Major enhancements in <productname>PostgreSQL</> 9.6 include:
</para>
- <!-- This list duplicates items below, but without authors or details-->
+ <!-- Items in this list summarize one or more items below -->
<itemizedlist>
<listitem>
<para>
- To be filled in, but see below for the long version
+ Parallel sequential scans, joins and aggregates
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
+ Elimination of repetitive scanning of old data by autovacuum
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
+ Synchronous replication now allows multiple standby servers for
+ increased reliability
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
+ Full-text search for phrases
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
+ Support for remote joins, sorts, and updates
+ in <filename>postgres_fdw</>
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
+ Substantial performance improvements, especially in the area of
+ improving scalability on many-CPU servers
</para>
</listitem>
2016-04-24 [8f91d87d4] Fix documentation & config inconsistencies around 428b1d
2016-04-26 [72a98a639] Don't open formally non-existent segments in _mdfd_getse
2016-05-04 [a71248708] Fix transient mdsync() errors of truncated relations due
+2016-02-16 [7975c5e0a] Allow the WAL writer to flush WAL at a reduced rate.
-->
<para>
Where feasible, trigger kernel writeback after a configurable number
<listitem>
<!--
-2016-02-16 [7975c5e0a] Allow the WAL writer to flush WAL at a reduced rate.
--->
- <para>
- Reduce the WAL writer's flush rate to reduce storage bottlenecks
- (Andres Freund)
- </para>
- </listitem>
-
- <listitem>
-<!--
2016-04-08 [719c84c1b] Extend relations multiple blocks at a time to improve sc
-->
<para>
</para>
<para>
- This reduces kernel traffic and improves scalability when multiple
- processes are inserting into the same relation.
+ This improves scalability by decreasing contention.
</para>
</listitem>
<listitem>
<!--
2016-04-08 [071180377] Use quicksort, not replacement selection, for external s
+2016-03-17 [0011c0091] Improve memory management for external sorts.
-->
<para>
Improve sorting performance by using quicksort, not replacement
</para>
<para>
- This behavior can be adjusted via the new configuration
- parameter <xref linkend="guc-replacement-sort-tuples">.
- </para>
- </listitem>
-
- <listitem>
-<!--
-2016-03-17 [0011c0091] Improve memory management for external sorts.
--->
- <para>
- Improve memory management for external sorts (Peter Geoghegan)
+ The new approach makes better use of CPU cache for typical cache
+ sizes and data volumes. Where necessary, the behavior can be
+ adjusted via the new configuration
+ parameter <xref linkend="guc-replacement-sort-tuples">,
+ which see for further details.
</para>
</listitem>
<listitem>
<!--
2015-11-06 [a76ef15d9] Add sort support routine for the UUID data type.
+2016-02-03 [b47b4dbf6] Extend sortsupport for text to more opclasses.
+2016-02-17 [f1f5ec1ef] Reuse abbreviated keys in ordered [set] aggregates.
-->
<para>
- Speed up sorting of <type>uuid</>-type columns (Peter Geoghegan)
+ Speed up sorting of <type>uuid</>, <type>bytea</>,
+ and <type>char(n)</> fields by using <quote>abbreviated</> keys
+ (Peter Geoghegan)
</para>
- </listitem>
- <listitem>
-<!--
-2015-12-16 [b648b7034] Speed up CREATE INDEX CONCURRENTLY's TID sort.
--->
<para>
- Speed up <command>CREATE INDEX CONCURRENTLY</> by treating TIDs
- as 64-bit integers during the sort phase (Peter Geoghegan)
+ Support for abbreviated keys has also been added to the non-default
+ operator classes <literal>text_pattern_ops</>,
+ <literal>varchar_pattern_ops</>, and <literal>bpchar_pattern_ops</>.
+ Processing of ordered-set aggregates can also now exploit
+ abbreviated keys.
</para>
</listitem>
<listitem>
<!--
-2016-02-17 [f1f5ec1ef] Reuse abbreviated keys in ordered [set] aggregates.
+2015-12-16 [b648b7034] Speed up CREATE INDEX CONCURRENTLY's TID sort.
-->
<para>
- Improve performance of ordered-set aggregates by reusing
- abbreviated-key information (Peter Geoghegan)
+ Speed up <command>CREATE INDEX CONCURRENTLY</> by treating TIDs
+ as 64-bit integers during the sort phase (Peter Geoghegan)
</para>
</listitem>
<listitem>
<!--
+2016-04-06 [989be0810] Support multiple synchronous standby servers.
+2016-04-27 [4c804fbdf] Clean up parsing of synchronous_standby_names GUC variab
+2016-04-30 [17d5db352] Remove warning about num_sync being too large in synchro
+-->
+ <para>
+ Support synchronous replication with multiple synchronous standby
+ servers, not just one (Masahiko Sawada, Beena Emerson, Michael
+ Paquier, Fujii Masao, Kyotaro Horiguchi)
+ </para>
+
+ <para>
+ The number of standby servers that must acknowledge a commit before
+ it's considered done is now configurable.
+ </para>
+ </listitem>
+
+ <listitem>
+<!--
+2016-03-29 [314cbfc5d] Add new replication mode synchronous_commit = 'remote_ap
+-->
+ <para>
+ Add new setting <literal>remote_apply</> for configuration parameter
+ <xref linkend="guc-synchronous-commit"> (Thomas Munro)
+ </para>
+
+ <para>
+ In this mode, the master waits for the transaction to be applied on
+ the standby server, not just written to disk. That means that you
+ can count on a transaction started on the standby to see all commits
+ previously acknowledged by the master.
