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Commitfc61da7

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Release notes for 9.3.4, 9.2.8, 9.1.13, 9.0.17, 8.4.21.
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‎doc/src/sgml/release-8.4.sgml

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<!-- doc/src/sgml/release-8.4.sgml -->
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<!-- See header comment in release.sgml about typical markup -->
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<sect1 id="release-8-4-21">
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<title>Release 8.4.21</title>
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<note>
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<title>Release Date</title>
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<simpara>2014-03-20</simpara>
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</note>
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<para>
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This release contains a variety of fixes from 8.4.20.
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For information about new features in the 8.4 major release, see
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<xref linkend="release-8-4">.
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</para>
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<para>
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The <productname>PostgreSQL</> community will stop releasing updates
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for the 8.4.X release series in July 2014.
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Users are encouraged to update to a newer release branch soon.
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</para>
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<sect2>
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<title>Migration to Version 8.4.21</title>
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<para>
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A dump/restore is not required for those running 8.4.X.
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</para>
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<para>
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However, if you are upgrading from a version earlier than 8.4.19,
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see <xref linkend="release-8-4-19">.
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</para>
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</sect2>
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<sect2>
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<title>Changes</title>
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<itemizedlist>
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<listitem>
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<para>
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Restore GIN metapages unconditionally to avoid torn-page risk
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(Heikki Linnakangas)
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</para>
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<para>
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Although this oversight could theoretically result in a corrupted
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index, it is unlikely to have caused any problems in practice, since
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the active part of a GIN metapage is smaller than a standard 512-byte
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disk sector.
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</para>
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</listitem>
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<listitem>
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<para>
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Allow regular-expression operators to be terminated early by query
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cancel requests (Tom Lane)
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</para>
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<para>
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This prevents scenarios wherein a pathological regular expression
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could lock up a server process uninterruptably for a long time.
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</para>
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</listitem>
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<listitem>
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<para>
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Remove incorrect code that tried to allow <literal>OVERLAPS</> with
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single-element row arguments (Joshua Yanovski)
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</para>
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<para>
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This code never worked correctly, and since the case is neither
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specified by the SQL standard nor documented, it seemed better to
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remove it than fix it.
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</para>
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</listitem>
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<listitem>
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<para>
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Avoid getting more than <literal>AccessShareLock</> when de-parsing a
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rule or view (Dean Rasheed)
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</para>
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<para>
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This oversight resulted in <application>pg_dump</> unexpectedly
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acquiring <literal>RowExclusiveLock</> locks on tables mentioned as
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the targets of <literal>INSERT</>/<literal>UPDATE</>/<literal>DELETE</>
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commands in rules. While usually harmless, that could interfere with
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concurrent transactions that tried to acquire, for example,
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<literal>ShareLock</> on those tables.
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</para>
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</listitem>
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<listitem>
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<para>
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Prevent interrupts while reporting non-<literal>ERROR</> messages
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(Tom Lane)
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</para>
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<para>
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This guards against rare server-process freezeups due to recursive
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entry to <function>syslog()</>, and perhaps other related problems.
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</para>
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</listitem>
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<listitem>
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<para>
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Update time zone data files to <application>tzdata</> release 2014a
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for DST law changes in Fiji and Turkey, plus historical changes in
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Israel and Ukraine.
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</para>
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<para>
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</para>
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</listitem>
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</itemizedlist>
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</sect2>
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</sect1>
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<sect1 id="release-8-4-20">
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<title>Release 8.4.20</title>
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‎doc/src/sgml/release-9.0.sgml

