[EMAIL PROTECTED] (Markus Wanner) writes: > as you might know, Postgres-R relies on primary keys to address tuples > of a table. It cannot replicate tables without a primary key.
Slony-I does the same, with the "variation" that it permits the option of using a "candidate primary key," namely an index that is unique+NOT NULL. If it is possible to support that broader notion, that might make addition of these sorts of logic more widely useful. > Primary keys currently aren't really used within the executor, so I > had to extended and modify Postgres here and there, to get the > required information. To ease reviewing I have split out these > modifications and present them here as two separate little patches. I know Jan Wieck has in mind the idea of adding an interface to enable doing highly efficient IUD (Insert/Update/Delete) via generating a way to do direct heap updates, which would be *enormously* more efficient than the present need (in Slony-I, for instance) to parse, plan and execute thousands of IUD statements. For UPDATE/DELETE to work requires utilizing (candidate) primary keys, so there is some seemingly relevant similarity there. -- select 'cbbrowne' || '@' || 'linuxfinances.info'; http://cbbrowne.com/info/lsf.html Rules of the Evil Overlord #145. "My dungeon cell decor will not feature exposed pipes. While they add to the gloomy atmosphere, they are good conductors of vibrations and a lot of prisoners know Morse code." <http://www.eviloverlord.com/> -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
