75 lines
1.9 KiB
Plaintext
75 lines
1.9 KiB
Plaintext
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<sect1 id="vacuumlo">
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<title>vacuumlo</title>
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<indexterm zone="vacuumlo">
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<primary>vacuumlo</primary>
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</indexterm>
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<para>
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This is a simple utility that will remove any orphaned large objects out of a
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PostgreSQL database. An orphaned LO is considered to be any LO whose OID
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does not appear in any OID 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 lo_manage trigger in
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contrib/lo. lo_manage is useful to try to avoid creating orphaned LOs
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in the first place.
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</para>
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<para>
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<note>
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<para>
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It was decided to place this in contrib as it needs further testing, but hopefully,
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this (or a variant of it) would make it into the backend as a "vacuum lo"
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command in a later release.
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</para>
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</note>
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</para>
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<sect2>
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<title>Usage</title>
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<programlisting>
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vacuumlo [options] database [database2 ... databasen]
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</programlisting>
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<para>
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All databases named on the command line are processed. Available options
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include:
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</para>
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<programlisting>
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-v Write a lot of progress messages
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-n Don't remove large objects, just show what would be done
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-U username Username to connect as
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-W Prompt for password
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-h hostname Database server host
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-p port Database server port
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</programlisting>
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</sect2>
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<sect2>
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<title>Method</title>
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<para>
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First, it builds a temporary table which contains all of the OIDs of the
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large objects in that database.
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</para>
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<para>
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It then scans through all columns in the database that are of type "oid"
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or "lo", and removes matching entries from the temporary table.
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</para>
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<para>
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The remaining entries in the temp table identify orphaned LOs. These are
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removed.
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</para>
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</sect2>
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<sect2>
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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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<para>
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<ulink url="http://www.retep.org.uk"></ulink>
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</para>
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</sect2>
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</sect1>
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