Huge Number Of DBSNMP Sessions Impacting RAC Performance - Hundreds of Processes from pz99 to pz00, py99 to py00, etc.
Last updated on JANUARY 18, 2013
Applies to:Oracle Exadata Hardware - Version 188.8.131.52.1 and later
Information in this document applies to any platform.
You find there are a large number of DBSNMP sessions or processes found in your RAC database.
Performance may be degraded due to:
- Higher than normal bandwidth congestion for cluster-wide operations
- Total number of processes impacts user processes and throughput
- High memory consumption for non-user processes
- High CPU for non-user processes
- A closer inspection of the excessive processes determined
- They are identified as owned by DBSNMP
- The process names appear system generated starting with pz99 ; pz98 ... and count down to pz00
- Other processes may also show as py99 , py98 ... or even pw99 ...
The problem is unique to RAC databases.
The associated background processes are unique to multiple instance view queries (GV$).
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