RE: sql_text during parsing
- From: Noveljic Nenad <nenad.noveljic@xxxxxxxxxxxx>
- To: Sayan Malakshinov <xt.and.r@xxxxxxxxx>
- Date: Mon, 12 Jul 2021 19:22:17 +0000
Thank you!
I slightly adapted it for my case:
alter system set events 'trace [SQL_Optimizer.*][sql: 99g4t6h9kfumw]
{callstack: fname opiParse} disk=low errorstack(2)' ;
From: Sayan Malakshinov <xt.and.r@xxxxxxxxx>
Sent: Montag, 12. Juli 2021 20:59
To: Noveljic Nenad <nenad.noveljic@xxxxxxxxxxxx>
Cc: Mohamed Houri <mohamed.houri@xxxxxxxxx>; jlewisoracle@xxxxxxxxx; ORACLE-L
(oracle-l@xxxxxxxxxxxxx) <oracle-l@xxxxxxxxxxxxx>
Subject: Re: sql_text during parsing
Finally I could get it using this:
Full example with full output:
https://gist.github.com/xtender/1d26e45df88084655d49cf06d4fb9a7d
alter session set tracefile_identifier='compiler7';
alter session set events 'trace [SQL_Compiler]{callstack: fname opiParse}
disk=low errorstack(2)';
declare csql clob:='select/*+ findme*/ 1 x0';
begin
for i in 1..500 loop
csql:=csql || rpad(',1',40,'0') || ' x'||i;
end loop;
csql:=csql||' () from dual';
execute immediate csql;
end;
/
disc
Results (I've removed some parts to make it shorter and more readable):
$ grep "sql=" *compiler7.trc
sql=select/*+ findme*/ 1 x0,100<<< removed >>> 00000000000000
x92,100000000000000000000000000000000
sql=000000 x93,1000000000000000<<< removed >>> 00000
x183,100000000000000000000000000000000000000 x
sql=184,10000000000000000000000<<< removed >>> 0000
x274,100000000000000000000000000000000000000 x2
sql=75,100000000000000000000000<<< removed >>> 000
x365,100000000000000000000000000000000000000 x36
sql=6,1000000000000000000000000<<< removed >>> 00
x456,100000000000000000000000000000000000000 x457
sql=,10000000000000000000000000<<< removed >>>
,100000000000000000000000000000000000000 x500 () from dual
sql=select/*+ findme*/ 1 x0,100<<< removed >>> 00000000000000
x92,100000000000000000000000000000000
sql=000000 x93,1000000000000000<<< removed >>> 00000
x183,100000000000000000000000000000000000000 x
sql=184,10000000000000000000000<<< removed >>> 0000
x274,100000000000000000000000000000000000000 x2
sql=75,100000000000000000000000<<< removed >>> 000
x365,100000000000000000000000000000000000000 x36
sql=6,1000000000000000000000000<<< removed >>> 00
x456,100000000000000000000000000000000000000 x457
sql=,10000000000000000000000000<<< removed >>>
,100000000000000000000000000000000000000 x500 () from dual
On Mon, Jul 12, 2021 at 9:57 PM Noveljic Nenad
<nenad.noveljic@xxxxxxxxxxxx<mailto:nenad.noveljic@xxxxxxxxxxxx>> wrote:
Thank you, Sayan.
I set it up and will let you know tomorrow.
