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<sect1 id="release-9-0">

<para>

While the Genetic Query Optimizer (GEQO) still selects

random plans, it now selects the same random plans for

identical queries. You can modify <xref

linkend="guc-geqo-seed"> to

randomizethe starting value of the random plan generator.

identical queries. You can modify <link

linkend="guc-geqo-seed">geqo_seed</link> to randomize

the starting value of the random plan generator.

</para>

</listitem>

</para>

<para>

log_*_stats log output, e.g. <xref

linkend="runtime-config-statistics-monitor">, no longer shows

this information.

log_*_stats log output, e.g. <link

linkend="runtime-config-statistics-monitor">log_statement_stats</link>,

no longer showsthis information.

</para>

</listitem>

</para>

<para>

The variable <xref linkend="guc-bytea-output"> controls if hex (default)

or octal escapes are used for <type>bytea</> output. (SWITCH

DEFAULT FOR BETA? PETER) Libpq's <function>PQescapeByteaConn()</>

now uses the hex format for <productname>PostgreSQL</> 9.0 servers.

The variable <link

linkend="guc-bytea-output">bytea_output</link> controls

if hex (default) or octal escapes are used for <type>bytea</>

output. (SWITCH DEFAULT FOR BETA? PETER) Libpq's

<function>PQescapeByteaConn()</> now uses the hex format

for <productname>PostgreSQL</> 9.0 servers.

</para>

</listitem>

<listitem>

<para>

Allow <xref linkend="guc-extra-float-digits"> to be increased to <literal>3</>

(Tom)

Allow <link

linkend="guc-extra-float-digits">extra_float_digits</link>

to be increased to <literal>3</> (Tom)

</para>

<para>

<listitem>

<para>

Add server variable <xref linkend="guc-plperl-on-init"> to specify a PL/Perl

Perl initialization function (Tim Bunce)

Add server variable <link

linkend="guc-plperl-on-init">plperl.on_init</link> to

specify a PL/Perl Perl initialization function (Tim

Bunce)

</para>

<para>

<xref linkend="guc-plperl-on-plperl-init"> and <varname>plperl.on_plperlu_init</>

are also available for trusted/untrusted-specific initialization.

<link

linkend="guc-plperl-on-plperl-init">plperl.on_plperl_init</link>

and <varname>plperl.on_plperlu_init</> are also available

for trusted/untrusted-specific initialization.

</para>

</listitem>

</para>

<para>

This can be enabled with the server variable <xref

linkend="guc-plperl-use-strict">.

This can be enabled with the server variable <link

linkend="guc-plperl-use-strict">plperl.use_strict</link>.

</para>

</listitem>

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