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 AUGUST 07, 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

Note: If you are configuring OHS bundled as part of an E-Business Suite implementation follow the <note 787116.1> instead of this one. This note covers OHS 10g / 11g environments not bundled with E-Business Suite.

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 not a  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 HTTP_Server on a NFS filesystem, otherwise the HTTP Server performance is poor.

Changes

The problem affect 10.1.2, 10.1.3 and 11g Application Server installations on non-local filesystems (e.g. NFS)

Cause

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