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Commit2a49282

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Update release notes from community comments.
1 parentf9989da commit2a49282

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‎doc/src/sgml/release.sgml‎

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<!--
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$PostgreSQL: pgsql/doc/src/sgml/release.sgml,v 1.338 2005/08/2302:57:07 momjian Exp $
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$PostgreSQL: pgsql/doc/src/sgml/release.sgml,v 1.339 2005/08/2311:32:33 momjian Exp $
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-->
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<appendix id="release">
@@ -36,7 +36,7 @@ $PostgreSQL: pgsql/doc/src/sgml/release.sgml,v 1.338 2005/08/23 02:57:07 momjian
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</sect2>
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<sect2>
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<title>Migration to version 8.0</title>
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<title>Migration to version 8.1</title>
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<para>
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A dump/restore using <application>pg_dump</application> is
@@ -56,6 +56,16 @@ $PostgreSQL: pgsql/doc/src/sgml/release.sgml,v 1.338 2005/08/23 02:57:07 momjian
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<itemizedlist>
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<listitem>
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<para>
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Change add_missing_from to 'false'
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</para>
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<para>
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Generate an error if a table used in a query without a FROM reference (Neil)
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No more SELECT pg_class.*;
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</para>
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</listitem>
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<listitem>
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<para>
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Cause input of a zero-length string ('') for float4/float8/oid to throw
@@ -67,6 +77,21 @@ $PostgreSQL: pgsql/doc/src/sgml/release.sgml,v 1.338 2005/08/23 02:57:07 momjian
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</para>
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</listitem>
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<listitem>
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<para>
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Make default_with_oids default to false (Neil)
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</para>
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<para>
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With this option set to false, user-created tables no
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have an the usually-invisible OID column unless WITH OIDS
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is specified in CREATE TABLE. Though OIDs have existed in all previous
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releases of PostgreSQL, their use is limited because they are only four
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bytes long and the counter is unique across all installed databases.
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The preferred way of uniquely identifying rows is via sequences and
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SERIAL, which has been supported since PostgreSQL 6.4.
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</para>
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</listitem>
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<listitem>
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<para>
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In psql, treat unquoted \{digit}+ sequences as octal (Bruce)
@@ -146,7 +171,7 @@ $PostgreSQL: pgsql/doc/src/sgml/release.sgml,v 1.338 2005/08/23 02:57:07 momjian
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</para>
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<para>
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In previous releases, the only way to use index for MIN/MAX was to rewrite
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the query as SELECT col FROM tab ORDER BY col LIMIT 1.Thisnot happens
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the query as SELECT col FROM tab ORDER BY col LIMIT 1. Thisnow happens
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automatically.
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</para>
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</listitem>
@@ -157,15 +182,26 @@ $PostgreSQL: pgsql/doc/src/sgml/release.sgml,v 1.338 2005/08/23 02:57:07 momjian
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single query (Tom)
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</para>
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<para>
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Multiple AND and ORs
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This allows multiple indexes to be combined to access a single
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table.
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</para>
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</listitem>
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<listitem>
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<para>
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Change WAL CRC records from 64bit to 32bit to improve performance
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(Tom)
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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 writing large empty gaps in WAL pages (Tom)
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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 non-consecutive index columns to be used in a multi-column index
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(Tom)
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</para>
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<listitem>
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<para>
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Allow concurrent GIST index access, greatly improving performance
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(Teodor)
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(Teodor, Oleg)
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</para>
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</listitem>
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<listitem>
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<para>
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Add GUC full_page_writes to control writing full pages to WAL (Bruce)
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</para>
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<para>
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To prevent partial disk writes from corrupting the database,
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PostgreSQL writes a complete copy of each database disk page to WAL
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the first time it is modified after a checkpoint.This turnsof that
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the first time it is modified after a checkpoint. This turnsoff that
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functionality for users with battery-backed disk caches where partial
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page writes can not happen.
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</para>
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<para>
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O_DIRECT causes disk writes to bypass the kernel cache, and for WAL
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writes, this improves performance.
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</para>
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</listitem>
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<listitem>
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<para>
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Improve COPY FROM performance (Alon Goldshuv)
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</para>
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<para>
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<listitem>
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<para>
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Add session start time and client IP address to pg_stat_activity (Magnus)
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</para>
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</listitem>
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<listitem>
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<para>
270320
Enhance pg_locks display (Tom)
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</para>
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</listitem>
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<listitem>
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<para>
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Add WAL logging for GIST indexes (Teodor)
