---
last_verified: 2026-03-14
description: Reference layout for database HA/DR architecture diagram
---

layout:
  name: "Database HA/DR — Dual Region"
  page_size: "A3 landscape"

  structure:
    # Primary region takes 60% of width
    primary_region:
      position: { x: 20, y: 40 }
      size: { width: 680, height: 720 }
      contains:
        vcn:
          position: { x: 20, y: 40 }
          size: { width: 640, height: 660 }
          subnets:
            data_tier:
              position: { x: 20, y: 30 }
              size: { width: 300, height: 400 }
              label_position: "top-left"
            app_tier:
              position: { x: 340, y: 30 }
              size: { width: 280, height: 200 }
            dmz:
              position: { x: 340, y: 250 }
              size: { width: 280, height: 100 }

    # DR region takes 35% of width
    dr_region:
      position: { x: 720, y: 40 }
      size: { width: 460, height: 720 }
      contains:
        vcn:
          position: { x: 20, y: 40 }
          size: { width: 420, height: 400 }
          subnets:
            dr_data_tier:
              position: { x: 20, y: 30 }
              size: { width: 380, height: 350 }

    # Connection between regions (horizontal)
    inter_region_connection:
      from: "data_tier"
      to: "dr_data_tier"
      style: "adg"
      label_position: "center"

  notes:
    - "Primary region on left, DR region on right"
    - "Data Guard arrow flows left → right"
    - "FastConnect shown at bottom connecting to on-premises"
    - "Security services (Vault, Data Safe) placed near data tier"