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>PostgreSQL 8.4.20 Documentation</TH
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>Appendix F. Additional Supplied Modules</TD
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><H1
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><A
NAME="VACUUMLO"
>F.37. vacuumlo</A
></H1
><A
NAME="AEN121371"
></A
><P
> <SPAN
CLASS="APPLICATION"
>vacuumlo</SPAN
> is a simple utility program that will remove any
<SPAN
CLASS="QUOTE"
>"orphaned"</SPAN
> large objects from a
<SPAN
CLASS="PRODUCTNAME"
>PostgreSQL</SPAN
> database. An orphaned large object (LO) is
considered to be any LO whose OID does not appear in any <TT
CLASS="TYPE"
>oid</TT
> or
<TT
CLASS="TYPE"
>lo</TT
> data column of the database.
</P
><P
> If you use this, you may also be interested in the <CODE
CLASS="FUNCTION"
>lo_manage</CODE
>
trigger in <TT
CLASS="FILENAME"
>contrib/lo</TT
> (see <A
HREF="lo.html"
>Section F.17</A
>).
<CODE
CLASS="FUNCTION"
>lo_manage</CODE
> is useful to try
to avoid creating orphaned LOs in the first place.
</P
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="AEN121384"
>F.37.1. Usage</A
></H2
><PRE
CLASS="SYNOPSIS"
>vacuumlo [options] database [database2 ... databaseN]
</PRE
><P
> All databases named on the command line are processed. Available options
include:
</P
><P
></P
><DIV
CLASS="VARIABLELIST"
><DL
><DT
><TT
CLASS="OPTION"
>-v</TT
></DT
><DD
><P
>Write a lot of progress messages.</P
></DD
><DT
><TT
CLASS="OPTION"
>-n</TT
></DT
><DD
><P
>Don't remove anything, just show what would be done.</P
></DD
><DT
><TT
CLASS="OPTION"
>-U</TT
> <TT
CLASS="REPLACEABLE"
><I
>username</I
></TT
></DT
><DD
><P
>Username to connect as.</P
></DD
><DT
><TT
CLASS="OPTION"
>-w</TT
><BR><TT
CLASS="OPTION"
>--no-password</TT
></DT
><DD
><P
> Never issue a password prompt. If the server requires password
authentication and a password is not available by other means
such as a <TT
CLASS="FILENAME"
>.pgpass</TT
> file, the connection
attempt will fail. This option can be useful in batch jobs and
scripts where no user is present to enter a password.
</P
></DD
><DT
><TT
CLASS="OPTION"
>-W</TT
></DT
><DD
><P
> Force <SPAN
CLASS="APPLICATION"
>vacuumlo</SPAN
> to prompt for a
password before connecting to a database.
</P
><P
> This option is never essential, since
<SPAN
CLASS="APPLICATION"
>vacuumlo</SPAN
> will automatically prompt
for a password if the server demands password authentication.
However, <SPAN
CLASS="APPLICATION"
>vacuumlo</SPAN
> will waste a
connection attempt finding out that the server wants a password.
In some cases it is worth typing <TT
CLASS="OPTION"
>-W</TT
> to avoid the extra
connection attempt.
</P
></DD
><DT
><TT
CLASS="OPTION"
>-h</TT
> <TT
CLASS="REPLACEABLE"
><I
>hostname</I
></TT
></DT
><DD
><P
>Database server's host.</P
></DD
><DT
><TT
CLASS="OPTION"
>-p</TT
> <TT
CLASS="REPLACEABLE"
><I
>port</I
></TT
></DT
><DD
><P
>Database server's port.</P
></DD
></DL
></DIV
></DIV
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="AEN121435"
>F.37.2. Method</A
></H2
><P
> First, it builds a temporary table which contains all of the OIDs of the
large objects in that database.
</P
><P
> It then scans through all columns in the database that are of type
<TT
CLASS="TYPE"
>oid</TT
> or <TT
CLASS="TYPE"
>lo</TT
>, and removes matching entries from the
temporary table.
</P
><P
> The remaining entries in the temp table identify orphaned LOs.
These are removed.
</P
></DIV
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="AEN121442"
>F.37.3. Author</A
></H2
><P
> Peter Mount <CODE
CLASS="EMAIL"
><<A
HREF="mailto:peter@retep.org.uk"
>peter@retep.org.uk</A
>></CODE
>
</P
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