Problem in the SQL because of the order by clause
Hi allI am facing a problem in a sql query. I use Oracle 10 g 2.
Query is given below:
SELECT t1.ename
FROM T1, T2
WHERE T1.EMPNO = 1234
AND T1.ACCOUNTNO = T2.ACCOUNTNO
AND T1.SEQ = T2.SEQ
ORDER BY T2.SEQ.----------------------------------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
----------------------------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 2 | 218 | 11716 (1)| 00:00:41 |
|* 1 | TABLE ACCESS BY INDEX ROWID | T1 | 1 | 89 | 1 (0)| 00:00:01 |
| 2 | NESTED LOOPS | | 2 | 218 | 11716 (1)| 00:00:41 |
|* 3 | TABLE ACCESS BY INDEX ROWID| T2 | 2 | 40 | 11715 (1)| 00:00:41 |
| 4 | INDEX FULL SCAN | PK_T2_SEQ | 58752 | | 122 (5)| 00:00:01 |
|* 5 | INDEX RANGE SCAN | FK_ACCOUNTNO | 3 | | 0 (0)| 00:00:01 |
----------------------------------------------------------------------------------------------------If I remove order by clause query that the query performance is quite perfect, but with order by clause its take time.
I already set SORT_AREA_SIZE, but still nothing improves.
Welcome and thank you for your suggestions.
Thank you
Published by: BluShadow on June 23, 2011 07:55
addition of {noformat}
{noformat} tags and formatted explain plan to make it readable. Please see {message:id=9360002} for details on how to post code and data Hey, a quick test, try:
select ename from (
SELECT t1.ename, T2.SEQ
FROM T1, T2
WHERE T1.EMPNO = 1234
AND T1.ACCOUNTNO = T2.ACCOUNTNO
AND T1.SEQ = T2.SEQ
and rownum > 0)
ORDER BY SEQ
Amiel Davis
Tags: Database
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