Root users cannot switch to oracle users

Today, we found that the linux server in the company cannot pass the su command under the root user.

Today, we found that the company's linux server cannot switch to oracle users through su-oracle under the root user, So Baidu. The result is that too many files are opened. Considering that the kill process is too risky, you have to modify/etc/security/limits. conf vi/etc/security/limits. conf: * soft nofile 1024 * hard nofil

Today, we found that the company's linux server cannot switch to oracle users through su-oracle under the root user, So Baidu. The result is that too many files are opened. Considering that the kill process is too risky, you have to modify/etc/security/limits. conf.
Vi/etc/security/limits. conf

Set * soft nofile 1024

* Hard nofile 8192

Change

* Soft nofile 2048

* Hard nofile 8192
After the modification, use ulimit-Hn and ulimit-Sn to confirm that the modification has taken effect.

I tried again.

Su-oracle

Successful