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

..

bench

Make sure -L and -I's for our source tree are always before system include

2001-02-20 19:20:30 +00:00

examples

Use PQfreemem() consistently, and document its use for Notify.

2003-03-25 02:44:36 +00:00

locale

Remove all traces of multibyte and locale options. Clean up comments

2002-09-03 21:45:44 +00:00

mb

Remove all traces of multibyte and locale options. Clean up comments

2002-09-03 21:45:44 +00:00

performance

/usr/local/bin/perl => /usr/bin/perl

2001-09-04 11:41:04 +00:00

regress

Avoid primary key lookup (and lock) if foreign key does not change

2003-04-07 20:30:38 +00:00

Makefile

New unified regression test driver, test/regress makefile cleanup,

2000-09-29 17:17:41 +00:00