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Should I enable seLinux, firewall after installation of oracle on linux?

First time to install oracle database standard edition on linux and have some issues not clear.

Q1: seLinux has to be disabled during installation, should I enable it after installation?

Q2: firewall has to be disabled during installation, I have to enabled it after installation due to the security requirements. We have the application server in DMZ, I only need to open the listener port for oracle database to be accessed by applications in DMZ, right?

Thanks you for your help.

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