forked from diegoecab/oci-deal-accelerator
b30a4f0d32
The diagram path now follows a documented standard procedure (lookup the closest Oracle Architecture Center reference → confirm components → author absolute_layout → spec validator → render → visually verify) and ships persistent guardrails so layout regressions can't recur. Persistent procedure changes (apply to all users, all sessions): - tools/diagram_spec_validator.py — geometry checks (CONTAINER_TOO_THIN, CONTAINER_PADDING_VIOLATION, LABEL_OVERFLOW_PARENT) run BEFORE either renderer (drawio + PPTX). Catches the subnet-collapse / label-overflow bugs that the post-render drawio validator missed. - tools/oci_diagram_gen.py + tools/oci_pptx_diagram_gen.py — call the spec validator before emitting any output. Adds mysql / mysql_heatwave type aliases. - tools/archcenter_pattern_lookup.py — scores against cached page descriptions (not just the 1-line summary), supports --queries for multi-fragment composition, and applies synonym expansion via kb/architecture-center/synonyms.yaml so "LB HA cross AD" matches "load balancer high availability availability domain". - kb/architecture-center/synonyms.yaml — canonical synonym table (load balancer, autonomous database, data guard, …) used by the lookup scorer. KB enrichment: - tools/archcenter_description_fetcher.py + 121 cached _description.md under kb/diagram/assets/archcenter-refs/<slug>/. Removes the runtime dependency on docs.oracle.com when authoring specs and feeds the pattern-lookup scorer. - 110+ cached .drawio / .svg / .png references for offline reuse, plus the OCI Toolkit v24.2 import (kb/diagram/assets/oci-toolkit-drawio). Documentation: - docs/skill/output-formats.md — new "Standard diagram-generation procedure (MANDATORY)" + geometry rules + the new validator entry. - SKILL.md option 2 — references the mandatory procedure. - README.md — describes the spec validator, archcenter_pattern_lookup and description fetcher, and updates the KB-health table. Tooling that backs the procedure (cumulative across recent sessions): tools/archcenter_case_runner.py, archcenter_batch_driver.py, archcenter_zip_downloader.py, drawio_visual_validator.py, drawio_fidelity_eval.py, harvest_drawio_icon.py, import_oci_library.py, oci_pptx_diagram_gen.py, oci_pptx_render.py, refresh_pptx_icon_index.py. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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<a id="GUID-20F21093-AF9B-421D-A0B4-CA87155F6337" name="GUID-20F21093-AF9B-421D-A0B4-CA87155F6337"></a>
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<h2 id="INDAW-GUID-20F21093-AF9B-421D-A0B4-CA87155F6337" class="sect2">Learn About Disaster Recovery for
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Local and Regional Standbys</h2>
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<div class="ind">
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<div>
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<div>Ensuring business continuity is critical to success
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when designing applications. Achieving this requires a disaster recovery strategy that
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can rapidly restore service during disruptions.</div>For decades, organizations
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have relied on <span>Oracle Exadata Database Machine</span> and <span>Oracle Data Guard</span>, Oracle's premier disaster recovery technology, to support mission-critical applications,
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whether on-premises or within <span>Oracle Cloud
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Infrastructure</span> (OCI). <span>Oracle Exadata Database Service on Dedicated
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Infrastructure</span> on <span>Oracle Database@AWS</span> brings the same industry-leading performance, feature set, and price parity as Exadata on
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OCI. The hardware resides in AWS's data centers to provide low latency to AWS applications
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on top of unmatched high availability and disaster recovery capabilities, ensuring seamless
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operations during maintenance and in the event of disruption.
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<p>In this solution
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playbook, you learn how to implement disaster recovery with local and regional standbys
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on <span>Oracle Database@AWS</span>.
