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Back out release changes that weren't ready for commit.
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Bruce Momjian
parent
688b3aac49
commit
29eece51a8
@ -1,4 +1,4 @@
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<!-- $PostgreSQL: pgsql/doc/src/sgml/release.sgml,v 1.516 2007/10/10 13:43:42 momjian Exp $ -->
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<!-- $PostgreSQL: pgsql/doc/src/sgml/release.sgml,v 1.517 2007/10/10 14:09:49 momjian Exp $ -->
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<!--
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Typical markup:
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@ -48,16 +48,14 @@ do it for earlier branch release files.
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<title>Overview</title>
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<para>
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This release adds major new capabilities to the
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<productname>PostgreSQL</> database system, including:
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This release adds many improvements that were requested by users,
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including:
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<itemizedlist>
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<listitem>
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<para>
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Full text search now fully integrated into the core database
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system
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Full text search is now a built-in feature
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</para>
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</listitem>
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@ -70,14 +68,13 @@ do it for earlier branch release files.
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<listitem>
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<para>
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Enumerated (enum) data types
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enum data types
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</para>
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</listitem>
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<listitem>
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<para>
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Universally Unique Identifier (UUID) data type, similar to that
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defined by RFC 4122
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UUID data type, similar to that defined by RFC 4122
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</para>
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</listitem>
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@ -89,34 +86,32 @@ do it for earlier branch release files.
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<listitem>
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<para>
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Control of whether <literal>NULL</>s sort first or last, using
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<literal>ORDER BY ... NULLS FIRST/LAST</>
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</para>
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</listitem>
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<listitem>
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<para>
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Updatable cursors using <literal>UPDATE/DELETE WHERE CURRENT OF</>
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<replaceable>cursor_name</>
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Updatable cursors
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(<literal>UPDATE/DELETE WHERE CURRENT OF</>
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<replaceable>cursor_name</>)
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</para>
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</listitem>
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<listitem>
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<para>
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Per-function server configuration parameter settings
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Per-function parameter settings
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</para>
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</listitem>
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<listitem>
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<para>
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User-defined types can now have type modifiers
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User-defined types can now have type modifiers (parameters)
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</para>
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<para>
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This allows a user type to take an optional modifier when
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being created, e.g. <type>SSNUM(7)</>. Previously only
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predefined system data types would allow this, e.g.
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<type>CHAR(4)</>.
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Declarations such as <type>varchar(42)</type> are no longer
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restricted to use by built-in data types.
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</para>
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</listitem>
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@ -133,10 +128,10 @@ do it for earlier branch release files.
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<listitem>
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<para>
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Numerous improvements in logging and statistics collection,
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including the ability to emit postmaster log messages in
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<acronym>CSV</> format, which can be loaded into a database
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table for analysis
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Numerous improvements in logging and statistics collection
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capabilities, including the ability to emit postmaster log messages
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in CSV format that can be directly loaded into a database table
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for analysis
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</para>
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</listitem>
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@ -152,24 +147,21 @@ do it for earlier branch release files.
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</para>
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<para>
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This allows multiple vacuums to run concurrently, meaning
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vacuuming of a large table will not prevent smaller tables from
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being vacuumed at the same time. Autovacuum is now considered
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mature and therefore is enabled by default.
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Autovacuum is now considered mature enough to be enabled by default.
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</para>
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</listitem>
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<listitem>
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<para>
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The backend database server can now be compiled with
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<productname>Microsoft Visual C++</>
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The entire <productname>PostgreSQL</productname> system can
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now be compiled with Microsoft Visual C++
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</para>
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<para>
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Windows executables made with Visual C++ might have better
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stability and performance than those made with other tool sets.
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Development and debugging tools familiar to Windows developers
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will also work.
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This will improve the ability of Windows-based developers to
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contribute to the project. Windows executables made with Visual C++
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may also have better stability and performance than those made with
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other tool sets.
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</para>
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</listitem>
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@ -181,41 +173,32 @@ do it for earlier branch release files.
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<listitem>
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<para>
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Asynchronous commit option allows transactions to be committed
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but on-disk change to be delayed
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Asynchronous commit option to allow transactions to be reported
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committed before they have actually been flushed to disk
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</para>
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<para>
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This feature dramatically increases performance for data
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modification queries. The disadvantage is that because on-disk
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changes are delayed, if the operating system crashes before data
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is written to the disk, committed data will be lost. This is
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only useful for applications that can accept some data loss.
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Unlike <varname>fsync</varname>, asynchronous commit does not
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risk database corruption; the worst case is that after an
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operating system crash, the last few reportedly-committed
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transactions will be missing.
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This would not, of course, be acceptable if the client takes some
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critical external action on the assumption that the transaction
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will be remembered; but for certain applications, it is an acceptable
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risk for some or all transactions to use this mode. Unlike existing
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options such as <varname>fsync</varname>, asynchronous commit does
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not risk database corruption; the worst case is that after a crash,
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the last few reportedly-committed transactions will not have
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taken effect.
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</para>
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</listitem>
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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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<quote>Distributed</> checkpoints to spread out the I/O load of a
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checkpoint
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</para>
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</listitem>
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<listitem>
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<para>
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Heap-Only Tuples (<acronym>HOT</>) reduce overhead of updates
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</para>
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<para>
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To allow high concurrency <productname>PostgreSQL</> retains old
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versions of updated rows. Previously only <command>VACUUM</>
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could reuse space taken by dead rows. With <acronym>HOT</> dead
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row space can be reused at the time of <command>UPDATE</> or
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<command>INSERT</>. This allows for more consistent performance.
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Heap-Only Tuples (HOT) to reduce overhead of updates
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</para>
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</listitem>
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@ -224,21 +207,12 @@ do it for earlier branch release files.
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Just-in-time background writer strategy to improve disk write
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efficiency
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</para>
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<para>
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This basically makes the background writer self-tuning.
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</para>
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</listitem>
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<listitem>
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<para>
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Reduction of both per-field and per-row storage requirements
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</para>
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<para>
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For example, two <type>CHAR(1)</type> fields now take 4 bytes
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instead of 16.
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Reduction of on-disk data size through reducing both per-tuple
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and per-field overheads
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</para>
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</listitem>
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