ORA-27300: OS System Dependent Operation: Fork Failed With Status: 12

ALERT LOG ENTRY
Process startup failed, error stack:
Errors in file /u01/app/oracle/diag/rdbms/cbelive/PRODDB2/trace/PRODDB2_psp0_5898502.trc:
ORA-27300: OS system dependent operation:fork failed with status: 12
ORA-27301: OS failure message: Not enough space
ORA-27302: failure occurred at: skgpspawn3
====================CONTENT OF TRACE FILE======================
Trace file /u01/app/oracle/diag/rdbms/cbelive/PRODDB2/trace/PRODDB2_psp0_5898502.trc
Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production
With the Partitioning, Real Application Clusters, Automatic Storage Management, OLAP,
Data Mining and Real Application Testing options
ORACLE_HOME = /u01/app/11.2.0.3/oracle
System name:    AIX
Node name:      t24db2
Release:        1
Version:        6
Machine:        00C941664C00
Instance name: PRODDB2
Redo thread mounted by this instance: 2
Oracle process number: 3
Unix process pid: 5898502, image: oracle@t24db2 (PSP0)

*** 2015-01-27 13:30:39.519
*** SESSION ID:(379.1) 2015-01-27 13:30:39.519
*** CLIENT ID:() 2015-01-27 13:30:39.519
*** SERVICE NAME:(SYS$BACKGROUND) 2015-01-27 13:30:39.519
*** MODULE NAME:() 2015-01-27 13:30:39.519
*** ACTION NAME:() 2015-01-27 13:30:39.519

Process startup failed, error stack:
ORA-27300: OS system dependent operation:fork failed with status: 12
ORA-27301: OS failure message: Not enough space
ORA-27302: failure occurred at: skgpspawn3

*** 2015-01-27 13:32:50.138
Process startup failed, error stack:
ORA-27300: OS system dependent operation:fork failed with status: 12
ORA-27301: OS failure message: Not enough space
ORA-27302: failure occurred at: skgpspawn3

*** 2015-01-27 13:33:24.157
Process startup failed, error stack:
ORA-27300: OS system dependent operation:fork failed with status: 12
ORA-27301: OS failure message: Not enough space
ORA-27302: failure occurred at: skgpspawn3
~
===========================================================

CAUSE


Insufficient paging space defined for the system program using excessive amount of paging space.

SOLUTION

Increase the OS paging space.

For AIX, the next APAR is advised:

Fix pack for: IZ19670: CANNOT INCREASE PAGING SPACE UNDER LOAD APPLIES TO AIX 6100-01

Please note the specific patches below:
  5300-09 - use AIX APAR IZ19504
  6100-01 - use AIX APAR IZ19670
  6100-02 - use AIX APAR IZ20052

For more information, please visit:
https://www-304.ibm.com/support/docview.wss?uid=isg1IZ19670