Patch to mention cost-based delay in vacuum reference

Alvaro Herrera

diff --git a/doc/src/sgml/ref/vacuum.sgml b/doc/src/sgml/ref/vacuum.sgml
index e020c9a9acdb85316044c351a02524e3c89caa0d..1c90fe4ef1bc51d94c727d5b838bcd15216602e8 100644 (file)
--- a/doc/src/sgml/ref/vacuum.sgml
+++ b/doc/src/sgml/ref/vacuum.sgml
@@ -1,5 +1,5 @@
 
 
@@ -174,6 +174,15 @@ VACUUM [ FULL | FREEZE ] [ VERBOSE ] ANALYZE [ ta
     to occupy less disk space.  VACUUM FULL will usually
     shrink the table more than a plain VACUUM would.
    
+
+   
+    During VACUUM execution, there can be a substantial
+    increase in I/O traffic, which cause poor performance for other active
+    sessions.  Therefore, it is sometimes advisable to use
+    the cost-based vacuum delay feature.  See 
+    linkend="runtime" endterm="runtime-config-resource-vacuum-cost"> for more
+    details.
+   
  
 
  
@@ -229,6 +238,7 @@ VACUUM
 
   
    
+