A PostgreSQL instance

A Cluster is a single, complete, running, PostgreSQL server (IE: cluster of databases)

  • One PostgreSQL Server
  • Listening on one port (may be multiple addresses)
  • One set of data files (including tablespaces)
  • One set of Write Ahead Log

Operations done on a Cluster:

  • Initialization (initdb)
  • Start / Stop the cluster
  • File-level Backup / Restores
  • Streaming Replication

Objects defined at Cluster level

  • Users / Roles
  • Tablespaces
  • Databases

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