ORA-04030: out of process memory when trying to allocate 16328 bytes (koh-kghu call ,pmucalm coll)

User may encounter below error in 11g. First I would recommend running ADDM report and checking how the resources are utilized. If you see any undersize database configuration then increase.

ORA-04030: out of process memory when trying to allocate 16328 bytes (koh-kghu call ,pmucalm coll)
Incident details in: /u01/home/oracle/diag/rdbms/orac/ORAC/incident/incdir_17129/ORAC_ora_8372_i17129.trc
Use ADRCI or Support Workbench to package the incident.
See Note 411.1 at My Oracle Support for error and packaging details.
Non critical error ORA-48913 caught while writing to trace file "/u01/home/oracle/diag/rdbms/orac/ORAC/incident/incdir_17129/ORAC_ora_8372_i17129.trc"
Error message: ORA-48913: Writing into trace file failed, file size limit [5242880] reached
Writing to the above trace file is disabled for now on...
If your database has enough resources and if you still see the issue then you might need to check the trace file.

=======================================
PRIVATE MEMORY SUMMARY FOR THIS PROCESS
---------------------------------------
******************************************************
PRIVATE HEAP SUMMARY DUMP
4129 MB total:
4129 MB commented, 173 KB permanent
57 KB free (0 KB in empty extents),
2240 MB, 3 heaps: "koh-kghu call " 14 KB free held
1889 MB, 1 heap: "session heap " 4 KB free held
------------------------------------------------------

The trace file confirms that the process is limiting at 4GB. Change the upper limit either at OS level or Database level

Apply this change at OS level
1. Get the page count using below command and increase the limit
#more /proc/sys/vm/max_map_count

2. Increase the page count
#sysctl -w vm.max_map_count= 262144
or
#sysctl vm.max_map_count=262144

3. These changes will be revered on server reboot. To make changes permanent add the value in
$ vi /etc/sysctl.conf
or
$echo “vm.max_map_count = 262144” | tee -a /etc/sysctl.conf

4. You no need to reboot the server, you should reload the config file as root
$ sysctl –p

Apply this change at Database level
Adjust the realfree heap page size by setting below parameters in spfile or pfile and restart the database
_use_realfree_heap=TRUE
_realfree_heap_pagesize_hint = 262144

Note that the default realfree allocator pagesize is 64 kB (65536), so 64K entries take up 4GB. With 256kB (262144) pages, the limit goes to 16GB.

I hope this should resolve your issue.

Regards
Satishbabu Gunukula, Oracle ACE
http://www.oracleracexpert.com