseN]
|
|
</synopsis>
|
|
|
|
<para>
|
|
All databases named on the command line are processed. Available options
|
|
include:
|
|
</para>
|
|
|
|
<variablelist>
|
|
<varlistentry>
|
|
<term><option>-v</option></term>
|
|
<listitem>
|
|
<para>Write a lot of progress messages</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><option>-n</option></term>
|
|
<listitem>
|
|
<para>Don't remove anything, just show what would be done</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><option>-U</option> <replaceable>username</></term>
|
|
<listitem>
|
|
<para>Username to connect as</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><option>-W</option></term>
|
|
<listitem>
|
|
<para>Force prompt for password (generally useless)</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><option>-h</option> <replaceable>hostname</></term>
|
|
<listitem>
|
|
<para>Database server's host</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><option>-p</option> <replaceable>port</></term>
|
|
<listitem>
|
|
<para>Database server's port</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
</variablelist>
|
|
</sect2>
|
|
|
|
<sect2>
|
|
<title>Method</title>
|
|
|
|
<para>
|
|
First, it builds a temporary table which contains all of the OIDs of the
|
|
large objects in that database.
|
|
</para>
|
|
|
|
<para>
|
|
It then scans through all columns in the database that are of type
|
|
<type>oid</> or <type>lo</>, and removes matching entries from the
|
|
temporary table.
|
|
</para>
|
|
|
|
<para>
|
|
The remaining entries in the temp table identify orphaned LOs.
|
|
These are removed.
|
|
</para>
|
|
</sect2>
|
|
|
|
<sect2>
|
|
<title>Author</title>
|
|
|
|
<para>
|
|
Peter Mount <email>peter@retep.org.uk</email>
|
|
</para>
|
|
</sect2>
|
|
|
|
</sect1>
|