Linux server hangs and takes time to get a SQLPlus session

[Gaby1110]

Hi,

One of our server is extremely slow to get a SQLPlus session and then execute a simple command.

Intermittently it behaves perfectly but usually it hangs.

top - 22:40:35 up 19 days, 1:34, 4 users, load average: 0.00, 0.00, 0.00
Tasks: 82 total, 1 running, 81 sleeping, 0 stopped, 0 zombie
Cpu(s): 0.0% us, 0.2% sy, 0.2% ni, 99.5% id, 0.2% wa, 0.0% hi, 0.0% si
Mem: 1034564k total, 826072k used, 208492k free, 190200k buffers
Swap: 6291448k total, 0k used, 6291448k free, 549760k cached

[root@]# more /etc/issue
Red Hat Enterprise Linux AS release 4 (Nahant Update 6)
Kernel \r on an \m

[root@]# file /usr/bin/file
/usr/bin/file: ELF 32-bit LSB executable, Intel 80386, version 1 (SYSV), for GNU/Linux 2.2.5, dynamically linked (uses shared libs), stripped
[root@log]#

Kindly help.

Thanks in advance
Gaby