-<!-- $PostgreSQL: pgsql/doc/src/sgml/release.sgml,v 1.545 2007/11/19 03:47:14 tgl Exp $ -->
+<!-- $PostgreSQL: pgsql/doc/src/sgml/release.sgml,v 1.546 2007/11/20 01:13:00 momjian Exp $ -->
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<listitem>
<para>
- Distributed checkpoints prevent checkpoint I/O spikes
+ Distributed checkpoints prevent checkpoint I/O spikes
</para>
</listitem>
<listitem>
<para>
- Using non-persistent transaction IDs for
- read-only transactions reduces overhead
+ Using non-persistent transaction IDs for read-only transactions
+ reduces overhead
</para>
</listitem>
<listitem>
<para>
- Per-field and per-row storage overhead have been reduced
+ Per-field and per-row storage overhead has been reduced
</para>
</listitem>
<listitem>
<para>
- Reduce overhead by using non-persistent transaction IDs for
- read-only transactions (Florian Pflug)
+ Using non-persistent transaction IDs for read-only transactions
+ reduces overhead (Florian Pflug)
</para>
<para>
<listitem>
<para>
- Prevent large sequential scans from forcing out more frequently
- used cached pages (Simon, Heikki, Tom)
+ Large sequential scans no longer force out frequently used
+ cached pages (Simon, Heikki, Tom)
</para>
</listitem>
<listitem>
<para>
- Allow large sequential scans to use cached pages from other
+ Large sequential scans can share disk reads with other
concurrent sequential scans (Jeff Davis)
</para>
<listitem>
<para>
- Allow <literal>ORDER BY ... LIMIT</> to be done without sorting
+ <literal>ORDER BY ... LIMIT</> can be done without sorting
(Greg Stark)
</para>
</para>
<para>
- This reduces overhead for short transactions, but may sometimes
+ This reduces overhead for short transactions, but might sometimes
increase the delay before statistics are tallied.
</para>
</listitem>
<listitem>
<para>
- Support updatable cursors (Arul Shaji, Tom)
+ Updatable cursors (Arul Shaji, Tom)
</para>
<para>
Create a general mechanism that supports casts to and from the
standard string types (<type>TEXT</type>, <type>VARCHAR</type>,
<type>CHAR</type>) for <emphasis>every</emphasis> datatype, by
- invoking the datatype's I/O functions (Tom)
+ invoking the datatype's I/O functions (Tom) XXX examples?
</para>
<para>
comparisons, if the data types have compatible hash functions.
Currently, cross-data-type hashing support exists for
<type>smallint</type>/<type>integer</type>/<type>bigint</type>,
- and for <type>float4</type>/<type>float8</type>.
+ and for <type>float4</type>/<type>float8</type>. XXX how do you do
+ hash aggregate two different data types
</para>
</listitem>
<listitem>
<para>
- Improve performance when planning large inheritance trees in which
- most tables are excluded by constraints (Tom)
+ Improve performance when planning large inheritance trees in
+ cases where most tables are excluded by constraints (Tom)
</para>
</listitem>
<listitem>
<para>
- Add <literal>COST</literal> and <literal>ROWS</literal> options to
- <command>CREATE/ALTER FUNCTION</command> (Tom)
+ <command>CREATE/ALTER FUNCTION</command> now supports
+ <literal>COST</literal> and <literal>ROWS</literal> options (Tom)
</para>
<para>
- This allows simple control over the estimated cost of a function
- call and over the estimated number of rows returned by a
- set-returning function.
+ <literal>COST</literal> allows specification of the cost of a
+ function call. <literal>ROWS</literal> allows specification of
+ the average number or rows returned by a set-returning function.
+ These values are used by the optimizer in choosing the best plan.
</para>
</listitem>
</para>
<para>
- This allows a user-defined type to take a modifier, as in
+ This allows a user-defined type to take a modifier, like
<type>ssnum(7)</>. Previously only
predefined system data types could have modifiers.
