Check soft limits for maximum open file descriptors

Oracle Preinstallation RPM only configures the limits. If you are implementing Oracle Grid Infrastructure job role separation, then copy the values from the oracle user to the grid user in the limits. Note: If you make changes to an Oracle installation user account and that user account is logged in, then changes to the limits. Hence a high value should be set for max-threads only after some experimentation. The number of allocated file descriptors cannot exceed the limit that the system can support.

To find out the current system limit for file descriptors, run the following command:. To find out how many of the available file descriptors are being currently used, run the following command:.

In this example, is the number of allocated file descriptors, 52 is the number of free allocated file descriptors, and is the maximum number of file descriptors that the system supports. In this example, is the number of file descriptors in use and the number of allocated file descriptors.

Note that in Solaris, there is no maximum open file descriptors setting. This method of setting the file descriptor limit is no longer recommended in Solaris 10 and Solaris The other advantage is that processes of other projects are not affected.

For changing the hard limit for project PRJ from the default to , use the following command:. For changing the soft limit for project PRJ from the default to , use the following command:. Our Elasticsearch process has a max file limit of , which is way less than we intended!

Welp, at least that explains why we're seeing all those errors in the log. For the record, it took us 79 Elasticsearch indices to hit the open file limit. Oh well, let's move on to actually fixing this. Sorry it took this long to get here! The ulimit -n command that's floating around, as every easy 'solution', will not actually fix your problem. The issue is that the command only raises your limit for the active shell session, so it's not permanent, and it most definitely will not affect your processes that are already running actually, nothing will, so don't have high expectations here.

The asterisk at the beginning of the first two lines means 'apply this rule to all users except root', and you can probably guess that the last two lines set the limit only for the root user. The number at the end is of course, the new limit you're setting. I never got around to looking into what exactly this does, but I'd assume that these two files control whether the limits file you edited above is actually read at the beginning of your sessions.

So, you did it, great job!