Must gave have relevant experience and in-depth knowledge in any PostgreSQL administration task.
A Database Administrator's Responsibilities Can Include The Following Tasks
Perform installations and upgrades of PostgreSQL (Preferably PPAS 9.4+)
Plan and perform DB Patching
Knowledge of Database backups / Troubleshoot failures, query execution plans, performance tuning techniques
Define maintenance plans
Configure / Troubleshoot Replication (BSR / xDB SMR / xDB MMR)
Set up disaster recovery
Perform Fail-over and Fail-back
ANY GRADUATE