01-01-2020
Quote:
Greetings and Happy New Year!
You can't judge like that what is good/bad...
Oracle is no ordinary user: many users access to files using oracle UID the same for processes etc
So it will depend on the size of your RDBMS or how many instances you have running on a server, how many processes are "oracle" etc the same for files and file size: no ordinary user would produce a file on a system the size of a full export (oracle)...
Why unlimited as value is not a good idea unless you know what you are doing AND what the others do:
Just an example: if a coder badly checked his new code that went in production ( or just a bug...) fall on a case you case have files opening but not closed correctly, worse though quite funny when it occurs: executing an infinite loop opening new processes...
You end with a freeze of the system where if lucky and an admin can connect will shutdown gracefully the box, more severe no one can connect and you have no other choice but to power off...
AIX at least lets you define on a specific user basis, may not be the case of all Unixes you see
Addendum:
Q: Do you have any issues? Giving a lot of resources will give you peace ( no errors or warning of running out of resources...) only that waste of resource will affect performance, if that is OK with you and production are happy, well why worry except for the case you do have an issue, it will be in proportion with what you gave
This part makes sense. Some users know what they are doing and some don't.
Why unlimited as value is not a good idea unless you know what you are doing AND what the others do:
They said they were having trouble creating the files they need to create.
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ulimit(3) Library Functions Manual ulimit(3)
NAME
ulimit - Sets and gets process limits
LIBRARY
Standard C Library (libc.so, libc.a)
SYNOPSIS
#include <ulimit.h>
long int ulimit (
int command,
... );
STANDARDS
Interfaces documented on this reference page conform to industry standards as follows:
ulimit(): XSH4.2
Refer to the standards(5) reference page for more information about industry standards and associated tags.
PARAMETERS
Specifies the form of control. The command parameter can have the following values: Returns the soft file size limit of the process. The
limit is reported in 512-byte blocks (see the sys/param.h file) and is inherited by child processes. The function can read files of any
size.
The return value is the integer part of the soft file size limit divided by 512. If the result cannot be represented as a long int,
the result is unspecified. Sets the hard and soft process file size limit for output operations to the value of the second parame-
ter, taken as a long int value, and returns the new file size limit. Any process can decrease its own hard limit, but only a
process with superuser privileges can increase the limit.
The hard and soft file size limits are set to the specified value multiplied by 512. If the result would overflow an rlim_t, the
actual value set is unspecified. [Tru64 UNIX] Returns the maximum possible break value as described in the brk(2) reference page.
DESCRIPTION
The ulimit() function controls process limits.
During access to remote files, the process limits of the local node are used.
NOTES
The ulimit() function is implemented with calls to setrlimit(). The two interfaces should not be used in the same program. The result of
doing so is undefined.
RETURN VALUES
Upon successful completion, ulimit() returns the value of the requested limit and does not change the setting of errno. Otherwise, a value
of -1 is returned, and errno is set to indicate the error.
ERRORS
If the ulimit() function fails, the limit remains unchanged and errno is set to one of the following values: The command parameter is
invalid. A process without appropriate system privileges attempted to increase its file size limit.
As all return values are permissable in a successful situation, an application wishing to check for error situations should set errno to 0,
then call ulimit(), and, if it returns -1, check to see if errno is nonzero.
RELATED INFORMATION
Commands: ulimit(1)
Functions: brk(2), getrlimit(2), write(2)
Routines: pathconf(2)
Standards: standards(5)
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ulimit(3)