Database hange for a while

Hi All,
These are my envirnment:
Database: Oracle 8i
Platform: HP Unix -11
Database Size: Production less then 100GB
My database get hange for while during the day time . Total hange time less the 5 to10 minutes. During that time, nobody can login in to it. Even I can not log in to it as sysdba. After few minutes it comes in to regullar mode. I can not see any alert in log file or even does not generate any trace file. I do not know the exact time, but it hange three or four time a day.
I have cheked CPU performance, it had equall load on all the CPU.
If you can provide me query to trace my database and advice, I will be appreciated your help.
Thanks in advance.
Raj

Hi Raj,
I can not see any alert in log file From HPUX? Can you tail the alert log?
Total hange time less the 5 to10 minutes.There is some resource shortage, you need to check the OS layer first:
- Check for RAM swapping:
http://www.dba-oracle.com/t_tuning_cpu_usage_vmstat.htm
Detecting Potential I/O Bottlenecks in AIX is easy. Using IBM's AIX dialect of UNIX, an I/O bound database server is usually evidenced by a high value in the wa (wait) column of vmstat.
Below, we see that 22 percent of the CPU time is being used waiting for database I/O.
root> vmstat
kthr     memory             page              faults        cpu
r b   avm   fre re pi po fr   sr cy in   sy cs us sy id wa
0 0 217485   386 0   0   0   4   14   0 202 300 210 14 19 45 22It is important to note that a high wait value does not always signal an I/O bottleneck. The CPU wait could be due to other factors, and this metric simply means that the CPU is waiting for external OS services.
Now that we understand the basics of the vmstat utility, let's explore an easy method for capturing vmstat data, storing it inside an Oracle table, and producing server performance reports.
If I had to guess, it's a RAM shortage, that would explain why nobody can sign on.
It's also a problem when you cannot get onto the database to see why it;s hanging!

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