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CLOSE_WAIT with the Pmon background

edited Jun 20, 2018 11:30AM in Database Networking (MOSC) 2 commentsAnswered

You can see a pmon process in a close wait.
You can simulate the case by disabling a storage cache and running some performance load on a database server.

[root@..... ~]# netstat -anp |grep CLOSE|grep ora
tcp        0      0 10.248.99.102:1522          10.248.99.4:43405           CLOSE_WAIT  9313/oraclexxxxx
tcp        1      0 10.248.99.102:1522          10.248.99.4:43404           CLOSE_WAIT  9313/oraclexxxxx
tcp        1      0 10.248.99.3:41966           10.248.99.3:47444           CLOSE_WAIT  26442/ora_pmon_xxxxx

Is there any explanation for this issue?how to avoid this from happening as the CLOSE_WAIT is a not normal state of the process, pmon is a critical background process that should handle CLOSE_WAIT situation using proper error handler mechanism and not to be stuck in this state?

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