77 lines
2.7 KiB
YAML
77 lines
2.7 KiB
YAML
# Pattern: Active Data Guard HA/DR
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# Composable architecture block for Oracle Database high availability
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pattern:
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name: "Active Data Guard"
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id: active_data_guard
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category: database-ha
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applies_to: [adb_s, adb_d, dbcs, exacs]
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description: |
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Oracle Active Data Guard provides real-time data protection with a standby database
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that can be used for read-only queries, reporting, and backups while maintaining
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synchronous or asynchronous replication from the primary.
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variants:
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- id: adg_same_region
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name: "Same-Region ADG (HA)"
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topology: "Primary + Standby in same region, different ADs or FDs"
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rpo: "0 (synchronous)"
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rto: "< 30 seconds (automatic failover with FSFO)"
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use_when:
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- "99.99% SLA requirement"
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- "Zero RPO mandatory"
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- "Read-only offload needed"
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- id: adg_cross_region
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name: "Cross-Region ADG (DR)"
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topology: "Primary in Region A, Standby in Region B"
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rpo: "> 0 (asynchronous, typically seconds to minutes)"
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rto: "Minutes to 1 hour depending on automation"
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use_when:
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- "Regional disaster recovery required"
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- "RPO of seconds acceptable"
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- "Regulatory requirement for geo-separation"
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- id: adg_hybrid
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name: "Same-Region HA + Cross-Region DR"
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topology: "Primary + Local Standby (sync) + Remote Standby (async)"
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rpo: "0 local, seconds remote"
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rto: "< 30s local, minutes remote"
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use_when:
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- "Maximum protection: HA + DR"
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- "Mission-critical workloads"
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preconditions:
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- "Oracle Database Enterprise Edition with Active Data Guard option"
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- "BYOL: customer must have ADG license or ULA"
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- "License Included: ADG included with ADB-S, ExaCS EE-HP/EE-EP"
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- "For ADB-S: Autonomous Data Guard (managed, no manual config)"
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implied_services:
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- service: data_guard
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- service: dns_traffic_management
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reason: "DNS failover for application connection string update"
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when: "cross_region"
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- service: oci_notifications
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reason: "Alert on failover events"
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conflicts:
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- pattern: "backup_restore_only"
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reason: "ADG provides real-time replication; backup-restore is a subset"
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cost_impact:
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- "Standby database incurs full compute + storage cost"
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- "For ADB-S: standby OCPUs billed at same rate"
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- "Cross-region: additional network egress for redo transport"
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- "BYOL: ADG license required (included in EE-EP)"
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sizing_rules:
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- "Standby must be same shape/OCPU as primary for failover"
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- "For read-only offload: standby can handle ~80% of primary read capacity"
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- "Network bandwidth for redo: estimate 10-50 Mbps per 10K TPS (varies by workload)"
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references:
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- "https://docs.oracle.com/en/cloud/paas/autonomous-database/adbsa/autonomous-data-guard.html"
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- "https://docs.oracle.com/en/database/oracle/oracle-database/19/sbydb/"
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