Hi,
Thank you for posting in Symantec community.
You need .zip file to perform database restore, only with the help of sem5.db it's not possible.
You can perform a disaster recovery without a database backup, but the following points apply in this case:
1) All policies must be re-created, or imported from other backups i.e. exported policy files.
2) Clients will be able to communicate with the SEPM but will re-appear in the console only after their next check-in.
3) Clients will reappear in the default group as they check in, unless you enable automatic creation of client groups on the re-installed SEPM by editing "scm.agent.groupcreation=true" to the conf.properties file. This file is located <drive>Program files or(x86)/Symantec/Symantec Endpoint Protection Manager/tomcat/etc.
4) If you originally had multiple SEPM domains beyond the default domain, you must re-create them using domain IDs from Backup.txt.