Generally, SCCM auxiliary sites are installed in branches without IT administrators.
The following link explains how to install the SQL server. We know that the secondary site in sccm2012 also requires a database. For the secondary site, we can use the SQL Server Express version of data, this database will be automatically installed during the installation of the secondary site, that is, you do not have to install the SQL express database on the secondary site in advance.
Note:
(1): SCCM has certain requirements for SQL Server database sorting rules. Please ensure that CAS (central management site), primary site (primary site), and secondary site (secondary site) the sorting rules are consistent.
(2): The computer account of each site server in SCCM must have full control permissions on the system management container.
(3): Database Replication exists between CAS, primary site, primary site, and secondary site. Therefore, ports 1433 and 4022 must be enabled for All database servers in the firewall's inbound rules.
(4): For WMI and print file sharing services, ensure that the BIST service runs properly through the firewall.
TIPS: Check the prerequisites when installing the secondary site. We can use the trace tool to dynamically check which prerequisites are being checked.
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Port 4022 is used for inter-Site Database Replication
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Link: how to install 2012 secondary site
Http://microsoftteched.com/2012/04/24/how-to-install-sccm-2012-secondary-site/