OS system dependent operation : fork failed

Question

Hi,
My application server is running with Java and Oracle 10g (10.2.0.4). From last 2-3 days I noticed that in application server log file there are frequent error like ORA-12518: TNS:listener could not hand off client connection but when I checked my oracle server log file then following errors found :
ORA-27300: OS system dependent operation:fork failed with status: 11
ORA-27301: OS failure message: Resource temporarily unavailable
ORA-27302: failure occurred at: skgpspawn5
ORA-27303: additional information: skgpspawn5
My application server and database server both running with linux plateform.
Kindly suggest me how to resolve it.
Regards

Answer 1

Create a script with the following code and run as root:
--- begin ---
#!/bin/bash
echo -n "Connections TCP: "
netstat -an | grep -i tcp | wc -l
echo -n "Connections UDP: "
netstat -an | grep -i udp | wc -l
echo -n "Processes: "
ps -fu oracle | wc -l
--- end ---
The last line above assumes that your OS user is "oracle".
Also check your "oracle" user limits:
$ ulimit -a
You may also try to restart the listener.
If the problem still happens, insert the following line on your $ORACLE_HOME/netword/admin/listener.ora:
TRACE_LEVEL_LISTENER = SUPPORT
A trace file should be created on $ORACLE_HOME/netword/trace/ upon listener restart.