Best regards,
Nenad
From: Sayan Malakshinov <xt.and.r@xxxxxxxxx<mailto:xt.and.r@xxxxxxxxx>>
Sent: Montag, 12. Juli 2021 19:44
To: Mohamed Houri <mohamed.houri@xxxxxxxxx<mailto:mohamed.houri@xxxxxxxxx>>
Cc: Noveljic Nenad
<nenad.noveljic@xxxxxxxxxxxx<mailto:nenad.noveljic@xxxxxxxxxxxx>>;
jlewisoracle@xxxxxxxxx<mailto:jlewisoracle@xxxxxxxxx>; ORACLE-L
(oracle-l@xxxxxxxxxxxxx<mailto:oracle-l@xxxxxxxxxxxxx>)
<oracle-l@xxxxxxxxxxxxx<mailto:oracle-l@xxxxxxxxxxxxx>>
Subject: Re: sql_text during parsing
And without "errorstack" to make it smaller:
alter session set tracefile_identifier='compiler2';
alter session set events 'trace [SQL_Compiler.*] disk=high';
select () from dual;
disc
]$ grep -A5 "Parsing cur" *compiler2*
ORA19_ora_26811_compiler2.trc:Parsing cur#=5 sqlid=0g4um7fjk6mg4 len=20
ORA19_ora_26811_compiler2.trc-sql=select () from dual
On Mon, Jul 12, 2021 at 8:40 PM Sayan Malakshinov
<xt.and.r@xxxxxxxxx<mailto:xt.and.r@xxxxxxxxx>> wrote:
Nenad,
I've just ran short test with ORA-00936: missing expression:
SQL> select () from dual
*
ERROR at line 1:
ORA-00936: missing expression
Test case:
alter session set tracefile_identifier='compiler';
alter session set events 'trace [SQL_Compiler.*] disk=high errorstack(2)';
select () from dual;
disc
And got it in the trace file:
# grep -A2 -B5 "Parsing cur" *compiler*
ts:1626111216[07/12/2021 17:33:36] [1000:55926] type:3 [MASTER UPD MIN-SCN]
inst#:0 inc#:0 min-scn: 0x0000000000414df9 global-recent-scn:
0x000000000068c2a4 calc-scn: 0x000000000068c2a5
grec-scn: 0x000000000068c2a4 gmin-scn: 0x0000000000414df9 calc-scn:
0x000000000068c2a5
scn-map not available - probably slave
End Dumping Min-Act Trace
----- Pluggagle DB Traces -----
Parsing cur#=5 sqlid=0g4um7fjk6mg4 len=20
sql=select () from dual
So at least we can be sure that parse errors are traced by "SQL_Compiler"
On Mon, Jul 12, 2021 at 8:31 PM Mohamed Houri
<mohamed.houri@xxxxxxxxx<mailto:mohamed.houri@xxxxxxxxx>> wrote:
Nenad
In a case similar to yours I was saved by to dba_hist_sqltext :-)
select sql_text from dba_hist_sqltext where sql_id = '6tcs65pchhp71';
https://hourim.wordpress.com/2018/03/17/library-cache-lock/
Best regards
Mohamed
Le lun. 12 juil. 2021 à 19:20, Noveljic Nenad
<nenad.noveljic@xxxxxxxxxxxx<mailto:nenad.noveljic@xxxxxxxxxxxx>> a écrit :
This statement could be considered invalid because it failed parsing (due to
memory allocation error).
The same text (~ 20 characters long) was shown in v$sqlarea.text as well.
Interestingly, oradebug current_sql shows a much longer text. It’s possible
that this is the unparsed text – the Oracle dedicated server process has the
full text all the time, but it’s just not externalized until the parsing is
over. Unfortunately, this text is trimmed – maybe by the oradebug presentation
layer code.
