Clarify statements about tar archive format.

diff --git a/doc/src/sgml/ref/pg_dump.sgml b/doc/src/sgml/ref/pg_dump.sgml
index 3286c9575a853f2c364a83f8c6af9d7c3dad0a01..0f254d45ad73aa70266b2d441d7d68d0d49d14f6 100644 (file)
--- a/doc/src/sgml/ref/pg_dump.sgml
+++ b/doc/src/sgml/ref/pg_dump.sgml
@@ -1,5 +1,5 @@
 
 
@@ -77,8 +77,8 @@ PostgreSQL documentation
    the custom format (-Fc). It allows
    for selection and reordering of all archived items, and is compressed
    by default. The tar format
-   (-Ft) is not compressed and it is not possible to
-   reorder data when loading, but it is otherwise quite flexible;
+   (-Ft) is not compressed and has restrictions on
+   reordering data when loading, but it is otherwise quite flexible;
    moreover, it can be manipulated with standard Unix tools such as
    tar.
   
@@ -224,10 +224,11 @@ PostgreSQL documentation
          custom
          
           
-           Output a custom archive suitable for input into
-           pg_restore. This is the most flexible
-           format in that it allows reordering of loading data as well
-           as object definitions. This format is also compressed by default.
+           Output a custom-format archive suitable for input into
+           pg_restore.
+           This is the most flexible output format in that it allows manual
+           selection and reordering of archived items during restore.
+           This format is also compressed by default.
           
          
         
@@ -237,11 +238,14 @@ PostgreSQL documentation
          tar
          
           
-           Output a tar archive suitable for input into
-           pg_restore. Using this archive format
-           allows reordering and/or exclusion of database objects
-           at the time the database is restored. It is also possible to limit
-           which data is reloaded at restore time.
+           Output a tar-format archive suitable for input
+           into pg_restore.
+           This output format allows manual selection and reordering of
+           archived items during restore, but there is a restriction: the
+           relative order of table data items cannot be changed during
+           restore.  Also, tar format does not support
+           compression and has a limit of 8 GB on the size of individual
+           tables.