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Although initdb has long discouraged use of a filesystem mount-point directory as a PG data directory, this point was covered nowhere in the user-facing documentation. Also, with the popularity of pg_upgrade, we really need to recommend that the PG user own not only the data directory but its parent directory too. (Without a writable parent directory, operations such as "mv data data.old" fail immediately. pg_upgrade itself doesn't do that, but wrapper scripts for it often do.) Hence, adjust the "Creating a Database Cluster" section to address these points. I also took the liberty of wordsmithing the discussion of NFS a bit. These considerations aren't by any means new, so back-patch to all supported branches.
PostgreSQL Database Management System ===================================== This directory contains the source code distribution of the PostgreSQL database management system. PostgreSQL is an advanced object-relational database management system that supports an extended subset of the SQL standard, including transactions, foreign keys, subqueries, triggers, user-defined types and functions. This distribution also contains C language bindings. PostgreSQL has many language interfaces, many of which are listed here: http://www.postgresql.org/download See the file INSTALL for instructions on how to build and install PostgreSQL. That file also lists supported operating systems and hardware platforms and contains information regarding any other software packages that are required to build or run the PostgreSQL system. Copyright and license information can be found in the file COPYRIGHT. A comprehensive documentation set is included in this distribution; it can be read as described in the installation instructions. The latest version of this software may be obtained at http://www.postgresql.org/download/. For more information look at our web site located at http://www.postgresql.org/.