Re: EO inheritance + Oracle
Re: EO inheritance + Oracle
- Subject: Re: EO inheritance + Oracle
- From: Chuck Hill <email@hidden>
- Date: Tue, 22 Mar 2011 16:47:59 -0700
Are you using Wonder? I thought that Wonder would collapse these into an IN. Oracle might be more inclined to optimize that. It might be that the Wonder qualifier support is not used for inheritance. You might try running the SQL for that and see if the Oracle optimizer will play nice.
You could try an ERXInQualifier, but I think that EOF is still going to want the restricting qualifiers.
Chuck
On Mar 22, 2011, at 4:31 PM, Jon Nolan wrote:
> I have a fairly involved EO inheritance tree that works beautifully in every way but one. Here's a quick example illustrating the structure I'm using:
>
> Human
> North American
> American
> Canadian
> Mexican
> European
> German
> Italian
> Spaniard
> Asian
> Korean
> Laotian
>
> etc. You get the idea.
>
> So if I utilize European.fetchEuropeans(...) a qualifier is generated along the lines of HUMAN_TYPE = German or HUMAN_TYPE = Italian or HUMAN_TYPE = Spaniard. This would be fine except for the Oracle optimizer deciding not to use the HUMAN_TYPE_IDX index. I've tried using hints but (a) it's difficult to get right for a query generated by a ERXBatchingDisplayGroup and (b) the JDBC adaptor disconnects me when I try.
>
> There is another qualifier clause which happens to make it so that, in the European example, all the returned humans will indeed be German, Italian or Spaniard. Is there any way to simply discard the OR'd HUMAN_TYPE qualifier? Any other suggestions? Do I have something wrong in my model in the first place?
>
> Thanks,
> Jon
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--
Chuck Hill Senior Consultant / VP Development
Practical WebObjects - for developers who want to increase their overall knowledge of WebObjects or who are trying to solve specific problems.
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