Re: constraint with reference to the same table

Victor,

I see.
Good point.

Thank you kindly.
Regards
Rudi.


Victor Yegorov wrote:

>* Rudi Starcevic <rudi@oasis.net.au> [15.05.2003 02:59]:
>  
>
>>Hi,
>>
>>Can I confirm what this means then ..
>>
>>For large table's each column with ref. inegritry I should create an 
>>index on those columns ?
>>    
>>
>
>I think, that indicies are needed only at delete stage to decrease search
>time of possible referencing rows.
>Not only, of course, but when we speak about
>INSERT/UPDATE/DELETE data it is so.
>
>On the other side, indicies increases total query runtime, because for
>each row deleted/updated/inserted it'll be necessary to update each index.
>
>In my case, I at first drop "cyclic" constraints, do the job and then
>restore them.
>
>
>  
>