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Robert Haas fd31cd2651 Don't vacuum all-frozen pages. Commit `a892234f83` gave us enough infrastructure to avoid vacuuming pages where every tuple on the page is already frozen. So, replace the notion of a scan_all or whole-table vacuum with the less onerous notion of an "aggressive" vacuum, which will pages that are all-visible, but still skip those that are all-frozen. This should greatly reduce the cost of anti-wraparound vacuuming on large clusters where the majority of data is never touched between one cycle and the next, because we'll no longer have to read all of those pages only to find out that we don't need to do anything with them. Patch by me, reviewed by Masahiko Sawada.		2016-03-10 16:14:42 -05:00
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contrib	Refactor pull_var_clause's API to make it less tedious to extend.	2016-03-10 15:53:07 -05:00
doc	Don't vacuum all-frozen pages.	2016-03-10 16:14:42 -05:00
src	Don't vacuum all-frozen pages.	2016-03-10 16:14:42 -05:00
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configure	Add support for systemd service notifications	2016-02-02 21:04:29 -05:00
configure.in	Add support for systemd service notifications	2016-02-02 21:04:29 -05:00
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README

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/.