Poor OHS Performance on Shared Filesystems ( NAS / NFS ) Due to Creation of dms_metrics.lock and dms_metrics_[pid].shm.mem files

(Doc ID 400591.1)

Last updated on NOVEMBER 30, 2017

Applies to:

Oracle Fusion Middleware - Version 10.1.2.0.0 to 11.1.1.7.0 [Release AS10gR2 to Oracle11g]
Oracle HTTP Server - Version 10.1.2.0.0 to 11.1.1.7.0 [Release AS10gR2 to Oracle11g]
Information in this document applies to any platform.
- This does not apply to 11.1.1.9 and later

Symptoms

In Application Server 10.1.2/10.1.3 some new temporary files are created when the HTTP server is running. These files are created by DMS and they are stored by default in $ORACLE_HOME/Apache/Apache/logs. There is no directive to move the dms_metrics.lock file or dms_metrics_xyz.shm files to a different directory in the same way you can do with the httpd.lock file with the LockFile directive in httpd.conf.

There is a need of moving dms_metrics.lock to a local filesystem in the same way as httpd.lock when running the Oracle HTTP_Server on a NFS filesystem, otherwise the HTTP Server performance is poor. This issue began with 10g releases, but has also evolved through 11g and 12c with different issues and solutions. This document provides advice for this situation.

 

Cause

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