9.0 release notes updates.

Josh Berkus

diff --git a/doc/src/sgml/release-9.0.sgml b/doc/src/sgml/release-9.0.sgml
index 3f3c966894581f187012c2601f1579b56413499e..d48ca01e8bbf9e1503ec45726267d1dce3fead21 100644 (file)
--- a/doc/src/sgml/release-9.0.sgml
+++ b/doc/src/sgml/release-9.0.sgml
@@ -1,4 +1,4 @@
-
+
 
  
   Release 9.0
@@ -108,7 +108,7 @@
       Add support for compiling on 
       linkend="install-win32-full">64-bit
       Windows and running in 64-bit
-      mode
+      mode.
      
     
 
@@ -133,13 +133,17 @@
   CURRENT AS OF 2010-06-03
 
   
-   A dump/restore using pg_dump is
-   required for those wishing to migrate data from any previous
+   A dump/restore using pg_dump
+   or use of pg_upgrade is required 
+   for those wishing to migrate data from any previous
    release.
   
 
   
-   Observe the following incompatibilities:
+   Version 9.0 contains a number of changes which selectively break backwards compatibility
+   in order to support new features and code quality improvements.  Particularly, users
+   who make extensive use of PL/pgSQL and/or PITR and Warm Standby should test their
+   solutions for breakage.  Observe the following incompatibilities:
   
 
   
@@ -488,6 +492,12 @@
        linkend="guc-geqo-seed">geqo_seed to randomize
        the starting value of the random plan generator.
       
+
+      
+       This gives GEQO query response times and resource usage
+       repeatability and predictability.
+      
+
      
 
      
@@ -623,6 +633,11 @@
        name, which is displayed in
        pg_stat_activity (Dave Page)
       
+
+      
+        This allows DBAs to characterize database traffic 
+        and troubleshoot problems by source application.
+      
      
 
      
@@ -688,7 +703,11 @@
        in the new pg_db_role_setting system table. A new
        psql \drds command shows these settings.
        Backwards-compatible system views do not show this information.
+       The primary use of this feature is setting schema 
+       search_path.
       
+
+
      
 
      
@@ -722,6 +741,12 @@
        Log changed parameter values when postgresql.conf is
        reloaded (Peter Eisentraut)
       
+
+      
+       This lets DBAs and security staff to audit when database settings
+       were changed.
+      
+
      
 
      
@@ -794,6 +819,12 @@
       (Boszormenyi Zoltan)
      
 
+     
+      For drivers which support this feature, this saves an entire 
+      round-trip to the client, allowing result counts and pagination
+      to be calculated without a second COUNT query.
+     
+
      
       psql does not display these counts.
      
@@ -909,7 +940,7 @@
       
        Such operations either complete fully or are rolled back, so
        WAL archiving can be skipped, unless running in continuous
-       archiving mode.
+       archiving mode.  This reduces I/O overhead and improves performance.
       
      
 
@@ -1274,6 +1305,13 @@
       PQescapeByteaConn() now uses the hex format
       for PostgreSQL 9.0 servers.
      
+
+     
+      The new hex format will be directly compatible with more applications
+      which use binary data, allowing them to store and retrieve
+      it without conversion.
+     
+
     
 
     
@@ -1417,7 +1455,8 @@
       
        For example, this is now supported, array_agg(a ORDER BY
        b). This is useful for aggregates where the order of values is
-       significant.
+       significant, and eliminates the need to have a subquery for
+       the ordering.