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Home -> Community -> Mailing Lists -> Oracle-L -> RE: WHERE 1 = 1 (any info on this)
=)
Agreed but they're altering a custom Oracle Applications view. They want to change as little as possible but they need to understand why the author of the view (who's now long gone) coded it in this way so that they know which pitfall they're trying to avoid.
I think we may end up with a rewritten view anyway in the long run.
cheers,
Mike
-----Original Message-----
Sent: 21 October 2003 12:05
To: Multiple recipients of list ORACLE-L
Quoting Pete Sharman's signature from my memory: Controlling developers is harder then herding cats. Tell your developers that there exists a thing called "CBO" which has something called "hints" that can alleviate the need for such ridiculous WHERE clauses.
On 2003.10.21 07:44, "Hately, Mike (LogicaCMG)" wrote:
> Morning folks,
>
> the developers here are looking at a view with a where clause which
> specifies :
>
> WHERE 1=1 AND
> ............... AND
> ............... etc.
>
> I'd seen this used before as a way of tweaking the RBO into certain
> behaviours but it was years ago and my recollection is very hazy.
> The only explanation I've found so far is :
>
> "the 1=1 is in there to avoid doing repetitive index scans for single
> rowids, when the app "knows" the result set is going to be manipulated
> rowid's for a large subset of the table. I would guess your DUAL/CBO
example
> had some similar effect."
>
> Is anyone familiar enough with this tweak to explain it ?
>
> Cheers,
> Mike
>
> PS Maybe it'll head off some replies if I make it clear that this view
> hasn't been generated by code so the "1=1" isn't an accidental artifact It
> was custom written and is definitely supposed to have exactly this
> structure.
>
>
>
>
>
>
>
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-- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: Hately, Mike (LogicaCMG) INET: mike.hately_at_nedl.co.uk Fat City Network Services -- 858-538-5051 http://www.fatcity.com San Diego, California -- Mailing list and web hosting services --------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).Received on Tue Oct 21 2003 - 07:16:52 CDT
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