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Add WAL logging for GIST indexes (Teodor, Oleg)
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</para>
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<para>
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GIST indexes now work for online backup and crash recovery
@@ -315,9 +365,6 @@ $PostgreSQL: pgsql/doc/src/sgml/release.sgml,v 1.338 2005/08/23 02:57:07 momjian
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<para>
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Remove old *.backup files when we do pg_stop_backup() (Bruce)
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</para>
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</listitem>
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<listitem>
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<para>
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This prevents a large number of *.backup files from existing in
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pg_xlog/.
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</para>
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</listitem>
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<listitem>
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<para>
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Change add_missing_from to 'false'
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</para>
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<para>
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Generate an error if a table used in a query without a FROM reference (Neil)
400-
No more SELECT pg_class.*;
401-
</para>
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</listitem>
403-
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<listitem>
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<para>
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Add support for \x hex escapes in backend and ecpg strings (Bruce)
@@ -488,21 +525,6 @@ $PostgreSQL: pgsql/doc/src/sgml/release.sgml,v 1.338 2005/08/23 02:57:07 momjian
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<title>Object Manipulation Changes</title>
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<itemizedlist>
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491-
<listitem>
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<para>
493-
Make default_with_oids default to false (Neil)
494-
</para>
495-
<para>
496-
With this option set to false, user-created tables no
497-
have an the usually-invisible OID column unless WITH OIDS
498-
is specified in CREATE TABLE. Though OIDs have existed in all previous
499-
releases of PostgreSQL, their use is limited because they are only four
500-
bytes long and the counter is unique across all installed databases.
501-
The preferred way of uniquely identifying rows is via sequences and
502-
SERIAL, which has been supported since PostgreSQL 6.4.
503-
</para>
504-
</listitem>
505-
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<listitem>
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<para>
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Track dependencies of shared objects (Alvaro)
@@ -567,7 +589,7 @@ $PostgreSQL: pgsql/doc/src/sgml/release.sgml,v 1.338 2005/08/23 02:57:07 momjian
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</para>
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<para>
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In release 8.0, carriage returns and line feeds in CSV COPY TO were
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notprocessed ina inconsitent manner. (This was documented on the TODO
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processed inan inconsistent manner. (This was documented on the TODO
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list.)
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</para>
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</listitem>
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to use "postgres" rather than "template1" for standard lookups (Dave)
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</para>
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<para>
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In prior releases, template1 was used both as a default connection for
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thingslike createuser, and as a template for new databases. This
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caused CREATE DATABASE to sometimes fail because a new database can
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notbe created if anyone else is in the template database. With this
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change,thedefault connectiondatabase is now 'postgres', meaning is
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ismuch less likely someone will be using template1 during CREATE
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DATABASE.
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In prior releases, template1 was used both as a default
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connection for utilitieslike createuser, and as a template for
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new databases. Thiscaused CREATE DATABASE to sometimes fail
669+
because a new database cannotbe created if anyone else is in
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thetemplatedatabase. With this change, the default connection
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databaseisnow 'postgres', meaning it is much less likely
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someone will be using template1 during CREATEDATABASE.
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</para>
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</listitem>
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This allows regular expression replacement, like sed. A four-argument
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version also allows for global (replace all) and case-insensitive
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modes.
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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 interval division and multiplication (Bruce)
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</para>
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<para>
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<listitem>
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<para>
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Move /contrib/dbsize into the backend, and rename some of the functions
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(Dave Page)
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(Dave Page, Andreas Pflug)
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</para>
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<para>
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The new functions are:
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</para>
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</listitem>
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<listitem>
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<para>
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pg_tablespace_size()
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pg_database_size()
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pg_relation_size()
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<sect3>
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<title>PL/Perl Server-Side Language Changes</title>
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<itemizedlist>
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<listitem>
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<para>
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Allow large result sets to be returned efficiently (Abhijit Menon-Sen)
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</para>
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<para>
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This allows functions to use return_next() to avoid building
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the entire result set in memory.
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</para>
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</listitem>
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<listitem>
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<para>
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Allowthe return large result sets (Abhijit Menon-Sen)
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Allowone-row-at-a-time retrieval of query results (Abhijit)
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</para>
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<para>
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This allowsPL/Perl to use spi_query(),spi_fetchrow(), and
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return_next() to return one row at a time from the function.
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This allowsfunctions to use spi_query() andspi_fetchrow() to
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avoid accumulating the entire result set in memory.
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</para>
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</listitem>
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