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Diagram generation: ref-arch-driven procedure + spec validator + KB enrichment

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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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2026-04-25 21:15:21 -03:00
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# Deploy Oracle Database@Google Cloud
- Source: https://docs.oracle.com/en/solutions/deploy-oracle-database-at-google-cloud/index.html
- Date: 2025-10
- Type: reference-architecture
- Services: exacs, adb-d, google-cloud
- Tags: database, multicloud, autonomous
## Summary (catalog)
ExaCS and ADB-D on Database@Google Cloud. RAC for active-active HA, ASM for storage redundancy. Backups to OCI Object Storage via Autonomous Recovery Service.
## Architecture (fetched from source)
Architecture
This architecture shows a detailed topology for
Oracle AI Database@Google
Cloud :
Description of the illustration google-detailed-arch.png
google-detailed-arch-oracle.zip
The architecture displays application resources within a
VPC of a Google Cloud project, located in a single zone of a Google Cloud region. An application subnet in the VPC connects to Oracle AI Database@Google
Cloud using the ODB network in the OCI child site, located in the same Google Cloud region. The client subnet of the Oracle Autonomous AI Database Serverless , the Oracle Exadata Database Service on Dedicated
Infrastructure client subnet, and the backup subnets of Oracle Database Autonomous
Recovery Service are defined in the ODB network . The VCN extends into the OCI region to enable connections to other resources within
OCI. The OCI region hosts the following OCI services: OCI Vault , OCI Object Storage , and control plane.
This architecture supports the following components:
- Google Cloud region
A
Google Cloud region is a geographical area that contains
data centers and infrastructure for hosting resources.
Regions are made up of zones, which are isolated from each
other within the region.
- Google Virtual Private Cloud
Google
Virtual Private Cloud (VPC) provides networking
functionality to Compute Engine virtual machine (VM)
instances, Google Kubernetes Engine (GKE) containers,
database services, and serverless workloads. VPC provides
global, scalable, and flexible networking for your
cloud-based service.
- Google Cloud zone
A zone in
Google Cloud is a deployment area for resources within a
region. Zones are isolated from each other within a region,
and are treated as a single failure domain.
- Google Cloud project
A Google
Cloud Project is required to use Google Workspace APIs and
build Google Workspace add-ons or apps. A Cloud Project
forms the basis for creating, enabling, and using all Google
Cloud services, including managing APIs, enabling billing,
adding and removing collaborators, and managing
permissions.
- ODB network
The ODB network creates a metadata construct around the Google Virtual Private Cloud (VPC), serving as the foundation for all database provisioning. The ODB network enables support for Shared VPC by abstracting and centralizing network configuration - such as subnets, CIDR ranges, and routing. This allows network administrators to manage connectivity independently of database deployment workflows.
- OCI region
An OCI region
is a localized geographic area that contains one
or more data centers, hosting availability
domains. Regions are independent of other regions,
and vast distances can separate them (across
countries or even continents).
- OCI virtual cloud
network and subnet
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
inter-domain routing (CIDR) blocks that you can
change after you create the VCN. You can segment a
VCN into subnets, which can be scoped to a region
or to an availability domain. Each subnet consists
of a contiguous range of addresses that don't
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.
- Oracle Autonomous AI Database Serverless
Oracle Autonomous AI Database Serverless is an Oracle Autonomous AI Database . You have a fully elastic database where Oracle autonomously operates all aspects of the database lifecycle from database placement to backup and updates.
- Oracle Exadata Database Service on Dedicated
Infrastructure
Oracle Exadata Database Service on Dedicated
Infrastructure enables you to leverage the power of Exadata in the cloud. Oracle Exadata Database
Service delivers proven Oracle AI Database 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 Oracle AI Database workloads helps you simplify management and reduce costs.
- OCI Object Storage
OCI Object Storage provides access to large amounts of structured and unstructured data of any content type, including database backups, analytic data, and rich content such as images and videos. You can safely and securely store data directly from applications or from within the cloud platform. You can scale storage without experiencing any degradation in performance or service reliability.
- OCI Vault
Oracle Cloud Infrastructure Vault enables you to create and centrally manage the encryption keys that protect your data and the secret credentials that you use to secure access to your resources in the cloud. The default key management is Oracle-managed keys. You can also use customer-managed keys which use OCI Vault . OCI Vault offers a rich set of REST APIs to manage vaults and keys.
Recommendations
Use the following recommendations as a starting point when deploying
multicloud workloads. Your requirements might differ from the architecture described
here.
- High Availability
Oracle Autonomous AI Database and Oracle Exadata Database
Service provide high availability through several built-in features that ensure
minimal downtime and data protection. It leverages Oracle Real Application
Cluster (RAC) for active-active clustering, enabling database instances to run
on multiple nodes, ensuring continuous availability even if one node fails.
Additionally it offers Oracle Automatic Storage Management (ASM) with
redundancy, fault tolerance, and fast recovery options, making it a robust
platform for mission-critical workloads.
- Backup
Oracle Autonomous AI Database in Oracle AI Database@Google
Cloud is automatically backed up to OCI Object Storage in the OCI region. Both the backup and restore processes are initiated
through Oracle Autonomous AI Database . Autonomous AI Database also can have customer initiated backups through the Autonomous AI Database service. All recovery is done through Autonomous AI Database via console, command line, or API interfaces.
Oracle Exadata Database
Service has a choice of using Oracle Database Zero Data Loss Autonomous Recovery Service or OCI Object Storage for automatic database backups. Autonomous Recovery Service dramatically
shortens backup windows by configuring database-optimized automatic backups and
implements an incremental backup forever strategy. It reduces recovery time by
using virtual full backups to immediately restore instead of having to apply
multiple days of incremental backups in a traditional recovery.
- Security
Oracle Data Safe is an OCI cloud-native tool that enables you to achieve data privacy and data
compliance for your Oracle databases. Oracle Data Safe empowers organizations to understand data sensitivity, evaluate data risks,
mask sensitive data, implement and monitor security controls, assess user
security, monitor user activity, and manage Oracle Database 23ai SQL
Firewall—all in a single, unified console. These capabilities help to manage the
day-to-day security and compliance requirements of Oracle databases.
Considerations
When deploying this architecture, consider the following information.
- Tenancy
The tenancy must support OCI identity domains. You can
create an OCI tenancy when signing up.
- Network Connectivity
Plan your network connectivity in advance
to define your network address space (CIDR) and
topologies. Create the ODB network in the same Google Cloud project as the VPC to which you will connect.
The CIDR blocks for any Google Cloud VPCs and OCI
VCNs must not overlap.
- Configuration
Database subnet