PostgreSQL has a large object 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. This chapter describes the implementation and the
programming and query language interfaces to PostgreSQL large
object data. We use the libpq C library for the examples in this
chapter, but most programming interfaces native to PostgreSQL
support equivalent functionality. Other interfaces might use the
large object interface internally to provide generic support for
large values. This is not described here.