pg_buffercache: document column meanings

Improve documentation for usagecount and relforknumber.
Backpatch to 9.3.
Suggestion from Satoshi Nagayasu

diff --git a/doc/src/sgml/pgbuffercache.sgml b/doc/src/sgml/pgbuffercache.sgml
index 1d7d95f9d7de3d972374d05a96308971f5cf961e..685351f11eb52b2942f41b6ec59b2a950c0d1328 100644 (file)
--- a/doc/src/sgml/pgbuffercache.sgml
+++ b/doc/src/sgml/pgbuffercache.sgml
@@ -84,7 +84,8 @@
       <entry><structfield>relforknumber</structfield></entry>
       <entry><type>smallint</type></entry>
       <entry></entry>
-      <entry>Fork number within the relation</entry>
+      <entry>Fork number within the relation;  see
+      <filename>include/storage/relfilenode.h</></entry>
      </row>
 
      <row>
@@ -98,7 +99,7 @@
       <entry><structfield>usagecount</structfield></entry>
       <entry><type>smallint</type></entry>
       <entry></entry>
-      <entry>Page LRU count</entry>
+      <entry>Clock-sweep access count</entry>
      </row>
 
     </tbody>