Database - RAC/Scalability (MOSC)

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LMSn processes are top CPU users

edited Mar 23, 2009 6:34AM in Database - RAC/Scalability (MOSC) 8 commentsAnswered
Recently, I moved a database from one cluster to another 2 node cluster with more CPU and memory. After the move, the CPU utilization on each node about under 20%. Slowly, I found that the CPU utilization kept going up on one instance. On checking the top CPU consuming sessions in grid control, I was surprised to find that no a single application user shows up in top 10. The top 4 CPU consuming processes are LMS0, LMS1, LMS2 and LMS3. On the second instance, I do see application user sessions among top 10. How can Oracle's internal processes consume so much CPU?
The OS/Oracle/HW: Windows 2003/Oracle 10.2.0.3/EM64T 16 CPUs per node, 64GB memory per node.

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