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<!-- doc/src/sgml/release-9.0.sgml -->
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<!-- See header comment in release.sgml about typical markup -->
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<sect1 id="release-9-0-17">
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<title>Release 9.0.17</title>
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<note>
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<title>Release Date</title>
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<simpara>2014-03-20</simpara>
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</note>
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<para>
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This release contains a variety of fixes from 9.0.16.
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For information about new features in the 9.0 major release, see
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<xref linkend="release-9-0">.
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</para>
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<sect2>
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<title>Migration to Version 9.0.17</title>
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<para>
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A dump/restore is not required for those running 9.0.X.
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</para>
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<para>
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However, if you are upgrading from a version earlier than 9.0.15,
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see <xref linkend="release-9-0-15">.
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</para>
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</sect2>
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<sect2>
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<title>Changes</title>
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<itemizedlist>
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<listitem>
38+
<para>
39+
Restore GIN metapages unconditionally to avoid torn-page risk
40+
(Heikki Linnakangas)
41+
</para>
42+
43+
<para>
44+
Although this oversight could theoretically result in a corrupted
45+
index, it is unlikely to have caused any problems in practice, since
46+
the active part of a GIN metapage is smaller than a standard 512-byte
47+
disk sector.
48+
</para>
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</listitem>
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<listitem>
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<para>
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Avoid race condition in checking transaction commit status during
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receipt of a <command>NOTIFY</> message (Marko Tiikkaja)
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</para>
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<para>
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This prevents a scenario wherein a sufficiently fast client might
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respond to a notification before database updates made by the
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notifier have become visible to the recipient.
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</para>
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</listitem>
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<listitem>
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<para>
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Allow regular-expression operators to be terminated early by query
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cancel requests (Tom Lane)
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</para>
69+
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<para>
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This prevents scenarios wherein a pathological regular expression
72+
could lock up a server process uninterruptably for a long time.
73+
</para>
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</listitem>
75+
76+
<listitem>
77+
<para>
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Remove incorrect code that tried to allow <literal>OVERLAPS</> with
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single-element row arguments (Joshua Yanovski)
80+
</para>
81+
82+
<para>
83+
This code never worked correctly, and since the case is neither
84+
specified by the SQL standard nor documented, it seemed better to
85+
remove it than fix it.
86+
</para>
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</listitem>
88+
89+
<listitem>
90+
<para>
91+
Avoid getting more than <literal>AccessShareLock</> when de-parsing a
92+
rule or view (Dean Rasheed)
93+
</para>
94+
95+
<para>
96+
This oversight resulted in <application>pg_dump</> unexpectedly
97+
acquiring <literal>RowExclusiveLock</> locks on tables mentioned as
98+
the targets of <literal>INSERT</>/<literal>UPDATE</>/<literal>DELETE</>
99+
commands in rules. While usually harmless, that could interfere with
100+
concurrent transactions that tried to acquire, for example,
101+
<literal>ShareLock</> on those tables.
102+
</para>
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</listitem>
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<listitem>
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<para>
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Improve performance of index endpoint probes during planning (Tom Lane)
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</para>
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<para>
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This change fixes a significant performance problem that occurred
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when there were many not-yet-committed rows at the end of the index,
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which is a common situation for indexes on sequentially-assigned
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values such as timestamps or sequence-generated identifiers.
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</para>
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</listitem>
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<listitem>
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<para>
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Fix test to see if hot standby connections can be allowed immediately
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after a crash (Heikki Linnakangas)
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</para>
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</listitem>
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<listitem>
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<para>
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Prevent interrupts while reporting non-<literal>ERROR</> messages
128+
(Tom Lane)
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</para>
130+
131+
<para>
132+
This guards against rare server-process freezeups due to recursive
133+
entry to <function>syslog()</>, and perhaps other related problems.
134+
</para>
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</listitem>
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<listitem>
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<para>
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Prevent intermittent <quote>could not reserve shared memory region</>
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failures on recent Windows versions (MauMau)
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</para>
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</listitem>
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<listitem>
145+
<para>
146+
Update time zone data files to <application>tzdata</> release 2014a
147+
for DST law changes in Fiji and Turkey, plus historical changes in
148+
Israel and Ukraine.
149+
</para>
150+
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<para>
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</para>
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</listitem>
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</itemizedlist>
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</sect2>
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</sect1>
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<sect1 id="release-9-0-16">
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<title>Release 9.0.16</title>
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