Re: Inheritance...
Re: Inheritance...
- Subject: Re: Inheritance...
- From: Guido Neitzer <email@hidden>
- Date: Wed, 7 May 2008 14:37:55 -0600
On 07.05.2008, at 14:08, Mike Schrag wrote:
I would recommend AGAINST horizontal here -- You have 10 entities in
your hierarchy, which means 10 fetches every time you need to fault
an object of the root entity. I second Chuck on using single
table. Yes, your database is uglier, and you lose some of the
benefits of database not-null constraints, but this is really more
of an issue if other apps are using your database. For us, it's
almost never the case .. our WO apps get exclusive access to the dbs
generally, so as Chuck as said, the database is an implementation
detail. I let EOF worry about the fact that it has a lot of columns.
Same here. I do only single table inheritance (for performance
reasons) and it always "just worked". Some of the apps had fairly
decent complexity and traffic.
I played around with the other inheritance styles but I always had to
worry about performance because buying decent hardware wasn't that
easy ... ;-)
And I normally don't have to worry about other technologies accessing
my databases.
cug
--
http://www.event-s.net
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