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>
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>
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$sqlarea.text as well.
Interestingly, oradebug current_sql shows a much longer text. It’s
possible that this is the unparsed text – the Oracle dedicated server
process has the full text all the time, but it’s just not externalized
until the parsing is over. Unfortunately, this text is trimmed – maybe by
the oradebug presentation layer code.
Best regards,
Nenad
*From:* oracle-l-bounce@xxxxxxxxxxxxx <oracle-l-bounce@xxxxxxxxxxxxx> *On
Behalf Of *Jonathan Lewis
*Sent:* Montag, 12. Juli 2021 19:08
*To:* ORACLE-L (oracle-l@xxxxxxxxxxxxx) <oracle-l@xxxxxxxxxxxxx>
*Subject:* Re: sql_text during parsing
I was just looking back at a note I wrote a few years ago (
https://jonathanlewis.wordpress.com/2017/10/03/parsing ;) about invalid
SQL getting into the library cache (x$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>
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>; ORACLE-L (oracle-l@xxxxxxxxxxxxx)
<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>
Sent: Montag, 12. Juli 2021 17:28
To: Noveljic Nenad <nenad.noveljic@xxxxxxxxxxxx>; ORACLE-L (
oracle-l@xxxxxxxxxxxxx) <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> hat am 12.07.2021 17:25geschrieben:
WHEN (CASE WHEN (CASE WHEN (CASE WHEN ((CASE WHEN ((CASE WHEN (((CASE WHEN …
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
____________________________________________________
The problem might be with the parsing of a nested case.
Have to get the full text to experiment.
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