It is the job of a DBA to ensure that the database is always available for application demands and client needs. Yet this is extremely difficult to accomplish without the necessary skills and experience with common operating-system and PostgreSQL tools. Installing, configuring, and optimizing a PostgreSQL cluster is but a tiny fraction of the process. We also need to know how to find and recognize problems, manage a swarm of logical and physical replicas, and scale to increasing demands, all while preventing or mitigating system outages.
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