</para>
<listitem>
<para>
- Non-superuser database owners now have privileges to add trusted
- procedural languages in their databases by default (Jeremy Drake)
+ Non-superuser database owners now are able to add trusted procedural
+ languages to their databases by default (Jeremy Drake)
</para>
<para>
- While this is reasonably safe, some administrators may wish to
+ While this is reasonably safe, some administrators might wish to
revoke the privilege. It is controlled by
<structname>pg_pltemplate</>.<structfield>tmpldbacreate</>.
</para>
<para>
Formerly, <command>CLUSTER</command> would discard all tuples
that were committed dead, even if there were still transactions
- that should be able to see them under the MVCC visibility rules.
+ that should be able to see them under MVCC visibility rules.
</para>
</listitem>
<listitem>
<para>
- Fix <command>EXPLAIN</command> so it can show more complex plans
- accurately (Tom)
+ Fix <command>EXPLAIN</command> so it can show complex plans
+ more accurately (Tom)
</para>
<para>
References to subplan outputs are now always shown correctly,
instead of using <literal>?column<replaceable>N</>?</literal>
- when things got too complicated.
+ for complicated cases.
</para>
</listitem>
</para>
<para>
- Formerly, these commands accepted <quote>schema.relation</> but
+ Formerly, these commands accepted <literal>schema.relation</> but
ignored the schema part, which was confusing.
</para>
</listitem>
<listitem>
<para>
- Add Universally Unique Identifier (<type>UUID</>) data type (Gevik
+ Universally Unique Identifier (<type>UUID</>) data type (Gevik
Babakhani, Neil)
</para>
<listitem>
<para>
- Add new regexp functions <function>regexp_matches()</function>,
+ Add new regular expression functions
+ <function>regexp_matches()</function>,
<function>regexp_split_to_array()</function>, and
<function>regexp_split_to_table()</function> (Jeremy Drake, Neil)
</para>
<para>
- These functions provide extraction of regexp subexpressions
- and allow splitting a string using a POSIX
- regular expression.
+ These functions provide extraction of regular expression
+ subexpressions and allow splitting a string using a POSIX regular
+ expression.
</para>
</listitem>
<listitem>
<para>
- Add <function>lo_truncate()</function> function for large object
- truncation (Kris Jurka)
+ Add <function>lo_truncate()</function> for large object truncation
+ (Kris Jurka)
</para>
</listitem>
</para>
<para>
- The first request for statistics in a transaction takes a
- statistics snapshot that doesn't change during the transaction.
- This function allows the snapshot to be discarded and a new
- snapshot loaded during the next statistics query. This is
- particularly useful for PL/PgSQL functions which are confined to
- a single transaction.
+ The first request for statistics in a transaction takes a statistics
+ snapshot that does not change during the transaction. This function
+ allows the snapshot to be discarded and a new snapshot loaded during
+ the next statistics query. This is particularly useful for PL/PgSQL
+ functions which are confined to a single transaction.
</para>
</listitem>
<para>
Add <literal>ID</> (ISO day of week) and <literal>IDDD</> (ISO
day of year) format codes for <function>to_char()</>,
- <function>to_date()</> and <function>to_timestamp()</> (Brendan
+ <function>to_date()</>, and <function>to_timestamp()</> (Brendan
Jurd)
</para>
</listitem>
<listitem>
<para>
- Fix off-by-one conversion in
+ Fix off-by-one conversion error in
<function>to_date()</function>/<function>to_timestamp()</function>
- <literal>D</> fields
- (Bruce)
+ <literal>D</> (non-ISO day of week) fields (Bruce)
</para>
</listitem>
<listitem>
<para>
Fix <type>float4</type>/<type>float8</type> to handle
- <literal>Infinity</> and <literal>NAN</> (not a number)
+ <literal>Infinity</> and <literal>NAN</> (Not A Number)
consistently (Bruce)
</para>
</sect3>
<sect3>
- <title>PL/Perl Server-Side Language Changes</title>
+ <title>Changes to Other Server-Side Languages</title>
<itemizedlist>
<listitem>
<para>
- Allow type-name arguments to <function>spi_prepare()</function> to
