Re: Ora error while during explain plan

2 minutes to parse "select 1 from dual" sounds like a memory problem - it may be that the problem will disappear if you restart the instance.

Before doing that, though, I'd enable extended (level 12, i.e. waits and binds) sql-trace and repeat the explain plan for select 1 from dual to see if the resulting trace file showed me exactly what happened just before the error occurred - I'd guess that some recursive SQL that was trying to load something into the dictionaty cache was running into a problem. If that trace doesn't give you any clues I'd try the same with the simplest possible statement that does cause the ORA-00600.

Regards
Jonathan Lewis

On Wed, 10 Mar 2021 at 11:00, Pap <oracle.developer35_at_gmail.com> wrote:

> Hi All, Oracle version is - 12.1.0.2.0 and its Exadata. I am seeing
> Ora-600 while fetching explain plan through "set autotrace traceonly
> explain". Even explain plan for "Select 1 from dual" is working but that is
> also taking ~2minutes and that too failing with the same Ora-600 for other
> queries. I got a related bug from mos, but the work around which is
> provided as setting "_optimizer_push_pred_cost_based" to false is also
> not working, which means we are hitting some other bug. Has anybody
> encountered such a scenario?
>
> Explain Plan for Query Errors with 'ORA-00600: internal error code,
> arguments: [KGL-heap-size-exceeded]' (Doc ID 2469727.1)
>
> SQL> select 1 from dual;
>
>
> Execution Plan
>
> ----------------------------------------------------------
>
> ERROR:
>
> ORA-00600: internal error code, arguments: [ktrenvchk_1], [0], [1], [0],
> [1],
>
> [0], [0], [0], [], [], [], []
>
>
>
>
> SP2-0612: Error generating AUTOTRACE EXPLAIN report
>

--
http://www.freelists.org/webpage/oracle-l