Re: Reproducing ORA-04036

From: Mladen Gogala <gogala.mladen_at_gmail.com>
Date: Sat, 22 Aug 2020 20:59:09 -0400
Message-ID: <0f9a2d5691236beb17d50a778088d87db1497f4a.camel_at_gmail.com>



Hi Nenad, The error you want to replicate is the following: ORA-04036: PGA memory used by the instance exceeds PGA_AGGREGATE_LIMIT. Basically, you need to allocate PL/SQL structure larger than the  PGA_AGGREGATE_LIMIT. OS page size on Intel compatible chips is 4K, so I would create a PL/SQL table of CHAR[4096] (fixed length, not VARCHAR2) and keep inserting into the table until you break the limit. That is the same as the question of how do you break the speed limit on a highway? Keep pushing the pedal until you see the rotating lights in your rear-view mirror.Regards
On Fri, 2020-08-21 at 12:49 +0000, Noveljic Nenad wrote:
> Anybody has a script for reproducing ORA-04036 in 19c? Allocating
> PL/SQL collections doesn’t trigger the error:
>
> SQL> select max(pga_alloc_mem)/power(1024,2) from v$process ;
>
>
>
> MAX(PGA_ALLOC_MEM)/POWER(1024,2)
>
> --------------------------------
>
> 6466.71202
>
>
>
> SQL> show parameter pga
>
>
>
> PARAMETER_NAME TYPE VALUE
>
> ------------------------------------------------------------ --------
> --- ---------------------------------------------------------------
> -------------------------------------
>
> pga_aggregate_limit big integer 2G
>
>
>
>
>
> SQL> !dbhome
>
> .../product/19.7.0.0.200414
>
> I had a nice test case with excessive PGA allocations during parsing
> in 12c, but “unfortunately” Oracle fixed that problem.
>
> Best regards,
>
> Nenad
>
> https://nenadnoveljic.com/blog/about
>
>
>
>
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-- 
Mladen Gogala

Database Consultant

Tel: (347) 321-1217


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Received on Sun Aug 23 2020 - 02:59:09 CEST

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