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>