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If there is a failure, as described in Failure scenarios, the DR frontend is used as an active frontend. Load the latest masterdb.sql file into the DR master database (either as apg or root user):
DR-PBE-HOST# ~/Databases/MySQL/Default/bin/mysql -uapg -pwatch4net -S /opt/APG/Databases/MySQL/Default/data/mysql.sock master < /opt/APG/masterdb.sql
After the latest master database from the PROD site is loaded, all database tables will have the same content as on PROD site. Additional steps must be taken to update resources table of the master database with the DR site backend/database servers (as explained in Failure scenarios).