Comments on: SQL_ID is just a fancy representation of hash value

By: Teymur Hajiyev

Teymur Hajiyev — Thu, 03 Jun 2010 06:30:32 +0000

Excellent!

By: Tanel Poder

Tanel Poder — Fri, 21 May 2010 07:02:11 +0000

@SKY You need to use DBMS_FGA / fine grained auditing if you want to capture all SQL IDs of executed SQL. It'll impact your db performance though

By: SKY

SKY — Fri, 21 May 2010 03:55:50 +0000

hello,

I m very happy with these notes. I have also a question!
i want to capture sql statement into table through trigger…

By: Patrick

Patrick — Thu, 08 Apr 2010 10:30:34 +0000

@Prashant
actually from 10g onwards
rgds
patrick boulay

******************************************************************
SQL*Plus: Release 10.2.0.4.0 – Production on Thu Apr 8 12:28:15 2010

Connected to:
Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 – 64bit Production
With the Partitioning, Real Application Clusters, Data Mining and Real Application Testing options

SQL> select dbms_utility.SQLID_TO_SQLHASH(’29schpgjyfxux’) hash_value FROM DUAL;

HASH_VALUE
———-
3823597405

By: 关于sql_id与hash_value « a db thinker's home

关于sql_id与hash_value « a db thinker's home — Fri, 02 Apr 2010 15:56:54 +0000

[...] 而同时根据Tanel Poder的blog SQL_ID is just a fancy representation of hash value的内容以及后续的Comment,我们可以得知,SQL_ID为此hash值的后32位,而hash_value [...]

By: Calculate SQL_ID and SQL_HASH_VALUE from SQL text | Tanel Poder's blog: Core IT for Geeks and Pros

Wed, 31 Mar 2010 17:39:13 +0000

[...] time ago I wrote an article about the 10g+ SQL_ID being just a hash value of the SQL statement text. It’s just like the [...]

By: Oracle sql_id and hash value » Musings on Database Security

Oracle sql_id and hash value » Musings on Database Security — Tue, 30 Mar 2010 18:01:57 +0000

[...] published a great post a while ago talking about Oracle’s sql_id and hash values in Oracle 10g+. I wanted to be able [...]

By: Rakesh

Rakesh — Fri, 19 Mar 2010 20:48:07 +0000

Very interesting stuff. Thanks Tanel.

Could you please add some more information on Parent/Child Cursor? Also how long cursor information in retained in v$sql.

Thank You

By: Tanel Poder

Tanel Poder — Mon, 01 Mar 2010 05:37:56 +0000

Hi David,

Cool Stuff! I’ve also written something similar – for searching stuff from AWR by partial SQL_ID…

By: David

David — Sun, 28 Feb 2010 19:10:33 +0000

@Tanel Poder
Thank you for this. Even though Oracle provide a function, this has enabled me to work out how to reverse it. I wanted to be able to try and find part of the SQL_ID from the hash value. I can get the last 5 or 6 characters, and that is good enough. I often use OraSRP to profile Trace files, that reveals hash values, and sometimes it is useful to look for the SQL_ID in either the ASH data or the AWR repository.

CREATE OR REPLACE FUNCTION h2i (p_hash_value NUMBER) RETURN VARCHAR2 IS
l_output VARCHAR2(8) := ”;
BEGIN
FOR i IN (
select substr(’0123456789abcdfghjkmnpqrstuvwxyz’, 1+floor(mod(p_hash_value/(POWER(32,LEVEL-1)),32)),1) sqlidchar
FROM dual
CONNECT BY LEVEL <= LN(p_hash_value)/LN(32)
ORDER BY LEVEL DESC
) LOOP
l_output := l_output || i.sqlidchar;
END LOOP;
RETURN l_output;
END;
/