Add documentation stating how to determine if FSM settings are too low

--- look at a database-wide VACUUM VERBOSE.

diff --git a/doc/src/sgml/runtime.sgml b/doc/src/sgml/runtime.sgml
index 72bc1ff17e3e38181acb27dac517c8e7309bee92..cb527bedbc1cfe4bb599955124c2ab4df1c47e29 100644 (file)
--- a/doc/src/sgml/runtime.sgml
+++ b/doc/src/sgml/runtime.sgml
@@ -1,5 +1,5 @@
 
 
 
@@ -1151,6 +1151,10 @@ SET ENABLE_SEQSCAN TO OFF;
         be tracked in the shared free-space map.  Six bytes of shared memory
         are consumed for each page slot.  This setting must be more than
         16 * max_fsm_relations.  The default is 20000.
+        The last few lines of a database-wide VACUUM VERBOSE 
+        can help in determining if the the default setting is suitable.  
+        A NOTICE message is also printed during such an operation
+        if the current setting is too low.
         This option can only be set at server start.
        
       
@@ -1167,6 +1171,10 @@ SET ENABLE_SEQSCAN TO OFF;
         free space will be tracked in the shared free-space map.  Roughly
         fifty bytes of shared memory are consumed for each slot.
         The default is 1000.
+        The last few lines of a database-wide VACUUM VERBOSE
+        can help in determining if the the default setting is suitable.  
+        A NOTICE message is also printed during such an operation
+        if the current setting is too low.
         This option can only be set at server start.