有现场反馈plsql无法连接数据库了，登录环境查看时发现从root切换到grid时报错/bin/bash: Resource temporarily unavailable
root@db1 \~\]# su - grid Last login: Thu Jul 27 18:45:04 CST 2023 su: failed to execute /bin/bash: Resource temporarily unavailable 使用root用户查看grid用户的nproc和nofile较小，当前连接数2000多 \[root@db1 \~\]# grep grid /etc/security/limits.conf grid soft nproc 2047 grid hard nproc 32768 grid soft nofile 1024 grid hard nofile 250000 grid soft stack 10240 grid hard stack 32768  \[root@db1 \~\]# ps -ef \|grep LOCAL=NO\|wc -l 2038 处理办法，调整/etc/security/limits.conf文件的grid用户参数，修改后如图： \[root@db1 \~\]# grep grid /etc/security/limits.conf grid soft nproc 20470 grid hard nproc 32768 grid soft nofile 10240 grid hard nofile 250000 grid soft stack 10240 grid hard stack 32768 \[root@db1 \~\]#  配置后，再次从root用户切换到grid，登录正常 \[root@db1 \~\]# su - grid Last login: Thu Jul 27 18:35:04 CST 2023 grid@db1\>