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cd203f3395
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Jan Wieck cd203f3395 Avoid primary key lookup (and lock) if foreign key does not change 
on UPDATE.

This get's rid of the long standing annoyance that updating a row
that has foreign keys locks all the referenced rows even if the
foreign key values do not change.

The trick is to actually do a check identical to NO ACTION after an
eventually done UPDATE in the SET DEFAULT case. Since a SET DEFAULT
operation should have moved referencing rows to a new "home", a following
NO ACTION check can only fail if the column defaults of the referencing
table resulted in the key we actually deleted. Thanks to Stephan.

Jan
2003-04-07 20:30:38 +00:00
config Generate pg_config.h.in by autoheader. Separate out manually editable 2003-04-06 22:45:23 +00:00
contrib Please, apply patch for contrib/ltree to current CVS and 7.3.2 2003-03-31 20:53:45 +00:00
doc General editing 2003-04-07 01:29:26 +00:00
src Avoid primary key lookup (and lock) if foreign key does not change 2003-04-07 20:30:38 +00:00
aclocal.m4 Remove leftovers from subproject removals. Fixes for Python and Kerberos 2002-09-04 22:54:18 +00:00
configure Generate pg_config.h.in by autoheader. Separate out manually editable 2003-04-06 22:45:23 +00:00
configure.in Generate pg_config.h.in by autoheader. Separate out manually editable 2003-04-06 22:45:23 +00:00
COPYRIGHT
GNUmakefile.in First step to removing /contrib/retep, with Peter Mount's approval. 2002-10-21 00:12:46 +00:00
HISTORY Allow PAM to work on MAC OS X, report from Aaron Hillegass. 2003-02-14 14:13:56 +00:00
INSTALL Regenerate 2002-11-21 23:33:22 +00:00
Makefile
README Improve wording. 2002-11-11 20:03:40 +00:00
register.txt Stamp for 7.3 beta3. 2002-10-24 03:03:37 +00:00

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 several language
bindings, including C, Perl, Python, and Tcl, as well as a JDBC
driver.

The ODBC and C++ interfaces have been moved to the PostgreSQL Projects
Web Site at http://gborg.postgresql.org for separate maintenance.

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.  Changes between all PostgreSQL releases are recorded in the
file HISTORY.  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
ftp://ftp.postgresql.org/pub/.  For more information look at our web
site located at http://www.postgresql.org/.