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Database Processes Towards NAS Disk (Oracle Direct NFS) Creating Many CLOSE_WAIT (Doc ID 1556143.1)

Last updated on DECEMBER 27, 2019

Applies to:

Oracle Database - Enterprise Edition - Version 11.2.0.1 and later
Oracle Database Cloud Schema Service - Version N/A and later
Oracle Database Exadata Express Cloud Service - Version N/A and later
Oracle Database Exadata Cloud Machine - Version N/A and later
Oracle Cloud Infrastructure - Database Service - Version N/A and later
Information in this document applies to any platform.

Symptoms

#netstat -anp|grep CLOSE_WAIT|wc -l

Above command shows output

 "Foreign Address" is the EMC NAS
 "Local Address" is the servers NIC interface on that subnetwork.
And Process is various RDBMS processes such as dbrm, gen0, q000, mmon, arc2, reco, smon, emnc  etc etc AS well as client connections (LOCAL=NO)

From the beginning all CLOSE_WAITs where of 2 kinds:
1. Cloud Control Agent java process
2. Database processes towards NAS disk (Oracle Direct NFS)

 

Cause

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In this Document
Symptoms
Cause
Solution
 This behaviour is expected, and doesn't affect application/system performance or other I/O throughput in any way. 
References


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