Slow Performance with High CPU Usage on 64-bit Linux with Large SGA
(Doc ID 361670.1)
Last updated on AUGUST 04, 2018
Applies to:Oracle Database - Enterprise Edition - Version 18.104.22.168 to 22.214.171.124 [Release 9.2 to 11.2]
Linux OS - Version Enterprise Linux 3.0 and later
IBM: Linux on POWER Big Endian Systems
- System starts to perform very slowly after database instance startup. The slowdown can happen after some uptime
had passed, depending on the workload on the RDBMS instance(s)
- System almost hangs after some time, especially if shared servers (MTS) is configured
- Linux kernel thread kswapd consumes big amount of CPU time
- Linux kernel thread kscand consumes big amount of CPU time (RHEL3***)
- Continuous monitoring using
vmstat -s | grep paged
shows a faster increase in cumulative pagein/pageout statistics.
Some or all of below:
- A new database instance on the system
- Total SGA size and use on the system has increased
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