first thing to do, try to use count(a_column_name) instead of count(*)
- Original Message -----
To: "Multiple recipients of list ORACLE-L" <ORACLE-L_at_fatcity.com>
Sent: Monday, January 27, 2003 2:29 PM
> 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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Received on Mon Jan 27 2003 - 08:59:15 CST
