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Since some preparation work had already been done, the only source changes left were changing empty-element tags like <xref linkend="foo"> to <xref linkend="foo"/>, and changing the DOCTYPE. The source files are still named *.sgml, but they are actually XML files now. Renaming could be considered later. In the build system, the intermediate step to convert from SGML to XML is removed. Everything is build straight from the source files again. The OpenSP (or the old SP) package is no longer needed. The documentation toolchain instructions are updated and are much simpler now. Peter Eisentraut, Alexander Lakhin, Jürgen Purtz
194 lines
5.6 KiB
Plaintext
194 lines
5.6 KiB
Plaintext
<!-- doc/src/sgml/vacuumlo.sgml -->
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<refentry id="vacuumlo">
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<indexterm zone="vacuumlo">
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<primary>vacuumlo</primary>
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</indexterm>
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<refmeta>
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<refentrytitle><application>vacuumlo</application></refentrytitle>
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<manvolnum>1</manvolnum>
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<refmiscinfo>Application</refmiscinfo>
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</refmeta>
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<refnamediv>
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<refname>vacuumlo</refname>
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<refpurpose>remove orphaned large objects from a <productname>PostgreSQL</productname> database</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<cmdsynopsis>
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<command>vacuumlo</command>
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<arg choice="opt" rep="repeat"><replaceable>option</replaceable></arg>
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<arg choice="plain" rep="repeat"><replaceable>dbname</replaceable></arg>
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</cmdsynopsis>
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</refsynopsisdiv>
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<refsect1>
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<title>Description</title>
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<para>
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<application>vacuumlo</application> is a simple utility program that will remove any
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<quote>orphaned</quote> large objects from a
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<productname>PostgreSQL</productname> database. An orphaned large object (LO) is
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considered to be any LO whose OID does not appear in any <type>oid</type> or
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<type>lo</type> data column of the database.
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</para>
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<para>
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If you use this, you may also be interested in the <function>lo_manage</function>
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trigger in the <xref linkend="lo"/> module.
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<function>lo_manage</function> is useful to try
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to avoid creating orphaned LOs in the first place.
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</para>
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<para>
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All databases named on the command line are processed.
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</para>
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</refsect1>
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<refsect1>
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<title>Options</title>
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<para>
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<application>vacuumlo</application> accepts the following command-line arguments:
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<variablelist>
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<varlistentry>
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<term><option>-l</option> <replaceable>limit</replaceable></term>
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<listitem>
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<para>
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Remove no more than <replaceable>limit</replaceable> large objects per
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transaction (default 1000). Since the server acquires a lock per LO
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removed, removing too many LOs in one transaction risks exceeding
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<xref linkend="guc-max-locks-per-transaction"/>. Set the limit to
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zero if you want all removals done in a single transaction.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-n</option></term>
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<listitem>
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<para>Don't remove anything, just show what would be done.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-v</option></term>
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<listitem>
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<para>Write a lot of progress messages.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-V</option></term>
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<term><option>--version</option></term>
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<listitem>
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<para>
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Print the <application>vacuumlo</application> version and exit.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-?</option></term>
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<term><option>--help</option></term>
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<listitem>
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<para>
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Show help about <application>vacuumlo</application> command line
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arguments, and exit.
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</para>
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<para>
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<application>vacuumlo</application> also accepts the following command-line
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arguments for connection parameters:
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<variablelist>
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<varlistentry>
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<term><option>-h</option> <replaceable>hostname</replaceable></term>
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<listitem>
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<para>Database server's host.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-p</option> <replaceable>port</replaceable></term>
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<listitem>
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<para>Database server's port.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-U</option> <replaceable>username</replaceable></term>
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<listitem>
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<para>User name to connect as.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-w</option></term>
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<term><option>--no-password</option></term>
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<listitem>
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<para>
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Never issue a password prompt. If the server requires password
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authentication and a password is not available by other means
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such as a <filename>.pgpass</filename> file, the connection
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attempt will fail. This option can be useful in batch jobs and
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scripts where no user is present to enter a password.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-W</option></term>
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<listitem>
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<para>
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Force <application>vacuumlo</application> to prompt for a
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password before connecting to a database.
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</para>
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<para>
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This option is never essential, since
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<application>vacuumlo</application> will automatically prompt
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for a password if the server demands password authentication.
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However, <application>vacuumlo</application> will waste a
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connection attempt finding out that the server wants a password.
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In some cases it is worth typing <option>-W</option> to avoid the extra
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connection attempt.
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</para>
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</refsect1>
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<refsect1>
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<title>Notes</title>
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<para>
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<application>vacuumlo</application> works by the following method:
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First, <application>vacuumlo</application> builds a temporary table which contains all
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of the OIDs of the large objects in the selected database. It then scans
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through all columns in the database that are of type
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<type>oid</type> or <type>lo</type>, and removes matching entries from the temporary
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table. (Note: Only types with these names are considered; in particular,
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domains over them are not considered.) The remaining entries in the
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temporary table identify orphaned LOs. These are removed.
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</para>
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</refsect1>
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<refsect1>
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<title>Author</title>
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<para>
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Peter Mount <email>peter@retep.org.uk</email>
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</para>
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</refsect1>
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</refentry>
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