RE: sql_id in ADS trace

From: Noveljic Nenad <nenad.noveljic_at_vontobel.com>
Date: Thu, 28 Jun 2018 14:21:54 +0000
Message-ID: <77834_1530195726_5B34EF0E_77834_10197_1_ECDEF0CC6716EC4596FCBC871F48292AB19C4426_at_ZRH-S231>


Thank you, Stefan.

=> Just remove the hints in the external query block (from SQL trace) and then you got the stored SQL_ID

This was helpful. I ran the DS sql and queried the v$sql.sql_id

SELECT /* DS_SVC */ NVL(SUM(C1),0) FROM (SELECT /*+ qb_name("innerQuery") NO_INDEX_FFS( "T1#1") */ 1 AS C1 FROM "T1" "T1#1", "T2" "T2#0" WHERE ("T2#0"."N2"=2) AND ("T1#1"."N1"="T2#0"."N1") AND ("T1#1"."N2"=2) AND ("T1#1"."N3"=2)) innerQuery ;

select sql_id from v$sql where sql_text like 'SELECT /* DS_SVC */ NVL(%' ;

SQL_ID
7wckkp93ya8a2

=> set fix_control #22760704 to 0 to get rid of this mix-up

As a result, the stored sql_id doesn't match any more, because the hints are not removed after deactivating the bug fix.

I'm still wandering whether there's a simple function for converting the sql_id encoded in the ADS trace to the conventional format.

Best regards,

Nenad

http://nenadnoveljic.com/blog/

-----Original Message-----
From: Stefan Koehler [mailto:contact_at_soocs.de] Sent: Donnerstag, 28. Juni 2018 15:52
To: ORACLE-L (oracle-l_at_freelists.org); Noveljic Nenad Subject: Re: sql_id in ADS trace

Hello Nenad,

> How can I convert the sql_id from the RDBMS.ADS into the conventional format?

Short version: Just remove the hints in the external query block (from SQL trace) and then you got the stored SQL_ID or set fix_control #22760704 to 0 to get rid of this mix-up.

Long version: Mauro's blog post - https://mauro-pagano.com/2016/11/28/something-new-about-sql-plan-directives-and-12-2/

Best Regards
Stefan Koehler

Independent Oracle performance consultant and researcher Website: http://www.soocs.de
Twitter: _at_OracleSK

> Noveljic Nenad <nenad.noveljic_at_vontobel.com> hat am 28. Juni 2018 um 15:42 geschrieben:
>
> A DYNAMIC_SAMPLING_RESULT sql plan directive got created for a join cardinality misestimate.
>
> The dynamic sampling sql_id stored in notes is 7wckkp93ya8a2:
>
> NEWNO{(V.T1, num_rows=1001000) - (V.T2, num_rows=1001) - (SQL_ID:7wckkp93ya8a2, T.CARD=943807[-2 -2])}
>
> The sql_id in the RDBMS.ADS trace is encoded differently:
>
> kkoadsComputeSqlid: sql_id=9093421488918569282: newText=SELECT /* DS_SVC */ NVL(SUM(C1),0) FROM (SELECT /*+ qb_name("innerQuery") NO_INDEX_FFS( "T1#1") */ 1 AS C1 FROM "T1" "T1#1", "T2" "T2#0" WHERE ("T2#0"."N2"=2) AND ("T1#1"."N1"="T2#0"."N1") AND ("T1#1"."N2"=2) AND ("T1#1"."N3"=2)) innerQuery, startPos = 20, stopPos = 120, newTextLen = 244, sqlLen = 343
>
> How can I convert the sql_id from the RDBMS.ADS into the conventional format?
>
> Many thanks in advance.
>
> Nenad
> http://nenadnoveljic.com/blog/



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i0zX+n{+i^ Received on Thu Jun 28 2018 - 16:21:54 CEST

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