PostgreSQL is most advanced open source database. A vibrent community is developing and supporing it. The development community have industry leading experts e.g. Bruce Momjian.
Amazon AWS cloud is also offer it to their client. AWS has branded it as AWS RDS PostgreSQL.
A DBA should understand database architecture and its components. He should be able to design database solutions including backup and recovery. Apart from that, a expert dba should also be able tune database as and when required.
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