Huge Number Of DBSNMP Sessions Impacting RAC Performance - Hundreds of Processes from pz99 to pz00, py99 to py00, etc.

(Doc ID 1515385.1)

Last updated on JANUARY 18, 2013

Applies to:

Oracle Exadata Hardware - Version 11.2.1.2.1 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 ...

None required.

The problem is unique to RAC databases.

The associated background processes are unique to multiple instance view queries (GV$).

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