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>Chapter 31. Large Objects</H1
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>31.1. <A
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>Introduction</A
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>31.2. <A
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>Implementation Features</A
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>31.3.1. <A
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>Creating a Large Object</A
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>31.3.2. <A
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>Importing a Large Object</A
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>Exporting a Large Object</A
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>31.3.4. <A
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>Opening an Existing Large Object</A
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>31.3.5. <A
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>Writing Data to a Large Object</A
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>Reading Data from a Large Object</A
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>Seeking in a Large Object</A
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>31.3.8. <A
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>Obtaining the Seek Position of a Large Object</A
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>Truncating a Large Object</A
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>Closing a Large Object Descriptor</A
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>Removing a Large Object</A
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><P
>    <SPAN
CLASS="PRODUCTNAME"
>PostgreSQL</SPAN
> has a <I
CLASS="FIRSTTERM"
>large object</I
>
    facility, which provides stream-style access to user data that is stored
    in a special large-object structure.  Streaming access is useful
    when working with data values that are too large to manipulate
    conveniently as a whole.
   </P
><P
>    This chapter describes the implementation and the programming and
    query language interfaces to <SPAN
CLASS="PRODUCTNAME"
>PostgreSQL</SPAN
>
    large object data.  We use the <SPAN
CLASS="APPLICATION"
>libpq</SPAN
> C
    library for the examples in this chapter, but most programming
    interfaces native to <SPAN
CLASS="PRODUCTNAME"
>PostgreSQL</SPAN
> support
    equivalent functionality.  Other interfaces might use the large
    object interface internally to provide generic support for large
    values.  This is not described here.
   </P
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