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- <!-- $PostgreSQL: pgsql/doc/src/sgml/release.sgml,v 1.525 2007/10/18 16:47:58 momjian Exp $ -->
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+ <!-- $PostgreSQL: pgsql/doc/src/sgml/release.sgml,v 1.526 2007/10/18 23:05:06 momjian Exp $ -->
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@@ -66,8 +66,8 @@ do it for earlier branch release files.
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<listitem>
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<para>
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- Support for the SQL/XML standard, including new operators and a
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- new <type>XML</type> builtin type
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+ Support for the SQL/XML standard, including new operators and
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+ an <type>XML</type> data type
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</para>
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</listitem>
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@@ -79,8 +79,7 @@ do it for earlier branch release files.
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<listitem>
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<para>
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- Universally Unique Identifier (<type>UUID</>) data type, similar
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- to that defined by RFC 4122
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+ Universally Unique Identifier (<type>UUID</>) data type
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</para>
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</listitem>
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@@ -171,28 +170,27 @@ do it for earlier branch release files.
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<listitem>
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<para>
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- <quote>Distributed</> checkpoints prevent I/O spikes during
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- checkpoints
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+ Distributed checkpoints prevent I/O spikes during checkpoints
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</para>
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</listitem>
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<para>
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- Heap-Only Tuples (<acronym>HOT</>) improves <command>UPDATE</>
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- space usage
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+ Heap-Only Tuples (<acronym>HOT</>) accelerate <command>UPDATE</>
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+ space reuse
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</para>
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- Just-in-time background writer strategy to improve disk write
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+ Just-in-time background writer strategy improves disk write
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efficiency
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- Reduction of both per-field and per-row storage requirements
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+ Reduction of per-field and per-row storage requirements
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<para>
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- Use pseudo-transaction ids in read-only transactions
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+ Reduce need for vacuum by using pseudo-transaction ids in
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+ read-only transactions
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@@ -507,7 +506,7 @@ do it for earlier branch release files.
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<para>
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- <quote> Distributed</> checkpoints prevent I/O spikes during
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+ Distributed checkpoints prevent I/O spikes during
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checkpoints (Itagaki Takahiro and Heikki Linnakangas)
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</para>
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<para>
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- Heap-Only Tuples (<acronym>HOT</>) improves <command>UPDATE</>
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- space usage (Pavan Deolasee, with ideas from many others)
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+ Heap-Only Tuples (<acronym>HOT</>) accelerate <command>UPDATE</>
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+ space reuse (Pavan Deolasee, with ideas from many others)
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</para>
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<para>
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- Just-in-time background writer strategy to improve disk write
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+ Just-in-time background writer strategy improves disk write
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efficiency (Greg Smith, Itagaki Takahiro)
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</para>
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@@ -551,8 +550,8 @@ do it for earlier branch release files.
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<listitem>
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- Reduction of both per-field and per-row storage requirements
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- (Greg Stark)
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+ Reduction of per-field and per-row storage requirements (Greg
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+ Stark)
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</para>
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<para>
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<para>
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- Use pseudo-transaction ids in read-only transactions (Florian Pflug)
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+ Reduce need for vacuum by using pseudo-transaction ids in
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+ read-only transactions (Florian Pflug)
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</para>
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- This reduces transaction overhead for read-only transactions,
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- and reduces the necessity of vacuuming for transaction id
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- wrap-around. Other transaction performance improvements were
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- also made that should improve concurrency.
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+ Pseudo-transaction ids do not increment the global transaction
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+ counter. Therefore, they do not add to the need for vacuum to
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+ read all database rows to prevent problems with transaction id
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+ wrap-around. Other transaction performance improvements were also
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+ made that should improve concurrency.
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</para>
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<para>
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Create a dedicated <acronym>WAL</> writer process to off-load
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- WAL-writing work from backends (Simon)
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+ work from backends (Simon)
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</para>
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@@ -619,12 +620,6 @@ do it for earlier branch release files.
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</para>
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- <listitem>
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- Reduce overhead of populating the statistics tables. (Tom)
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-
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Allow <literal>ORDER BY ... LIMIT</> to be done without sorting
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</para>
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+ <listitem>
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+ <para>
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+ Reduce overhead of populating the statistics tables (Tom)
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+ </para>
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+ </listitem>
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+
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Improve hash join performance for cases with many NULLs (Tom)
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<listitem>
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<para>
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- Support for the SQL/XML standard, including new operators and a
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- new <type>XML</type> builtin type (Nikolay Samokhvalov, Peter)
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+ Support for the SQL/XML standard, including new operators and an
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+ <type>XML</type> data type (Nikolay Samokhvalov, Peter)
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</para>
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<listitem>
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<para>
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- Universally Unique Identifier (<type>UUID</>) data type, similar
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- to that defined by RFC 4122 (Gevik Babakhani, Neil)
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+ Universally Unique Identifier (<type>UUID</>) data type (Gevik
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+ Babakhani, Neil)
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+ </para>
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+
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+ <para>
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+ This closely matches <acronym>RFC</> 4122.
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</para>
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