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</p>
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</div>
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<div class="sect2"><a id="GUID-E21BAD12-F5B8-43B6-B8EF-7FFB89BEFD64" name="GUID-E21BAD12-F5B8-43B6-B8EF-7FFB89BEFD64"></a><h3 id="INDAW-GUID-E21BAD12-F5B8-43B6-B8EF-7FFB89BEFD64" class="sect3">Before You Begin</h3>
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<div>
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<div>
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<div>Before you begin, ensure the following:</div>
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<ul style="list-style-type: disc;" id="UL_T2P_QTV_5GC">
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<li>The Exadata infrastructure and the Exadata VM clusters are deployed in the standby
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availability zone and region.</li>
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<li>The network IP CIDR ranges for the primary and standby Exadata VM clusters don't
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overlap.</li>
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</ul>
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</div>
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<p>Review the following solutions:</p>
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<ul style="list-style-type: disc;" id="GUID-E21BAD12-F5B8-43B6-B8EF-7FFB89BEFD64__UL_PW4_CKT_TGC">
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<li><a href="https://docs.oracle.com/en/solutions/implement-dr-cross-region-dg-odb-aws/index.html" target="_blank"><span><cite>Implement disaster recovery with
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cross-regional Data Guard on Oracle Database@AWS</cite></span></a></li>
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<li id="GUID-E21BAD12-F5B8-43B6-B8EF-7FFB89BEFD64__LI_GHW_M25_TGC"><a href="https://docs.oracle.com/en/solutions/cross-zone-dr-db-at-aws/index.html" target="_blank"><span><cite>Implement disaster recovery with cross-zonal Data Guard on Oracle Database@AWS</cite></span></a></li>
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<li><a href="/pls/topic/lookup?ctx=en/solutions/dr-local-regional-standby-db-at-aws&id=exadata-oci-ovu" target="_blank"><span>Oracle Exadata Database Service on Dedicated
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Infrastructure</span></a></li>
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<li><a href="/pls/topic/lookup?ctx=en/solutions/dr-local-regional-standby-db-at-aws&id=DODJW" target="_blank"><span><cite>Deploy Oracle
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Database@AWS</cite></span></a></li>
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</ul>
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<p>Review these related resources:</p>
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<ul style="list-style-type: disc;" id="GUID-E21BAD12-F5B8-43B6-B8EF-7FFB89BEFD64__UL_DKR_225_TGC">
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<li>Review the <a href="/pls/topic/lookup?ctx=en/solutions/dr-local-regional-standby-db-at-aws&id=aws-networking-best-practices" target="_blank">Security best practices for your VPC</a> in <span>Amazon virtual private cloud</span> documentation
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</li>
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<li>Plan for AWS IP address space using <a href="/pls/topic/lookup?ctx=en/solutions/dr-local-regional-standby-db-at-aws&id=ohc-oci-odb-network-design" target="_blank">ODB Network Design</a></li>
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</ul>
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</div>
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</div>
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<div class="sect2"><a id="GUID-BF1C9332-AF53-4720-AEAC-9F7B696F5907" name="GUID-BF1C9332-AF53-4720-AEAC-9F7B696F5907"></a><h3 id="INDAW-GUID-BF1C9332-AF53-4720-AEAC-9F7B696F5907" class="sect3">Architecture</h3>
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<div>
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<div>
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<div>This architecture shows <span>Oracle Exadata Database
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Service</span> on <span>Oracle Database@AWS</span> in a disaster recovery topology using two standby databases:
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</div>
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<ul style="list-style-type: disc;" id="UL_GCL_QDB_5GC">
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<li>A local standby in the same region as the primary but in a different availability
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zone.</li>
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<li>A remote standby in a different region.</li>
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</ul>
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</div><br><div class="imageleft"><img class="imageleft" id="GUID-BF1C9332-AF53-4720-AEAC-9F7B696F5907__IMAGE_B3P_ZYT_TGC" height="811" width="1584" src="img/exadb-dbaws-dr-arch.png" alt="Description of exadb-dbaws-dr-arch.png follows" title="Description of exadb-dbaws-dr-arch.png follows" longdesc="img_text/exadb-dbaws-dr-arch.html"><br><a href="img_text/exadb-dbaws-dr-arch.html">Description of the illustration exadb-dbaws-dr-arch.png</a></div><br><p><a href="img/exadb-dbaws-dr-arch-oracle.zip" class="de-download">exadb-dbaws-dr-arch-oracle.zip</a></p>
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<p>Oracle Database runs in an Exadata VM cluster in the primary <code class="codeph">Region
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1</code>. For data protection and disaster recovery, <span>Active Data Guard</span> replicates the data to the following two Exadata VM clusters:
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</p>
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<ul style="list-style-type: disc;" id="GUID-BF1C9332-AF53-4720-AEAC-9F7B696F5907__UL_Y4P_TDB_5GC">
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<li>One in the same region but in a different availability zone (local
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standby). A local standby is ideal for failover scenarios, offering zero data loss
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for local failures while applications continue to operate without the performance
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overhead of communicating with a remote region.</li>
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<li>A second standby in a different region (remote standby). A remote
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standby is typically used for disaster recovery or to offload read-only
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workloads.</li>
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</ul>
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<p>Although <span>Active Data Guard</span> network traffic can traverse the AWS backbone, Oracle recommends this architecture
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which routes it over OCI for optimized throughput and latency.
