Uses of CPU high on a Linux machine

Hi all

We have 2 Server database oracle on different locations... the two servers have same hardware and same configuration OS

OS:-RHEL3 (32 bit)
database: Oracle 9.2.0.4

both have same number of simultaneous sessions 187-200, but still the server 1 shows the memory use very high that Server2... I'm not able to find the cause of it... the two servers are running the same application, and it's on the Internet... what could be the reason for this. ??? the server with the senior uses shows

1 db file scattered read
2 db file sequential read
3 SQL * net more data to the client

events in waiting statspack report, I also checked network for traffic and is sustainable by existing network... so what could be the cause high CPU use? I also have data Born vmstat and it shows swpd = 0 US = 14, and free chat and cache memory

any suggestions would be appreciated

Thanks and greetings
VD

Dixit says:

but the other system with the same configuration and almost the same load varies the CPU usage. What is that?

Could be something else causing CPU? Who was carefully checked and updated?

If Yes, then you can profile the CPU usage of the same process to run on both servers and then compare the results - which will tell you what is different.

with above did you mean only slow the e/s disk original problem... that I need to move data faster disks files?

N ° Pages swapped memory in the swap space are written to disk. Pages swapped in memory from the swap space are read on disk. I/o operations are by nature slow. Access to the memory of nature is very fast. So when memory pages must be accessible through I/O, it is a very expensive operation and can cause huge performance problems. This measure is to look at the number of hard page faults (requiring pages to read the disk and in memory) for a process. A large number of page faults means that what must be the operations of memory very fast of this process, is now very slow operations as the pages of memory of this process are mainly in swap space and must be read from the disk. In the case of Oracle, saw it happen to the SGA will have consequences of performance of desire.

report also shows that PGA is not fully used. Take a look at the stainless steel of statspack report

PGA is a collective noun describing dedicated memory allocated in the private process memory space. In simple terms the shared memory is "+ good +" and the dedicated memory is "+ bad +" as the former many processes on this server and this last service can only process a single process. As most of the performance issues, using the PGA is therefore a balance between the amount of non-shareable memory can be used to speed up a single process compared to the amount of memory shared that can be assigned to speed up a process heap.

You must make attention randomly using measures of CPU, i/o and memory in the attempt to anticipate a performance problem. This can lead to OCTD (obsessive-compulsive disorder Tuning). ;-)

You've identified what you think it's an anomaly of CPU usage. So focus on that only. Isolate it. Confirm and identify it. And then solve it. External factors you add (as of huge pages, use of PGA and so on), only obscures the problem and increases the complexity of the determination of the cause of the anomaly.

Tags: Database

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