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Full Discussion: AIX change ulimit for a user
Top Forums UNIX for Advanced & Expert Users AIX change ulimit for a user Post 303042627 by cokedude on Wednesday 1st of January 2020 05:02:19 PM
Old 01-01-2020
Quote:
Originally Posted by vbe
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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POSIX_GETRLIMIT(3)							 1							POSIX_GETRLIMIT(3)

posix_getrlimit - Return info about system resource limits

SYNOPSIS
array posix_getrlimit (void ) DESCRIPTION
posix_getrlimit(3) returns an array of information about the current resource's soft and hard limits. Each resource has an associated soft and hard limit. The soft limit is the value that the kernel enforces for the corresponding resource. The hard limit acts as a ceiling for the soft limit. An unprivileged process may only set its soft limit to a value from 0 to the hard limit, and irreversibly lower its hard limit. RETURN VALUES
Returns an associative array of elements for each limit that is defined. Each limit has a soft and a hard limit. List of possible limits returned +-----------+---------------------------------------------------+ |Limit name | | | | | | | Limit description | | | | +-----------+---------------------------------------------------+ | core | | | | | | | The maximum size of the core file. When 0, not | | | core files are created. When core files are | | | larger than this size, they will be truncated at | | | this size. | | | | | totalmem | | | | | | | The maximum size of the memory of the process, | | | in bytes. | | | | |virtualmem | | | | | | | The maximum size of the virtual memory for the | | | process, in bytes. | | | | | data | | | | | | | The maximum size of the data segment for the | | | process, in bytes. | | | | | stack | | | | | | | The maximum size of the process stack, in bytes. | | | | | rss | | | | | | | The maximum number of virtual pages resident in | | | RAM | | | | | maxproc | | | | | | | The maximum number of processes that can be cre- | | | ated for the real user ID of the calling process. | | | | | memlock | | | | | | | The maximum number of bytes of memory that may | | | be locked into RAM. | | | | | cpu | | | | | | | The amount of time the process is allowed to use | | | the CPU. | | | | | filesize | | | | | | | The maximum size of the data segment for the | | | process, in bytes. | | | | |openfiles | | | | | | | One more than the maximum number of open file | | | descriptors. | | | | +-----------+---------------------------------------------------+ EXAMPLES
Example #1 Example use of posix_getrlimit(3) <?php $limits = posix_getrlimit(); print_r($limits); ?> The above example will output something similar to: Array ( [soft core] => 0 [hard core] => unlimited [soft data] => unlimited [hard data] => unlimited [soft stack] => 8388608 [hard stack] => unlimited [soft totalmem] => unlimited [hard totalmem] => unlimited [soft rss] => unlimited [hard rss] => unlimited [soft maxproc] => unlimited [hard maxproc] => unlimited [soft memlock] => unlimited [hard memlock] => unlimited [soft cpu] => unlimited [hard cpu] => unlimited [soft filesize] => unlimited [hard filesize] => unlimited [soft openfiles] => 1024 [hard openfiles] => 1024 ) NOTES
Note This is a not POSIX function, but is common on BSD and System V systems. If the system does not support this function, then it will not be included at compile time. This may be checked with function_exists(3). SEE ALSO
man page GETRLIMIT(2). PHP Documentation Group POSIX_GETRLIMIT(3)
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