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</p>
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<p>The <span>Oracle Exadata Database
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Service</span> on <span>Oracle Database@AWS</span> network is connected to the Exadata client subnet using a Dynamic Routing Gateway
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(DRG) managed by Oracle. A DRG is also required to create a peer connection between VCNs
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in different regions. Because only one DRG is allowed per VCN in OCI, a second VCN with
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its own DRG is required to connect the primary and standby VCNs in each region.
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</p>
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<ul style="list-style-type: disc;">
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<li>The primary Exadata VM cluster is deployed in <code class="codeph">Region
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1</code>, <code class="codeph">availability zone 1</code> in <code class="codeph">VCN1</code> with CIDR
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<code class="codeph">10.10.0.0/16</code> and client subnet CIDR
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<code class="codeph">10.10.1.0/24</code>.
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</li>
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<li><code class="codeph">VCN1</code> has Local Peering Gateways (LPGs) <code class="codeph">LPG1
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remote</code> and <code class="codeph">LPG1 local</code>.
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||
</li>
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<li>The Hub VCN in the primary <code class="codeph">Region 1</code> is <code class="codeph">Hub
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VCN1</code> with CIDR <code class="codeph">10.11.0.0/16</code>.
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</li>
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<li>The first standby Exadata VM Cluster is deployed in <code class="codeph">Region
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1</code>, <code class="codeph">availability zone 2</code> in <code class="codeph">VCN2</code> with
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CIDR <code class="codeph">10.20.0.0/16</code> and client subnet CIDR
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<code class="codeph">10.20.1.0/24</code>.
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</li>
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<li><code class="codeph">VCN2</code> has two LPGs <code class="codeph">LPG2 remote</code> and
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<code class="codeph">LPG2 local</code>.
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</li>
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<li>The Hub VCN is the same as the Hub VCN for the Primary database,
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<code class="codeph">Hub VCN1</code> as it resides in the same region.
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</li>
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<li><code class="codeph">Hub VCN1</code> has LPG <code class="codeph">Hub LPG1</code> and
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<code class="codeph">Hub LPG2</code> and <code class="codeph">DRG1</code>.
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</li>
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<li>The second standby Exadata VM cluster is deployed in <code class="codeph">Region
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2</code> in <code class="codeph">VCN3</code> with CIDR <code class="codeph">10.30.0.0/16</code> and
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client subnet CIDR <code class="codeph">10.30.1.0/24</code>.
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||
</li>
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<li><code class="codeph">VCN3</code> has a LPG <code class="codeph">LPG3 remote</code>.
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</li>
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<li>The Hub VCN in the remote standby <code class="codeph">Region 2</code> is
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<code class="codeph">Hub VCN3</code> with CIDR <code class="codeph">10.33.0.0/16</code>.
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</li>
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<li><code class="codeph">Hub VCN3</code> has a LPG <code class="codeph">Hub LPG3</code> and DRG
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<code class="codeph">DRG3</code>.
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||
</li>
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<li>No subnet is required for the hub VCNs to enable transit routing.
