| PostgreSQL 9.1.14 Documentation | ||||
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    All large objects are placed in a single system table called
    pg_largeobject.
    PostgreSQL also supports a storage system called
    "TOAST" that automatically stores values
    larger than a single database page into a secondary storage area per table.
    This makes the large object facility partially obsolete.  One
    remaining advantage of the large object facility is that it allows values
    up to 2 GB in size, whereas TOASTed fields can be at
    most 1 GB.  Also, large objects can be randomly modified using a read/write
    API that is more efficient than performing such operations using
    TOAST.