Exclude pg_internal.init from BASE_BACKUP

Add docs to explain this for other backup mechanisms

Author: David Steele <david@pgmasters.net>
Reviewed-by: Petr Jelinek <petr.jelinek@2ndQuadrant.com> et al

2 files changed, 11 insertions, 0 deletions

diff --git a/doc/src/sgml/backup.sgml b/doc/src/sgml/backup.sgml
index dd9c1bff5b3..fa3a7016312 100644
--- a/doc/src/sgml/backup.sgml
+++ b/doc/src/sgml/backup.sgml
@@ -1130,6 +1130,12 @@ SELECT pg_stop_backup();
    </para>
 
    <para>
+    <filename>pg_internal.init</filename> files can be omitted from the
+    backup whenever a file of that name is found.  These files contain
+    relation cache data that is always rebuilt when recovering.
+   </para>
+
+   <para>
     The backup label
     file includes the label string you gave to <function>pg_start_backup</function>,
     as well as the time at which <function>pg_start_backup</function> was run, and
diff --git a/doc/src/sgml/protocol.sgml b/doc/src/sgml/protocol.sgml
index 15108baf714..f82affd0c58 100644
--- a/doc/src/sgml/protocol.sgml
+++ b/doc/src/sgml/protocol.sgml
@@ -2501,6 +2501,11 @@ The commands accepted in walsender mode are:
        </listitem>
        <listitem>
         <para>
+         <filename>pg_internal.init (found in multiple directories)</>
+        </para>
+       </listitem>
+       <listitem>
+        <para>
          Various temporary files and directories created during the operation
          of the PostgreSQL server, such as any file or directory beginning
          with <filename>pgsql_tmp</filename>.