- be data type aliases in addition to names in
- <literal>pg_type</literal> (Andrew)
+ Allow type-name arguments to PL/Perl
+ <function>spi_prepare()</function> to be data type aliases in
+ addition to names in <literal>pg_type</literal> (Andrew)
</para>
</listitem>
- </itemizedlist>
-
- </sect3>
-
- <sect3>
- <title>PL/Python Server-Side Language Changes</title>
- <itemizedlist>
-
<listitem>
<para>
- Enable PL/PythonU to compile on Python 2.5 (Marko Kreen)
+ Allow type-name arguments to PL/Python
+ <function>plpy.prepare()</function> to be data type aliases in
+ addition to names in <literal>pg_type</literal> (Andrew)
</para>
</listitem>
<listitem>
<para>
- Allow type-name arguments to <function>plpy.prepare()</function> to
+ Allow type-name arguments to PL/Tcl <function>spi_prepare</> to
be data type aliases in addition to names in
<literal>pg_type</literal> (Andrew)
</para>
<listitem>
<para>
- Support a true boolean type in compatible Python versions
- (Python 2.3 and later) (Marko Kreen)
+ Enable PL/PythonU to compile on Python 2.5 (Marko Kreen)
</para>
</listitem>
- </itemizedlist>
-
- </sect3>
-
- <sect3>
- <title>PL/Tcl Server-Side Language Changes</title>
- <itemizedlist>
-
<listitem>
<para>
- Allow type-name arguments to <function>spi_prepare</> to
- be data type aliases in addition to names in
- <literal>pg_type</literal> (Andrew)
+ Support a true PL/Python boolean type in compatible Python versions
+ (Python 2.3 and later) (Marko Kreen)
</para>
</listitem>
<listitem>
<para>
- Fix problems with thread-enabled <filename>libtcl</> spawning
+ Fix PL/Tcl problems with thread-enabled <filename>libtcl</> spawning
multiple threads within the backend (Steve Marshall, Paul Bayer,
Doug Knight)
</para>
<listitem>
<para>
- Show aggregate return types in <literal>\da</literal> output
- (Greg Sabino Mullane)
+ In <literal>\d</literal> patterns, always match <literal>$</literal>
+ literally (Tom)
</para>
</listitem>
<listitem>
<para>
- Add the function's volatility to the output of
- <literal>\df+</literal> (Neil)
+ Show aggregate return types in <literal>\da</literal> output
+ (Greg Sabino Mullane)
</para>
</listitem>
<listitem>
<para>
- In <literal>\d</literal> patterns, always match <literal>$</literal>
- literally (Tom)
+ Add the function's volatility to the output of
+ <literal>\df+</literal> (Neil)
</para>
</listitem>
<listitem>
<para>
- Improve performance when a database has many thousands of objects (Tom)
+ Improve performance when a database has thousands of objects (Tom)
</para>
</listitem>
<listitem>
<para>
- Enable server core dump generation in <application>pg_regress</> and
- provide an option to do so in <application>pg_ctl</>, where
- supported by the operating system
- (Andrew)
+ Enable server core dump generation in <application>pg_regress</>
+ on supported operating systems (Andrew)
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
+ Add <application>pg_ctl</> <literal> option to control generation
+ of core dumps (Andrew)
</para>
</listitem>
</para>
<para>
- If this returns true after a connection attempt fails, a client
+ If this returns true after a failed connection attempt, a client
application should prompt the user for a password. In the past
- applications have had to check for a specific error message
- string to decide whether a password is needed; that approach
- is now deprecated.
+ applications have had to check for a specific error messages to
+ decide whether a password is needed; that approach is now
+ deprecated.
</para>
</listitem>
<listitem>
<para>
- Make ecpg libraries export only intended API symbols (Michael)
+ Make ecpg libraries export only necessary API symbols (Michael)
</para>
</listitem>
<listitem>
<para>
- Add native shared memory implementation for Windows (Magnus)
+ Add native shared memory implementation (Magnus)
</para>
</listitem>
<listitem>
<para>
- Create hooks to let a loadable plugin monitor (or even replace) the
+ Create hooks to let an external plugin monitor (or even replace) the
planner and create plans for hypothetical situations (Gurjeet
Singh, Tom)
</para>
projects / postgresql / commitdiff