DBFS Takes a long time to do a an ls (or stat) on a directory while other file activity is going on
Last updated on JUNE 15, 2012
Applies to:Oracle Server - Enterprise Edition - Version 220.127.116.11 and later
Oracle Exadata Hardware - Version 18.104.22.168 and later
Information in this document applies to any platform.
During a period when concurrent session are adding new files and an ls or 'stat' is taking place on the DBFS fie system you may see.
a. The DBFS file system gets unmounted
b. Very slow performance.
The unmounts are due to either
The value of the environment variable
PERL_ALARM_TIMEOUT being exceeded (default is 15)
If DBFS is controlled by a OCR resource the CHECK_INTERVAL is exceeded. (The default 30)
More information can be obtained by mounting the DBFS file system with these additional options.
-o trace_file=/tmp/dbfs_client.log -o trace_level=1 -o trace_size=500 /dbfs
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