Oracle-L: RE: Slow running query

From: Naveen Nahata <naveen_nahata_at_mindtree.com>
Date: Mon, 27 Jan 2003 06:29:32 -0800
Message-ID: <F001.0053AFD2.20030127062932@fatcity.com>

First thought,

Count(*) and FIRST_ROWS are self contradictory. If you want to count all the records, how will first_rows help?

Regards
Naveen

-----Original Message-----
[mailto:Ranganath.Krishnaswamy_at_blr.hpsglobal.com] Sent: Monday, January 27, 2003 6:34 PM
To: Multiple recipients of list ORACLE-L

Hi List:

I have the below query which is taking 5 min. 20 sec. to fetch the records. Can you please let me know as to how do I reduce the responste time? I have created indexes on Fahrzeug.FZGBRIEF and Historie.mytechobjekt and also the Oid column is uniquely indexed. I replaced the FIRST_ROWS hint with RULE hint as a result of which it is taking 3-4 min.

select /*+FIRST_ROWS*/ count(*)

from

ZPAB.FZGBRIEF B1, ZPAB.FAHRZEUG F1, ZPAB.HISTORIE H1 where

F1.FZGBRIEF = B1.OID AND F1.OID = H1.MYTECHOBJEKT(+) AND (H1.CCCONTROL IN(1, 2, 3) OR NOT EXISTS

	(SELECT /*+INDEX_FFS(HISTORIE, I_MYTECHOBJEKT) */ ZPAB.FAHRZEUG.OID
	FROM ZPAB.FAHRZEUG,ZPAB.HISTORIE 
	
	WHERE ZPAB.FAHRZEUG.OID = ZPAB.HISTORIE.MYTECHOBJEKT and
	
	ZPAB.FAHRZEUG.oid=F1.oid))
	
	AND F1.AMTLICHESKENNZEICHEN LIKE 'DD%'

Any help in this regard is very much appreciated.

Thanks and Regards,

Ranganath
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Author: Krishnaswamy, Ranganath
INET: Ranganath.Krishnaswamy_at_blr.hpsglobal.com

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Author: Naveen Nahata
INET: naveen_nahata_at_mindtree.com

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