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Chapter 22.
Setting Shell Limits for Your Oracle
User
Most shells like Bash provide control over various resources like the maximum allowable number of
open file descriptors or the maximum number of processes available to a user. For more information
on ulimit for Bash, see man bash and search for ulimit.
If you just install a small test database, then you might be fine with the current settings. Please note
that the limits very often vary from system to system. But for larger, production databases, you should
increase the following shell limits to the following values recommended by Oracle:
nofile = 65536
To verify the above command execute ulimit -n.
nproc
= 16384
To verify the above command execute ulimit -u.
The nofile option denotes the maximum number of open file descriptors, and nproc denotes the
maximum number of processes available to a single user.
To see all shell limits, execute:
ulimit -a
The following procedures and links show how to increase these parameters for the oracle user
account:
• For more information on nofile and how to increase the limit, see
Number of Open File Descriptors for the Oracle
• For information on nproc and how to increase the limit, see
Number of Processes Available for the Oracle
Section 11.1, "Limiting Maximum
User".
Section 11.2, "Limiting Maximum
User".
85
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