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Therefore, these VCNs can use very small IP CIDR ranges.</li>
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</ul>
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<p> This architecture supports the following components:</p>
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<ul style="list-style-type: disc;" id="GUID-BF1C9332-AF53-4720-AEAC-9F7B696F5907__UL_BKZ_BZT_TGC">
|
||
<li><span class="bold">AWS region</span><p id="GUID-BF1C9332-AF53-4720-AEAC-9F7B696F5907__d5e131">AWS regions
|
||
are separate geographic areas. They consist of multiple,
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||
physically separated, and isolated availability zones that
|
||
are connected with low latency, high throughput, highly
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||
redundant networking.</p>
|
||
</li>
|
||
<li><span class="bold">AWS availability zone</span><p id="GUID-BF1C9332-AF53-4720-AEAC-9F7B696F5907__d5e107">Availability
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||
zones are highly available data centers within each AWS
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||
region.</p>
|
||
</li>
|
||
<li><span class="bold">OCI virtual cloud
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||
network and subnet</span><p id="GUID-BF1C9332-AF53-4720-AEAC-9F7B696F5907__d720e1349">A virtual cloud
|
||
network (VCN) is a customizable, software-defined
|
||
network that you set up in an OCI region. Like
|
||
traditional data center networks, VCNs give you
|
||
control over your network environment. A VCN can
|
||
have multiple non-overlapping classless
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||
inter-domain routing (CIDR) blocks that you can
|
||
change after you create the VCN. You can segment a
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VCN into subnets, which can be scoped to a region
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||
or to an availability domain. Each subnet consists
|
||
of a contiguous range of addresses that don't
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overlap with the other subnets in the VCN. You can
|
||
change the size of a subnet after creation. A
|
||
subnet can be public or private. </p>
|
||
</li>
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||
<li><span class="bold">Route table</span><p id="GUID-BF1C9332-AF53-4720-AEAC-9F7B696F5907__d720e1237">Virtual
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||
route tables contain rules to route traffic from
|
||
subnets to destinations outside a VCN, typically
|
||
through gateways.</p>
|
||
</li>
|
||
<li><span class="bold">Network security group
|
||
(NSG)</span><p id="GUID-BF1C9332-AF53-4720-AEAC-9F7B696F5907__d720e1125">NSGs act as virtual firewalls for your cloud resources. With the zero-trust security model of OCI you control the network traffic inside a VCN. An NSG consists of a set of ingress and egress security rules that apply to only a specified set of virtual network interface cards (VNICs) in a single VCN.</p>
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||
</li>
|
||
<li><span class="bold">Local
|
||
peering</span><p id="GUID-BF1C9332-AF53-4720-AEAC-9F7B696F5907__d720e1054">Local peering allows two VCNs
|
||
within the same OCI region to communicate directly
|
||
using private IP addresses. This communication
|
||
does not traverse the internet or your on-premises
|
||
network. Local peering is enabled by a Local
|
||
Peering Gateway (LPG), which serves as the
|
||
connection point between VCNs. Configure an LPG in
|
||
each VCN and establish a peering relationship to
|
||
allow instances, load balancers, and other
|
||
resources in one VCN to securely access resources
|
||
in another VCN within the same region.</p>
|
||
</li>
|
||
<li><span class="bold">Dynamic routing gateway
|
||
(DRG)</span><p id="GUID-BF1C9332-AF53-4720-AEAC-9F7B696F5907__d720e701">The DRG is a
|
||
virtual router that provides a path for private
|
||
network traffic between VCNs in the same region,
|
||
between a VCN and a network outside the region,
|
||
such as a VCN in another OCI region, an
|
||
on-premises network, or a network in another cloud
|
||
provider.</p>
|
||
</li>
|
||
<li><span class="bold">Remote
|
||
peering</span><p id="GUID-BF1C9332-AF53-4720-AEAC-9F7B696F5907__d720e1231">Remote
|
||
peering enables private communication between
|
||
resources in different VCNs, which can be located
|
||
in the same or different OCI regions. Each VCN
|
||
uses its own Dynamic Routing Gateway (DRG) for
|
||
remote peering. The DRGs securely route traffic
|
||
between the VCNs over OCI's private backbone,
|
||
allowing resources to communicate using private IP
|
||
addresses without routing traffic over the
|
||
internet or through on-premises networks. Remote
|
||
peering removes the need for internet gateways or
|
||
public IP addresses for instances that need to
|
||
connect across regions.</p>
|
||
</li>
|
||
<li><span class="bold"><span>Oracle Exadata Database Service on Dedicated
|
||
Infrastructure</span></span><p id="GUID-BF1C9332-AF53-4720-AEAC-9F7B696F5907__d720e751"><span>Oracle Exadata Database Service on Dedicated
|
||
Infrastructure</span> enables you to leverage the power of Exadata in the cloud. <span>Oracle Exadata Database
|
||
Service</span> delivers proven <span>Oracle Database</span> capabilities on purpose-built, optimized Oracle Exadata infrastructure in the public cloud. Built-in cloud automation, elastic resource scaling, security, and fast performance for all <span>Oracle Database</span> workloads helps you simplify management and reduce costs.
