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  #1 (permalink)  
Old February 23rd, 2006, 10:10 AM
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Default query tuning

Hi,
   I had two tables A & B having one common key.I created some indexes.Even thou performance not improved.I created views also,even after that performance not all improved.The query is as below.

SELECT a.customer_id , a.customer_code custCode
FROM A a ,B b
WHERE ROWNUM < 1000
AND a.Country_code = 'US'
AND UPPER(b.first_name) LIKE (:QueryStrFN)
AND (a.is_master = 'Y' OR a.is_master IS NULL)
AND b.customer_id = a.customer_id
ORDER BY custCode


Give me any suggestions/tips for the above query tuning.


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Old April 5th, 2006, 12:12 AM
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Default

Query tuining, itself is a large issue

Here are some tips
1) Find out using explain plan, whether index(s) is/are used by query or not.
2) If not give hint to optimiser
3) In "where" clause write joining conditions first, folowed by other.
4)If possible write query based on table, instead of view.

Regards
Milind
Then check explain plan





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