Thanks for the suggestion. I checked my system and both parameters are set
at 64K, however each PGA can grow to 32GB, not 4GB. Maybe they are obsolete?
On Sun, Mar 19, 2017 at 6:45 AM, Vishal Gupta <vishal@xxxxxxxxxxxxxxx>
Please check *_realfree_heap_pagesize_hint *(at instance level) and*
vm.max_map_count * (cat /proc/sys/vm/max_map_count) at OS level.
*Maximum Process level PGA Memory* - By default each database process on
linux, can take up to 4GB of maximum PGA (Program Global Area) memory.
This maximum limit is determined (_realfree_heap_pagesize_hint at instance
level * vm.max_map_count at OS level) . Default of both these parameters is
64k, so we get default maximum each process level PGA of 4GB.
*vm.max_map_count* – defines the maximum number of VMAs (Virtual Memory
Areas) that a particular process can own. VMA is a continuous area of
virtual address space. This has a default value of 64k (65536)
*_realfree_heap_pagesize_hint* - hint for real-free page size in bytes.
This has a default value of 64k (65536)
*Bug 11852492* : ORA-4030 OCCURS WHEN PGA EXCEEDS 4GB. This is not a bug,
but more of a default configuration, if one requires more than 4GB of PGA
memory then parameter needs to be adjusted.
*From: *<oracle-l-bounce@xxxxxxxxxxxxx> on behalf of Henry Poras <
*Date: *Thursday, 16 March 2017 at 17:19
*To: *ORACLE-L <oracle-l@xxxxxxxxxxxxx>
*Subject: *ORA-04030 possible unix limits??
I am running on Oracle 220.127.116.11
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?