Re: sql with SQL_OPCODE=0
- From: Dion Cho <ukja.dion@xxxxxxxxx>
- To: denis.sun@xxxxxxxxx
- Date: Wed, 1 Dec 2010 10:11:46 +0900
Instead of V$SQL, search X$KGLOB, which is the mother of V$SQL.
select kglnaobj
from x$kglob
where kglobt03 = '6s8fdgnw2u49h'
;
================================
Dion Cho - Oracle Performance Storyteller
http://dioncho.wordpress.com (english)
http://ukja.tistory.com (korean)
http://sites.google.com/site/otpack (tpack)
================================
2010/12/1 Denis <denis.sun@xxxxxxxxx>
> Hi,
> Yesterday, after adding a datafile to a busy system, performance degraded.
> Run the ASH report during problem period, noticed a SQL with
> sql_id=6s8fdgnw2u49h as the top SQL:
>
> -------------------------------------------------------------
> Top SQL Statements DB/Inst: XXXXXX/XXXXX (Nov 29 16:20 to 16:30)
> SQL ID Planhash % Activity Event %
> Event
> ------------- ----------- ---------- ------------------------------
> ----------
> 6s8fdgnw2u49h N/A 69.67 CPU + Wait for CPU
> 69.11
> ** SQL Text Not Available **
>
> However, I can not find the sql_text anywhere.
> Today, I noticed that many sessions acutually run this sql as routines.
> for example:
>
> select sample_time, sql_id, sql_opcode, SESSION_TYPE from
> v$active_session_history where session_id=882;
>
> SAMPLE_TIME SQL_ID SQL_OPCODE SESSION_TY
> --------------------------------- ------------- ---------- ----------
> 30-NOV-10 06.22.02.843 PM abd2dmdpvjvy5 3 FOREGROUND
> 30-NOV-10 06.21.31.493 PM 1azxzyptvjvvs 3 FOREGROUND
> 30-NOV-10 06.21.30.483 PM 54pdffnh5xgb7 3 FOREGROUND
> ....
> 30-NOV-10 06.17.30.468 PM gkuyk6gjc1tn6 3 FOREGROUND
> 30-NOV-10 06.16.58.038 PM 0 FOREGROUND
> 30-NOV-10 06.16.57.028 PM 6s8fdgnw2u49h 0 FOREGROUND
> ======> sql_id
> 30-NOV-10 06.16.49.951 PM 3kbr7bthvwqkx 3 FOREGROUND
> 30-NOV-10 06.15.26.961 PM cfm8mwq01sg68 3 FOREGROUND
> 30-NOV-10 06.15.18.861 PM 54pdffnh5xgb7 3 FOREGROUND
> 30-NOV-10 06.13.59.864 PM 0 FOREGROUND
> 30-NOV-10 06.13.42.674 PM 0 FOREGROUND
> 30-NOV-10 06.12.24.736 PM 54pdffnh5xgb7 3 FOREGROUND
> .....
> My question is in which situation we have sql_id but don't have sql_text in
> v$sql or dba_hist_sqltext? what's the meaning of SQL_OPCODE=0 ? Appreciate
> anyone can shed some lights on this.
>
> Denis
>
>
>
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