Update FAQ.

diff --git a/doc/FAQ b/doc/FAQ
index f59d74ff9a311274fb7d8b930f8d43073115d720..7224c15f7752590b792ffcf01abddc889c9ace14 100644 (file)
--- a/doc/FAQ
+++ b/doc/FAQ
@@ -1,7 +1,7 @@
 
                 Frequently Asked Questions (FAQ) for PostgreSQL
                                        
-   Last updated: Wed May 30 18:57:52 EDT 2001
+   Last updated: Wed May 30 19:00:33 EDT 2001
    
    Current maintainer: Bruce Momjian ([email protected])
    
@@ -709,9 +709,9 @@ Maximum number of indexes on a table?    unlimited
    column statistics on its own, so VACUUM ANALYZE must be run to collect
    them periodically.
    
-   Indexes are usually not used for ORDER BY or joins: a sequential scan
+   Indexes are usually not used for ORDER BY or joins. A sequential scan
    followed by an explicit sort is faster than an indexscan of all tuples
-   of a large table, because it takes fewer disk accesses.
+   of a large table. This is because random disk access is very slow.
    
    When using wild-card operators such as LIKE or ~, indices can only be
    used if the beginning of the search is anchored to the start of the

diff --git a/doc/src/FAQ/FAQ.html b/doc/src/FAQ/FAQ.html
index 932b2b7856db3d4fa266bc214a043110ef56a79f..aba74b0e93ab1ff0754cc4067a197ee928fd7fdf 100644 (file)
--- a/doc/src/FAQ/FAQ.html
+++ b/doc/src/FAQ/FAQ.html
@@ -12,7 +12,7 @@
   alink="#0000FF">
     Frequently Asked Questions (FAQ) for PostgreSQL
 
-    Last updated: Wed May 30 18:57:52 EDT 2001
+    Last updated: Wed May 30 19:00:33 EDT 2001
 
     Current maintainer: Bruce Momjian (
     "mailto:[email protected]">[email protected])
@@ -908,9 +908,9 @@ Maximum number of indexes on a table?    unlimited
     periodically.
 
     Indexes are usually not used for ORDER BY
-    or joins: a sequential scan followed by an explicit sort is
-    faster than an indexscan of all tuples of a large table, because it
-    takes fewer disk accesses.
+    or joins.  A sequential scan followed by an explicit sort is
+    faster than an indexscan of all tuples of a large table.  This
+    is because random disk access is very slow.
 
     When using wild-card operators such as LIKE or
     ~, indices can only be used if the beginning of the search