SMON timer and RDBMS ips message uses more memory

Oracle 11g2.01 on Redhat 5.2. We do a big data conversion operation. After 48 hours, the operating rate became 1/5 of that when the operation was just started. I checked with the utility of Linux top and know that some process oracle used almost 70% of the memory. I then check what is the preocesses are like
select PROCESS,osuser,event,wait_class,sid,serial#
  from v$session where PROCESS in ('17760','17758','20075') order by process;

PROCESS                     OSUSER                      EVENT                       WAIT_CLASS                  SID                         SERIAL#                     
17758                       oracle                      rdbms ipc message           Idle                        120                         1                           
17760                       oracle                      smon timer                  Idle                        239                         1                           
20075                       oracle                      rdbms ipc message           Idle                        133                         3                           
These processes use 0 CPU, but the memory of many. They stay there for quite some time now.

What do these processes, and if I can kill these processes?

Compare with yours, I have much more WSPD. What do you think?

I do not think that the static value of swpd = 98556 & no real activity reported SwapIn (is) or SwapOut (so), no indication any permutation that happens.
RAM is NOT the bottleneck & cause any delay of major response time.

Tags: Database

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