|
||
</p>
|
||
</li>
|
||
<li><span class="bold"><span>Oracle Data Guard</span></span><p id="GUID-BF1C9332-AF53-4720-AEAC-9F7B696F5907__d720e390"><span>Oracle Data Guard</span> and <span>Active Data Guard</span> provide a comprehensive set of services that
|
||
create, maintain, manage, and monitor one or more
|
||
standby databases and that enable production
|
||
Oracle databases to remain available without
|
||
interruption. <span>Oracle Data Guard</span> maintains these standby databases as copies of
|
||
the production database by using in-memory
|
||
replication. If the production database becomes
|
||
unavailable due to a planned or an unplanned
|
||
outage, <span>Oracle Data Guard</span> can switch any standby database to the
|
||
production role, minimizing the downtime
|
||
associated with the outage. Oracle Active Data
|
||
Guard provides the additional ability to offload
|
||
read-mostly workloads to standby databases and
|
||
also provides advanced data protection
|
||
features.
|
||
</p>
|
||
</li>
|
||
</ul>
|
||
</div>
|
||
</div>
|
||
<div class="sect2"><a id="GUID-62AC9002-E108-4710-BED4-5337C48AB59E" name="GUID-62AC9002-E108-4710-BED4-5337C48AB59E"></a><h3 id="INDAW-GUID-62AC9002-E108-4710-BED4-5337C48AB59E" class="sect3">Recommendations</h3>
|
||
<div>
|
||
<div><span>Use the following recommendations as a starting point
|
||
when performing disaster recovery for <span>Oracle Exadata Database
|
||
Service</span> on <span>Oracle Database@AWS</span>. </span>Your requirements might differ from the architecture described here.
|
||
</div>
|
||
<ul style="list-style-type: disc;" id="GUID-62AC9002-E108-4710-BED4-5337C48AB59E__UL_V21_5R5_TGC">
|
||
<li>Use <span>Active Data Guard</span> for comprehensive data corruption prevention with automatic block repair, online
|
||
upgrades and migrations, and to offload the workload to standby with read-mostly
|
||
scale-out.
|
||
</li>
|
||
<li>Enable <span>Application Continuity</span> to mask database outages during planned and unplanned events from end-users.
|
||
</li>
|
||
<li>Configure automatic backups to <span>Oracle Database Autonomous
|
||
Recovery Service</span> in OCI. Although data is protected by <span>Oracle Data Guard</span>, minimize the backup workload on the database by implementing the
|
||
<code>incremental-forever</code> backup strategy that eliminates weekly
|
||
full backups. Alternatively, use <span>Amazon Simple Storage Service</span> for automatic backups.
|
||
</li>
|
||
<li>Run backups from standby to achieve cross-region backup
|
||
replication.</li>
|
||
<li>Use OCI <span>Full Stack DR</span> to orchestrate database switchover and failover operations.
|
||
</li>
|
||
<li>Store the database's <span>Transparent Data Encryption (TDE)</span> keys in <span>OCI Vault</span> with customer-managed keys.
|
||
</li>
|
||
</ul>
|
||
</div>
|
||
</div>
|
||
<div class="sect2"><a id="GUID-9CD49229-46A0-4F68-8EB8-E00D3C8B77EF" name="GUID-9CD49229-46A0-4F68-8EB8-E00D3C8B77EF"></a><h3 id="INDAW-GUID-9CD49229-46A0-4F68-8EB8-E00D3C8B77EF" class="sect3">Considerations</h3>
|
||
<div>
|
||
<p>When performing local and regional disaster recovery for <span>Oracle Exadata Database
|
||
Service</span> on <span>Oracle Database@AWS</span>, consider the following:
|
||
</p>
|
||
<ul style="list-style-type: disc;" id="GUID-9CD49229-46A0-4F68-8EB8-E00D3C8B77EF__UL_YQL_DQ5_TGC">
|
||
<li>When Exadata VM clusters are created in the <span>Oracle Database@AWS</span> child site, each Exadata VM cluster is provisioned in its own OCI VCN. Peer the
|
||
VCNs and avoid overlapping CIDRs and ensure that the databases communicate with each
|
||
other so that <span>Data Guard</span> can ship <code>redo</code> data.
