12c: Warning Message About Heavy Swapping Observation and ORA-700 [kskvmstatact: excessive swapping observed] (Doc ID 1919850.1)

Last updated on AUGUST 10, 2017

Applies to:

Oracle Database - Enterprise Edition - Version 12.1.0.1 to 12.2.0.1 [Release 12.1 to 12.2]
Information in this document applies to any platform.

Symptoms

Alert log reports frequent information about memory being swapped like below:

...
WARNING: Heavy swapping observed on system in last 5 mins.
pct of memory swapped in [2.70%] pct of memory swapped out [0.00%].
Please make sure there is no memory pressure and the SGA and PGA
are configured correctly. Look at DBRM trace file for more details.
Errors in file /orasw01/oracle/diag/rdbms/elfadev/ELFADEV/trace/ELFADEV_dbrm_21092.trc  (incident=16909):
ORA-00700: soft internal error, arguments: [kskvmstatact: excessive swapping observed], [], [], [], [], [], [], [], [], [], [], []
Incident details in: /orasw01/oracle/diag/rdbms/elfadev/ELFADEV/incident/incdir_16909/ELFADEV_dbrm_21092_i16909.trc
...


The sum of the pct memory swapped in and swapped out always appears to be higher that 2%.

The DBRM trace file shows information similar to:

Heavy swapping observed in last 5 mins:    [pct of total memory][bytes]
total swpin [ 3.60%][599496K], total swpout [ 0.00%][0K]
vm stats captured every 30 secs for last 5 mins:
swpin:                 swpout:  
[ 0.07%][     12416K]  [ 0.00%][         0K]
[ 0.38%][     63712K]  [ 0.00%][         0K]
[ 0.05%][      9432K]  [ 0.00%][         0K]
[ 0.81%][    135488K]  [ 0.00%][         0K]
[ 0.35%][     59032K]  [ 0.00%][         0K]
[ 0.22%][     37744K]  [ 0.00%][         0K]
[ 0.35%][     58544K]  [ 0.00%][         0K]
[ 0.62%][    104592K]  [ 0.00%][         0K]
[ 0.56%][     93368K]  [ 0.00%][         0K]
[ 0.15%][     25168K]  [ 0.00%][         0K]
Heavy swapping observed in last 5 mins:    [pct of total memory][bytes] 

 
The call stack trace is similar to

----- Call Stack Trace -----

... kskvmstatact kskdbrmtoutact ksbcti ksbabs ksbrdp opirip opidrv sou2o ...

 

Changes

 Upgraded to version 12.1.

Cause

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