RE: Stored Outline Problem

From: Jamadagni, Rajendra <Rajendra.Jamadagni_at_espn.com>
Date: Wed, 17 Dec 2003 07:19:25 -0800
Message-ID: <F001.005DA2F5.20031217071925@fatcity.com>

I think it is the hash value for sql text .... something like

hash(sql_text_here) ... probably used to do a fast match with trying to lookup outlines ...

Raj

Rajendra dot Jamadagni at nospamespn dot com All Views expressed in this email are strictly personal. QOTD: Any clod can have facts, having an opinion is an art !

-----Original Message-----
Sent: Wednesday, December 17, 2003 10:09 AM To: Multiple recipients of list ORACLE-L

Hi all,

I'm trying to set up stored outlines and am running into the following problem (OUTLN tables are initially empty and the shared pool has just been flushed):

ALTER SESSION SET CREATE_STORED_OUTLINES = TRUE; SELECT 'THISISMYTEST' FROM DUAL; ALTER SESSION SET CREATE_STORED_OUTLINES = FALSE; SQL> SELECT HASH_VALUE,SQL_TEXT FROM OUTLN.OL$; HASH_VALUE SQL_TEXT

---------- ------------------------------------------------------------

1024768383 SELECT 'THISISMYTEST' FROM DUAL SQL> SELECT HASH_VALUE,SQL_TEXT FROM V$SQL WHERE SQL_TEXT LIKE '%THISISMYTEST%'; HASH_VALUE SQL_TEXT

---------- ------------------------------------------------------------

2081312514 SELECT 'THISISMYTEST' FROM DUAL 2452395670 SELECT HASH_VALUE,SQL_TEXT FROM V$SQL WHERE SQL_TEXT LIKE '% THISISMYTEST%' Now (as expected) there is now one row in OUTLN.OL$ but the HASH_VALUE != the HASH_VALUE for the given SELECT statement in v$sql. In fact the HASH_VALUE doesn't match anything in v$sql.

Obviously (and demonstratively) the outline will not be used if the query hashes to a different value that the outline. Am I missing something? (CREATE ANY OUTLINE is granted)

Thanks for any help,
- Bill.

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Author: Bill Buchan
INET: wbuchan_at_uk.intasys.com

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Please see the official ORACLE-L FAQ: http://www.orafaq.net
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Author: Jamadagni, Rajendra
INET: Rajendra.Jamadagni_at_espn.com

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