Add mention of index on foreign key for frequently updated primary key

tables.

diff --git a/doc/src/sgml/ref/create_table.sgml b/doc/src/sgml/ref/create_table.sgml
index ec264dbb118cf350ae71239e318829aaa7e66d80..87ebda032efaaee0d694226280e378be5e04aa2d 100644 (file)
--- a/doc/src/sgml/ref/create_table.sgml
+++ b/doc/src/sgml/ref/create_table.sgml
@@ -1,5 +1,5 @@
 
 
@@ -437,6 +437,13 @@ and table_constraint is:
        
       
      
+     
+      If primary key column is updated frequently, it may be wise to
+      add an index to the REFERENCES column so that
+      NO ACTION and CASCADE
+      actions associated with the REFERENCES
+      column can be more efficiently performed.
+     
 
     
    
@@ -472,6 +479,8 @@ and table_constraint is:
     
    
   
+
+