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A Database Instance is made up of one or multiple dedicated compute nodes running a single database engine. Two node settings are available: **High-Availability (HA)**, with a main node and one replica, and **standalone** with a main node. The HA standby node is linked to the main node, using synchronous replication. Synchronous replication offers the ability to confirm that all changes intended by a transaction have been transferred and applied to the synchronous replica node, providing durability to the data.

**Note**: HA standby nodes are not accessible to users unless the main node becomes unavailable and the standby takes over. If you wish to run queries on a read-only node, you can use [Read Replicas](#path-read-replicas-create-a-read-replica)

Read Replicas can be used for certain read-only workflows such as Business Intelligence, or for a read-only scaling of your application. Read Replicas use asynchronous replication to replicate data from the main node.

USAGE:
  scw rdb instance <command>

AVAILABLE COMMANDS:
  clone             Clone a Database Instance
  connect           Connect to an instance using locally installed CLI
  create            Create a Database Instance
  delete            Delete a Database Instance
  get               Get a Database Instance
  get-certificate   Get the TLS certificate of a Database Instance
  get-metrics       [deprecated] Get Database Instance metrics
  list              List Database Instances
  renew-certificate Renew the TLS certificate of a Database Instance
  restart           Restart Database Instance
  update            Update an instance
  upgrade           Upgrade a Database Instance

WORKFLOW COMMANDS:
  wait              Wait for an instance to reach a stable state

FLAGS:
  -h, --help                help for instance
      --list-sub-commands   List all subcommands

GLOBAL FLAGS:
  -c, --config string    The path to the config file
  -D, --debug            Enable debug mode
  -o, --output string    Output format: json or human, see 'scw help output' for more info (default "human")
  -p, --profile string   The config profile to use

Use "scw rdb instance [command] --help" for more information about a command.