+ </para>
+ </listitem>
+
+ <listitem>
+<!--
2015-08-11 [6fcd88511] Allow pg_create_physical_replication_slot() to reserve W
2015-09-06 [c314ead5b] Add ability to reserve WAL upon slot creation via replic
-->
</para>
</listitem>
- <listitem>
-<!--
-2016-04-06 [989be0810] Support multiple synchronous standby servers.
-2016-04-27 [4c804fbdf] Clean up parsing of synchronous_standby_names GUC variab
-2016-04-30 [17d5db352] Remove warning about num_sync being too large in synchro
--->
- <para>
- Support synchronous replication with multiple synchronous standby
- servers, not just one (Sawada Masahiko, Beena Emerson, Michael
- Paquier, Fujii Masao, Kyotaro Horiguchi)
- </para>
- </listitem>
-
- <listitem>
-<!--
-2016-03-29 [314cbfc5d] Add new replication mode synchronous_commit = 'remote_ap
--->
- <para>
- Add new setting <literal>remote_apply</> for configuration parameter
- <xref linkend="guc-synchronous-commit"> (Thomas Munro)
- </para>
-
- <para>
- In this mode, the master waits for the transaction to be applied on
- the standby server, not just written to disk. That means that you
- can count on a transaction started on the standby to see all commits
- previously acknowledged by the master.
- </para>
- </listitem>
-
</itemizedlist>
</sect3>
<para>
Add options to <command>ALTER OPERATOR</command> to change the
selectivity functions associated with an existing operator
- (Uriy Zhuravlev)
+ (Yury Zhuravlev)
</para>
</listitem>
<para>
Allow omitting one or both boundaries in an array slice specifier,
for example <literal>array_col[3:]</>
- (YUriy Zhuravlev)
+ (Yury Zhuravlev)
</para>
<para>
2016-04-07 [bb140506d] Phrase full text search.
-->
<para>
- Improve full text search to support searching for phrases, that is,
+ Improve full-text search to support searching for phrases, that is,
lexemes appearing adjacent to each other in a specific order, or with
at most a specified distance between them
(Teodor Sigaev, Oleg Bartunov, Dmitry Ivanov)
</para>
<para>
- These are <function>delete()</>, <function>filter()</>,
+ These are <function>ts_delete()</>, <function>ts_filter()</>,
<function>unnest()</>, <function>tsvector_to_array()</>,
<function>array_to_tsvector()</>, and a variant
of <function>setweight()</> that sets the weight only for specified
-->
<para>
Add <function>pg_size_bytes()</> function to convert human-readable
- size strings to numbers (Pavel Stehule, Vitaly Burovoy)
+ size strings to numbers (Pavel Stehule, Vitaly Burovoy, Dean Rasheed)
</para>
<para>
2016-05-05 [7a622b273] Rename pgbench min/max to least/greatest, and fix handli
-->
<para>
- Support some <link linkend="pgbench-builtin-functions">built-in
- functions</> in expressions in backslash commands (Fabien Coelho)
+ Support floating-point arithmetic, as well as
+ some <link linkend="pgbench-builtin-functions">built-in functions</>,
+ in expressions in backslash commands (Fabien Coelho)
</para>
</listitem>
<listitem>
<!--
-2016-02-03 [b47b4dbf6] Extend sortsupport for text to more opclasses.
--->
- <para>
- Generalize the SortSupport for <type>text</> so that it can be
- used by other types such as <type>bpchar</> (Peter Geoghegan)
- </para>
- </listitem>
-
- <listitem>
-<!--
2016-02-04 [c1772ad92] Change the way that LWLocks for extensions are allocated
-->
<para>
-->
<para>
Add selectivity estimation functions for <filename>contrib/intarray</>
- operators, to improve plans for queries using those operators (Uriy
+ operators, to improve plans for queries using those operators (Yury
Zhuravlev, Alexander Korotkov)
</para>
</listitem>
<listitem>
<!--
-2016-01-28 [96198d94c] Avoid multiple foreign server connections when all use s
--->
- <para>
- Use a single foreign-server connection for local user IDs that all
- map to the same remote user (Ashutosh Bapat)
- </para>
- </listitem>
-
- <listitem>
-<!--
-2016-02-03 [dc203dc3a] postgres_fdw: Allow fetch_size to be set per-table or pe
--->
- <para>
- Allow the fetch size to be set as a server or table option
- (Corey Huinker)
- </para>
-
- <para>
- Formerly, <filename>postgres_fdw</> always fetched 100 rows at a time
- from remote queries; now that behavior is adjustable.
- </para>
- </listitem>
-
- <listitem>
-<!--
2015-11-03 [f18c944b6] postgres_fdw: Add ORDER BY to some remote SQL queries.
2015-12-22 [ccd8f9792] postgres_fdw: Consider requesting sorted data so we can
-->
<listitem>
<!--
+2016-02-03 [dc203dc3a] postgres_fdw: Allow fetch_size to be set per-table or pe
+-->
+ <para>
+ Allow the fetch size to be set as a server or table option
+ (Corey Huinker)
+ </para>
+
+ <para>
+ Formerly, <filename>postgres_fdw</> always fetched 100 rows at a time
+ from remote queries; now that behavior is adjustable.
+ </para>
+ </listitem>
+
+ <listitem>
+<!--
+2016-01-28 [96198d94c] Avoid multiple foreign server connections when all use s
+-->
+ <para>
+ Use a single foreign-server connection for local user IDs that all
+ map to the same remote user (Ashutosh Bapat)
+ </para>
+ </listitem>
+
+ <listitem>
+<!--
2016-04-21 [f039eaac7] Allow queries submitted by postgres_fdw to be canceled.
-->
<para>
projects / postgresql / commitdiff