Re: ORA-04030 possible unix limits??

Stefan,

That doc looks interesting. Wish I knew more about _use_realfree_heap. Doing some searching (my current setting is TRUE). Also wonder if the 16GB hard limit mentioned in that doc could also be 32 GB as I am seeing.

Henry

On Thu, Mar 16, 2017 at 3:02 PM, Stefan Koehler <contact_at_soocs.de> wrote:

> Hey Henry,
>
> > Could there be another place that Linux is limiting the process?
>
> Linux x86_64 has a theoretically VAS (virtual address space -
> https://www.kernel.org/doc/Documentation/x86/x86_64/mm.txt) limit of 128
> TB :-)
>
>
> > Has the Oracle PGA allocation changed in 12c?
>
> Yes and no (depends on what you compare it with). Realfree memory
> management / allocator ( mmap() and munmap() ) was introduced with Oracle
> 9i and
> there was a limit of 16 GB when using it. However this limit was raised to
> 80 GB by bug fix #14119856 but personally i have never tested it as my lab
> does not have 80 GB of RAM - i am just a poor independent guy, you know ;-)
>
> Just try to disable realfree memory management / allocator (SQL> alter
> system set "_use_realfree_heap"=FALSE;) and check if you can use more heap
> memory.
>
> Best Regards
> Stefan Koehler
>
> Independent Oracle performance consultant and researcher
> Website: http://www.soocs.de
> Twitter: _at_OracleSK
> Upcoming online seminar: http://tinyurl.com/17-06-13-Shared-Pool-Internals
>
> > Henry Poras <henry.poras_at_gmail.com> hat am 16. März 2017 um 18:19
> geschrieben:
> >
> > I am running on Oracle 12.1.0.2
> >
> > We are currently getting 4030 (timobj call) which I have tracked to an
> aggregate function which is instantiating lots of (untunable) pga memory.
> >
> > Our pga_aggregate_target is 700GB and
> > our pga_aggregate_limit is 900G
> >
> > We are not coming close to using our aggregate memory, yet the process
> is erroring out at 32GB. I am trying to see if this is an Oracle limit (in
> > the past versions, this kind of untunable allocation would continue to
> rise) or a linux one.
> >
> > I have checked both ulimit -a and ulimit -Hm with both being unlimited.
> Could there be another place that Linux is limiting the process? Has the
> > Oracle PGA allocation changed in 12c?
> >
> > Thanks.
> >
> > Henry
>
>

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