88 lines
3.0 KiB
YAML
88 lines
3.0 KiB
YAML
---
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last_verified: 2026-03-14
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pattern: Database High Availability
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category: database
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---
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description: |
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Patterns for achieving high availability for Oracle databases on OCI.
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Covers ADB-S, ADB-D, ExaCS, and DBCS configurations.
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patterns:
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adb_s_ha:
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name: "ADB-S Built-in HA"
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availability: "99.95% SLA"
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rto: "<30 seconds"
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rpo: "0 (synchronous)"
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components:
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- "ADB-S with Autonomous Data Guard (same-region)"
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- "Automatic failover enabled"
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- "No additional configuration needed"
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cost_impact: "2x OCPU cost (standby billed at same rate)"
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when_to_use:
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- "Standard HA requirement"
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- "Same-region protection sufficient"
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notes:
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- "Standby is provisioned automatically when ADG is enabled"
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- "Failover is transparent to applications using recommended connection strings"
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- "Switchover for planned maintenance is automatic"
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adb_s_cross_region:
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name: "ADB-S Cross-Region ADG"
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availability: "99.95% SLA per region, survives region failure"
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rto: "<5 minutes (automatic), <30 minutes (manual)"
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rpo: "Seconds (asynchronous replication)"
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components:
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- "ADB-S primary in Region 1"
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- "ADB-S standby in Region 2 (cross-region ADG)"
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- "Optional: Refreshable clone in Region 2 for reporting"
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cost_impact: "2x OCPU + inter-region data transfer"
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when_to_use:
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- "Compliance requires geo-redundant DR"
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- "RTO < 30 minutes for region failure"
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- "Business-critical workloads"
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notes:
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- "Cross-region ADG is asynchronous — RPO is not zero"
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- "Automatic failover requires ADG Auto-Failover configuration"
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- "Test failover quarterly"
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exacs_rac_ha:
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name: "ExaCS RAC High Availability"
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availability: "99.95%+ (RAC + Data Guard)"
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rto: "<60 seconds (RAC failover)"
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rpo: "0 (synchronous within RAC)"
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components:
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- "ExaCS with multi-node RAC"
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- "Data Guard to standby ExaCS (same or cross-region)"
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- "Fast-Start Failover (FSFO) with Observer"
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cost_impact: "2x infrastructure for Data Guard standby"
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when_to_use:
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- "Application requires RAC"
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- "Sub-minute RTO required"
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- "High-throughput OLTP workloads"
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dbcs_ha:
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name: "DBCS 2-Node RAC + Data Guard"
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availability: "99.95%"
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rto: "<60 seconds (RAC), <5 minutes (Data Guard)"
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rpo: "0 (synchronous within region)"
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components:
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- "DBCS 2-node RAC (primary)"
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- "DBCS Data Guard standby"
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cost_impact: "3x compute (2 RAC + 1 DG standby)"
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when_to_use:
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- "Moderate workloads needing HA"
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- "Budget doesn't allow Exadata"
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decision_tree: |
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Need HA for Oracle Database?
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├── Using ADB-S?
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│ ├── Same-region sufficient → Enable ADG (built-in)
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│ └── Cross-region required → Cross-region ADG
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├── Using ExaCS?
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│ ├── RAC for local HA
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│ └── Data Guard for DR (same or cross-region)
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└── Using DBCS?
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├── 2-node RAC for local HA
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└── Data Guard for DR
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