Re: disabling foreign keys
- From: Greg Rahn <greg@xxxxxxxxxxxxxxxxxx>
- To: clay.colburn@xxxxxxxxx
- Date: Tue, 15 Feb 2011 16:20:16 -0800
If they are disabled, no, the optimizer can not use them. Other tools
may use the metadata and even if they are in a disabled state (ERD
tools etc) which may be desirable.
On Tue, Feb 15, 2011 at 3:16 PM, Clay Colburn <clay.colburn@xxxxxxxxx> wrote:
> I have a database that is a data warehouse, so we bulk load data daily and
> tune the database for heavy read operations. I noticed that all of the
> foreign keys in the database are disabled. This obviously aids in the speed
> of the loading process and the relationships can be verified during the ETL
> process.
> My question is, are there any benefits to having these disabled constraints
> laying around beyond just having a sort of meta-data description of the
> foreign key relationships? Does the optimizer use these at all?
> Thanks!
--
Regards,
Greg Rahn
http://structureddata.org
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