RANDOM_PAGE_COST clarification of docs.

Joseph Shraibman

diff --git a/doc/src/sgml/runtime.sgml b/doc/src/sgml/runtime.sgml
index b1c96d9824c54e916a46394d29b692bd23929aea..8821835b1b535d3446d06b20f7fd1ed3f0e531d2 100644 (file)
--- a/doc/src/sgml/runtime.sgml
+++ b/doc/src/sgml/runtime.sgml
@@ -1,5 +1,5 @@
 
 
 
@@ -841,7 +841,9 @@ env PGOPTIONS='-c geqo=off' psql
        
         Sets the query optimizer's estimate of the cost of a
         nonsequentially fetched disk page. This is measured as a
-        multiple of the cost of a sequential page fetch.
+        multiple of the cost of a sequential page fetch. A higher
+        value makes it more likely a sequential scan will be used,
+        a lower value makes it more likely an index scan will be used.