$PostgreSQL: pgsql/doc/src/sgml/release.sgml,v 1.375 2005/09/24 20:35:21 tgl Exp $

<listitem>

<para>

Read-only large object descriptors now obey MVCC snapshot semantics

</para>

<para>

When a large object is opened with <literal>INV_READ</> (and not

<literal>INV_WRITE</>), the data read from the descriptor will now

reflect a <quote>snapshot</> of the large object's state at the

time of the transaction snapshot in use by the query that called

<function>lo_open()</>. To obtain the old behavior of always

returning the latest committed data, include <literal>INV_WRITE</>

in the mode flags for <function>lo_open()</>.

</para>

</listitem>