|
||
</li>
|
||
<li>Cross‑region latency is typically too high for synchronous transport in
|
||
mission-critical applications. Hence, use <span>Data Guard</span>
|
||
<code>ASYNC</code> replication across regions. Add <span>Active Data Guard Far Sync</span> to ensure zero data loss across regions.
|
||
</li>
|
||
<li>Configure OCI as the preferred network for better performance, lower latency, higher
|
||
throughput, and reduced cost; the first 10 TB/month of data egress is free across
|
||
regions.</li>
|
||
<li>You can create up to six standby databases per primary using cloud tooling.</li>
|
||
</ul>
|
||
</div>
|
||
</div>
|
||
<div class="sect2"><a id="GUID-BBA68F23-5B6E-4CC5-A7CE-2C525BFCF72E" name="GUID-BBA68F23-5B6E-4CC5-A7CE-2C525BFCF72E"></a><h3 id="INDAW-GUID-BBA68F23-5B6E-4CC5-A7CE-2C525BFCF72E" class="sect3">About Required Services and
|
||
Roles</h3>
|
||
<div>
|
||
<p>This solution requires the following services and roles:</p>
|
||
<ul style="list-style-type: disc;">
|
||
<li><span>Oracle Cloud Infrastructure
|
||
Networking</span></li>
|
||
<li><span>Oracle Exadata Database
|
||
Service</span></li>
|
||
</ul>
|
||
<p>These are the roles needed for each service.</p>
|
||
<div class="tblformal" id="GUID-BBA68F23-5B6E-4CC5-A7CE-2C525BFCF72E__GUID-7CE17383-3146-4560-A5FE-8D1E5CC7CA95">
|
||
<table cellpadding="4" cellspacing="0" class="Formal" title summary="Lists services and roles for this solution" frame="hsides" border="1" rules="rows">
|
||
<thead>
|
||
<tr align="left" valign="top">
|
||
<th align="left" valign="bottom" width="20%" id="d297e531">Service Name: Role</th>
|
||
<th align="left" valign="bottom" width="20%" id="d297e533">Required to...</th>
|
||
</tr>
|
||
</thead>
|
||
<tbody>
|
||
<tr align="left" valign="top">
|
||
<td align="left" valign="top" width="20%" id="d297e537" headers="d297e531 "><span>Oracle Exadata Database
|
||
Service</span>: <code class="codeph">manage database-family</code></td>
|
||
<td align="left" valign="top" width="20%" headers="d297e537 d297e533 ">Manage the database, including adding and operating Active Data Guard deployments </td>
|
||
</tr>
|
||
<tr align="left" valign="top">
|
||
<td align="left" valign="top" width="20%" id="d297e546" headers="d297e531 "><span>OCI Networking</span>: <code class="codeph">manage vcn-family </code></td>
|
||
<td align="left" valign="top" width="20%" headers="d297e546 d297e533 ">Manage the network components, including VCNs, subnets, security rules, and VCN
|
||
peering</td>
|
||
</tr>
|
||
</tbody>
|
||
</table>
|
||
</div>
|
||
<p>See <a href="/pls/topic/lookup?ctx=en/solutions/dr-local-regional-standby-db-at-aws&id=oracle-products-and-services" target="_blank">Oracle Products, Solutions, and Services</a> to
|
||
get what you need.
|
||
</p>
|
||
</div>
|
||
</div>
|
||
</div>
|
||
</article>
|
||
<div id="disclaimers" class="legal">
|
||
<div><a href="#copyright-information" role="button" data-toggle="collapse" aria-expanded="false" class="collapsed" aria-controls="copyright-information" id="copyright-information-btn">Title and Copyright Information</a></div>
|
||
<div class="collapse" id="copyright-information" aria-expanded="false">
|
||
<p class="legal">Implement disaster recovery with local and regional standbys on Oracle Database@AWS</p>
|
||
<p class="legal">G43628-02</p>
|
||
<p class="date legal">October 2025</p>
|
||
<div class="legal" style="display:inline"><a href="/pls/topic/lookup?ctx=en/legal&id=cpyr" target="_blank">Copyright ©</a>2025, </div><div class="legal" style="display:inline">Oracle and/or its affiliates.</div>
|
||
</div>
|
||
</div>
|
||
</body>
|
||
</html> |