Best regards,
Nenad
From: oracle-l-bounce@xxxxxxxxxxxxx<mailto:oracle-l-bounce@xxxxxxxxxxxxx>
<oracle-l-bounce@xxxxxxxxxxxxx<mailto:oracle-l-bounce@xxxxxxxxxxxxx>> On Behalf
Of Jonathan Lewis
Sent: Montag, 12. Juli 2021 19:08
To: ORACLE-L (oracle-l@xxxxxxxxxxxxx<mailto:oracle-l@xxxxxxxxxxxxx>)
<oracle-l@xxxxxxxxxxxxx<mailto:oracle-l@xxxxxxxxxxxxx>>
Subject: Re: sql_text during parsing
I was just looking back at a note I wrote a few years ago (
https://jonathanlewis.wordpress.com/2017/10/03/parsing ;) about invalid SQL
getting into the library cache (x$kglob) even though not being made visible
through v$sql; and I've only just noticed that the content was trimmed to the
first 20 charactes - which is the same as the fragment that you found with the
query.I suggested. So now I'm wondering whether it's just a small chunk acting
as a place-holder in the library cache, until the parse is complete - although
this comment from Liron Amitzi on the blog note suggests it might be the whole
thing: https://jonathanlewis.wordpress.com/2017/10/03/parsing/#comment-101173
Regards
Jonathan Lewis
On Mon, 12 Jul 2021 at 17:52, Noveljic Nenad
<nenad.noveljic@xxxxxxxxxxxx<mailto:nenad.noveljic@xxxxxxxxxxxx>> wrote:
A combination of Andy's and Jonathan's ideas to try tomorrow:
set long 10000
oradebug setospid ...
oradebug current_sql
Best regards,
Nenad
-----Original Message-----
From: Noveljic Nenad
Sent: Montag, 12. Juli 2021 18:35
To: 'Stefan Koehler' <contact@xxxxxxxx<mailto:contact@xxxxxxxx>>; ORACLE-L
(oracle-l@xxxxxxxxxxxxx<mailto:oracle-l@xxxxxxxxxxxxx>)
<oracle-l@xxxxxxxxxxxxx<mailto:oracle-l@xxxxxxxxxxxxx>>
Subject: RE: sql_text during parsing
Hi Stefan,
I suspended the process during parsing and got the process dump and error stack
trace, but nothing.
My guess is that the statement is properly registered in the memory (from the
Oracle C code perspective) only after the parsing.
Unless someone comes up with a better idea, I'll ask Tableau people tomorrow if
they could trace generated SQLs on the client.
Otherwise, I have to look for SQL text in the process private memory. In 12c,
the second argument to the first qcplgte call (there are many recursive calls
to this function) contained the pointer to a structure which contained the
pointer to SQL text. I'll start from there.
Best regards,
Nenad
-----Original Message-----
From: Stefan Koehler <contact@xxxxxxxx<mailto:contact@xxxxxxxx>>
Sent: Montag, 12. Juli 2021 17:28
To: Noveljic Nenad
<nenad.noveljic@xxxxxxxxxxxx<mailto:nenad.noveljic@xxxxxxxxxxxx>>; ORACLE-L
(oracle-l@xxxxxxxxxxxxx<mailto:oracle-l@xxxxxxxxxxxxx>)
<oracle-l@xxxxxxxxxxxxx<mailto:oracle-l@xxxxxxxxxxxxx>>
Subject: RE: sql_text during parsing
Hello Nenad,
any chance with a process state dump (or error stack trace)?
Best Regards
Stefan Koehler
Independent Oracle performance consultant and researcher
Website: http://www.soocs.de
Twitter: @OracleSK<
Noveljic Nenad
<nenad.noveljic@xxxxxxxxxxxx<mailto:nenad.noveljic@xxxxxxxxxxxx>> hat am
12.07.2021 17:25 geschrieben:
Thanks!
I got a part of SQL (it’s chopped)
Any idea for getting the full text?
SQL> oradebug setospid 17876
Oracle pid: 107, Unix process pid: 17876, image: oracle@svdbp02p
SQL> oradebug current_sql
SELECT (CASE WHEN ((CASE WHEN (CASE WHEN (CASE WHEN (CASE WHEN (CASE WHEN
(CASE WHEN (CASE WHEN (CASE WHEN ((CASE WHEN ((CASE WHEN (((CASE WHEN …
The problem might be with the parsing of a nested case.
Have to get the full text to experiment.
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Oracle ACE Associate
http://orasql.org
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