Re: Rules slower than Dynamic SQL ?

[Decibel! <decibel@xxxxxxxxxxx>]

On Nov 26, 2007, at 6:09 PM, Simon Riggs wrote:
> On Mon, 2007-11-26 at 16:01 -0800, Alex Vinogradovs wrote:
> > I've got a data warehouse with pretty high rate of insert into
> > partitioned tables. What I've noticed, is that rule-based  
> > partitioning
> > seems to be somewhat slower than insertions made directly into
> > partitions through execution of dynamic SQL.
> >
> > Is it really true ?
>
> Depends how complex your rules are, but I think yes is the short  
> answer.

My understanding is that each rule has to re-evaluate the query  
that's being run. That's going to add some overhead to a simple  
INSERT INTO table VALUES ... but if you think that's bad, try it with  
an expensive INSERT INTO table SELECT statement!
--
Decibel!, aka Jim C. Nasby, Database Architect  decibel@xxxxxxxxxxx
Give your computer some brain candy! www.distributed.net Team #1828

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