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<appendix id="release">
<listitem><para>Fix SSL to handle errors cleanly (Nathan Mueller)
<footnote>
<para>
- In prior releases,
+ In prior releases, certain rare SSL API error reports were not
+ handled correctly. This release fixes those problems.
+ gracefully.
+ </para>
+ </footnote>
+ </para></listitem>
+<listitem><para>SSL protocol security and performance improvements (Sean Chittenden)
+ <footnote>
+ <para>
+ SSL key renegotiation was happening too frequently, causing poor SSL
+ performance. Also, initial key handling was improved.
+ </para>
+ </footnote>
+ </para></listitem>
+<listitem><para>Print lock information when a deadlock is detected (Tom)
+ <footnote>
+ <para>
+ This allows easier debugging of deadlock situations.
+ </para>
+ </footnote>
+ </para></listitem>
+<listitem><para>Update <filename>/tmp</filename> socket mod. times regularly to avoid their removal (Tom)
+ <footnote>
+ <para>
+ This should help prevent <filename>/tmp</filename> directory cleaner
+ administration scripts from removing server socket files.
</para>
</footnote>
</para></listitem>
-<listitem><para>SSL protocol security and performance improvements (Sean Chittenden)</para></listitem>
-<listitem><para>Print lock information when a deadlock is detected (Tom)</para></listitem>
-<listitem><para>Update <filename>/tmp</filename> socket mod. times regularly to avoid their removal (Tom)</para></listitem>
<listitem><para>Enable PAM for MAC OS X (Aaron Hillegass)</para></listitem>
-<listitem><para>Make btree indexes fully WAL-safe (Tom)</para></listitem>
+<listitem><para>Make btree indexes fully WAL-safe (Tom)
+ <footnote>
+ <para>
+ In prior releases, under certain rare cases, a server crash could
+ cause btree indexes to become corrupt. This release removes those
+ last few rare cases.
+ </para>
+ </footnote>
+ </para></listitem>
<listitem><para>Allow btree index compaction and empty page reuse (Tom)</para></listitem>
-<listitem><para>Fix inconsistent index lookups during split of first root page (Tom)</para></listitem>
+<listitem><para>Fix inconsistent index lookups during split of first root page (Tom)
+ <footnote>
+ <para>
+ In prior releases, when a single-page index split into two page,
+ there was a brief period when another database session would miss
+ seeing an index entry. This failure was possible primarly on
+ multi-cpu machines. This release fixes that rare failure case.
+ </para>
+ </footnote>
+ </para></listitem>
<listitem><para>Improve free space map allocation logic (Tom)</para></listitem>
-<listitem><para>Preserve free space information between postmaster restarts (Tom)</para></listitem>
+<listitem><para>Preserve free space information between postmaster restarts (Tom)
+ <footnote>
+ <para>
+ In prior releases, the free space map was not saved when the
+ postmaster was stopped, so newly started servers has no free space
+ information. This release saves the free space map, which is loaded
+ when the server is restarted.
+ </para>
+ </footnote>
+ </para></listitem>
<listitem><para>Set proper schema permissions in initdb (Peter)</para></listitem>
<listitem><para>Add start time to pg_stat_activity (Neil)</para></listitem>
<listitem><para>New code to detect corrupt disk pages; erase with zero_damaged_pages (Tom)</para></listitem>
<listitem><para>Allow multi-key hash joins (Tom)</para></listitem>
<listitem><para>Improve constant folding (Tom)</para></listitem>
<listitem><para>Add ability to inline simple SQL functions (Tom)</para></listitem>
-<listitem><para>Reduce memory usage for queries using complex functions (Tom)</para></listitem>
-<listitem><para>Improve GEQO optimizer performance (Tom)</para></listitem>
+<listitem><para>Reduce memory usage for queries using complex functions (Tom)
+ <footnote>
+ <para>
+ In prior releases, functions returning allocated memory would
+ not free it until the query completed. This release allows the
+ freeing of function-allocated memory when the function call
+ completes, reducing the total memory used by functions.
+ </para>
+ </footnote>
+ </para></listitem>
+<listitem><para>Improve GEQO optimizer performance (Tom)
+ <footnote>
+ <para>
+ There were several inefficiencies in the way the GEQO optimizer
+ managed potential query paths. This release fixes this.
+ </para>
+ </footnote>
+ </para></listitem>
<listitem><para>Allow IN/NOT IN to be handled via hash tables (Tom)</para></listitem>
<listitem><para>Improve NOT IN (subquery) performance (Tom)</para></listitem>
<listitem><para>Allow most IN subqueries to be processed as joins (Tom)</para></listitem>
-<listitem><para>Allow the postmaster to preload libraries using preload_libraries (Joe)</para></listitem>
+<listitem><para>Allow the postmaster to preload libraries using preload_libraries (Joe)
+ <footnote>
+ <para>
+ For shared libraries that require a long time to load, this option
+ is available so the library can be pre-loaded in the postmaster and
+ inherited by all database sessions.
+ </para>
+ </footnote>
+ </para></listitem>
<listitem><para>Improve optimizer cost computations, particularly for subqueries (Tom)</para></listitem>
<listitem><para>Avoid sort when subquery ORDER BY matches upper query (Tom)</para></listitem>
<listitem><para>Assume WHERE a.x = b.y and b.y = 42 also means a.x = 42 (Tom)</para></listitem>
<listitem><para>Improve trigger/constraint performance (Stephan)</para></listitem>
<listitem><para>Improve speed of col IN (const, const, const, ...) (Tom)</para></listitem>
<listitem><para>Fix hash indexes which were broken in rare cases (Tom)</para></listitem>
-<listitem><para>Improve hash index concurrency and speed (Tom)</para></listitem>
-<listitem><para>Align shared buffers on 32-byte boundary for copy speed improvement (Manfred Spraul)</para></listitem>
-<listitem><para>The NUMERIC datatype has been reimplemented for better performance (Tom)</para></listitem>
+<listitem><para>Improve hash index concurrency and speed (Tom)
+ <footnote>
+ <para>
+ Prior releases suffered from poor hash index performance,
+ particularly for high concurrency situations. This release fixes
+ that, and the development group is interested in reports comparing
+ btree and hash index performance.
+ </para>
+ </footnote>
+ </para></listitem>
+<listitem><para>Align shared buffers on 32-byte boundary for copy speed improvement (Manfred Spraul)
+ <footnote>
+ <para>
+ Certain CPU's perform faster data copies when addresses are 32-bit
+ aligned.
+ </para>
+ </footnote>
+ </para></listitem>
+<listitem><para>The NUMERIC datatype has been reimplemented for better performance (Tom)
+ <footnote>
+ <para>
+ NUMERIC used to be stored in base-100. The new code uses base-10000,
+ for significantly better performance.
+ </para>
+ </footnote>
+ </para></listitem>
</itemizedlist></sect3>
<sect3><title>Server Configuration</title>
<itemizedlist>
<listitem><para>Rename server parameter server_min_messages to log_min_messages (Bruce)</para></listitem>
+ <footnote>
+ <para>
+ This was done so most parameters that control the server logs being
+ with <literal>log_>/>.
+ </para>
+ </footnote>
<listitem><para>Rename show_*_stats to log_*_stats (Bruce)</para></listitem>
<listitem><para>Rename show_source_port to log_source_port (Bruce)</para></listitem>
<listitem><para>Rename hostname_lookup to log_hostname (Bruce)</para></listitem>
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