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: Jamadagni, Rajendra
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