Document that effective cache size does not assume data remains in the

cache between queries.
15 years ago · 6c6e6f7fd3
parent e8cdc238cf
commit 6c6e6f7fd3
1 changed files with 3 additions and 1 deletions
--- a/doc/src/sgml/config.sgml
+++ b/doc/src/sgml/config.sgml
@ -2424,7 +2424,9 @@ SET ENABLE_SEQSCAN TO OFF;
        space.  This parameter has no effect on the size of shared
        memory allocated by <productname>PostgreSQL</productname>, nor
        does it reserve kernel disk cache; it is used only for estimation
-        purposes.  The default is 128 megabytes (<literal>128MB</>).
+        purposes.  The system also does not assume data remains in
+        the disk cache between queries.  The default is 128 megabytes
+        (<literal>128MB</>).
       </para>
      </listitem>
     </varlistentry>