PostgreSQL 9.2.12 Documentation
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# 32.2. Implementation Features

The large object implementation breaks large objects up into "chunks" and stores the chunks in rows in the database. A B-tree index guarantees fast searches for the correct chunk number when doing random access reads and writes.

As of PostgreSQL 9.0, large objects have an owner and a set of access permissions, which can be managed using GRANT and REVOKE. For compatibility with prior releases, see lo_compat_privileges. `SELECT` privileges are required to read a large object, and `UPDATE` privileges are required to write to or truncate it. Only the large object owner (or the database superuser) can unlink, comment on, or change the owner of a large object.

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