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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 Key Vault for Oracle Database@Azure
- Source: https://docs.oracle.com/en/solutions/deploy-key-vault-database-at-azure/index.html
- Date: 2024-10
- Type: reference-architecture
- Services: vault, exacs, azure
- Tags: security, database, multicloud, azure
## Summary (catalog)
Key Vault for TDE key management on Database@Azure. Centralized encryption key lifecycle with multi-master replication for HA. Supports PKCS#11, REST API, and Oracle-native key management.
## Architecture (fetched from source)
Architecture
This architecture shows how to deploy Oracle Key Vault on an Microsoft Azure virtual machine (VM) as a secure long-term external key management storage for
Oracle Exadata Database
Service encryption keys in Oracle Database@Azure .
The architecture diagram depicts the recommended Oracle Key Vault multi-master cluster in Azure to provide continuously available, extremely scalable, and fault-tolerant
key management for the Oracle Database in Oracle Exadata Database
Service ( Oracle Database@Azure ).
The following diagram illustrates this reference architecture.
Description of the illustration key-vault-database-azure-diagram.png
key-vault-database-azure-diagram-oracle.zip
Oracle Key Vault for Oracle Database@Azure can be deployed on-premises, in Azure , or any other cloud, as long as network connectivity can be established.
Stretched Oracle Key Vault clusters (on-premises to cloud, or across cloud providers) are also
possible, giving you maximum deployment flexibility and local availability
of your encryption keys. Oracle Key Vault provides "hold your own key" functionality out of the box, without the
need for an additional, expensive third-party key management appliance.
The architecture has the following components:
- Azure region
An Oracle Cloud
Infrastructure region is a localized geographic area that contains one
or more data centers, called availability domains. Regions
are independent of other regions, and vast distances can
separate them (across countries or even continents).
An Azure region is a geographical area in which one or more
physical Azure data centers, called availability zones, reside. Regions
are independent of other regions, and vast distances can
separate them (across countries or even continents).
Azure and OCI regions are localized geographic areas. For Oracle Database@Azure , an Azure region is connected to an OCI region, with availability
zones (AZs) in Azure connected to availability domains (ADs) in OCI. Azure and OCI region pairs are selected to minimize distance
and latency.
- Azure availability zone
An availability zone
is a physically separate data center within a region that is
designed to be available and fault tolerant. Availability
zones are close enough to have low-latency connections to
other availability zones.
- Microsoft Azure Virtual Network
Microsoft Azure Virtual Network (VNet) is the fundamental building block for your private
network in Azure . VNet enables many types of Azure resources, such as Azure virtual machines (VM), to securely communicate with each other, the internet,
and on-premises networks.
- Exadata Database Service on Dedicated Infrastructure
Oracle Exadata Database
Service delivers proven Oracle 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 OLTP, in-memory
analytics, and converged Oracle Database workloads help simplify management and
reduce costs.
Exadata Cloud Infrastructure X9M brings more CPU cores,
increased storage, and a faster network fabric to the public cloud. Exadata X9M
storage servers include Exadata RDMA Memory (XRMEM), creating an additional tier
of storage, boosting overall system performance. Exadata X9M combines XRMEM with
innovative RDMA algorithms that bypass the network and I/O stack, eliminating
expensive CPU interrupts and context switches.
Exadata Cloud
Infrastructure X9M increases the throughput of its 100 Gbps active-active Remote
Direct Memory Access over Converged Ethernet (RoCE) internal network fabric,
providing a faster interconnect than previous generations with extremely
low-latency between all compute and storage servers.
- Oracle Database@Azure
Oracle Database@Azure is the Oracle Database service ( Oracle Exadata Database Service on Dedicated
Infrastructure or Oracle Autonomous Database Serverless ) running on Oracle Cloud
Infrastructure (OCI), deployed in Microsoft Azure data centers. The service offers features and price
parity with OCI. Users purchase the service on Azure Marketplace.
Oracle Database@Azure integrates Oracle Exadata Database
Service , Oracle Real Application Clusters (Oracle
RAC) , and Oracle Data Guard technologies into the Azure platform. Oracle Database@Azure service offers the same low latency as other Azure -native services and meets mission-critical workloads and
cloud-native development needs. Users manage the service on
the Azure console and with Azure automation tools. The service is deployed in Azure Virtual Network (VNet) and integrated with the Azure identity and access management system. The OCI and Oracle
Database metrics and audit logs are natively available in
Azure . The service requires that users have an Azure tenancy and an OCI tenancy.
- Transparent Data Encryption (TDE)
Transparent Data Encryption (TDE) transparently encrypts data at rest in an Oracle Database . It stops unauthorized attempts from the
operating system to access database data stored in
files, without impacting how applications access
the data using SQL. TDE is fully integrated with
Oracle Database and can encrypt entire database backups (RMAN),
Data Pump exports, entire application tablespaces,
or specific sensitive columns. Encrypted data
remains encrypted in the database, whether it is
in tablespace storage files, temporary
tablespaces, undo tablespaces, or other files such
as redo logs.
- Key Vault
Oracle Key Vault securely stores encryption keys, Oracle Wallets, Java
KeyStores, SSH key pairs, and other secrets in a scalable,
fault-tolerant cluster that supports the OASIS KMIP standard
and deploys in Oracle Cloud
Infrastructure , Microsoft Azure , and Amazon Web Services as well as on-premises on dedicated hardware or virtual
machines.
Recommendations
Use the following recommendations as a starting point.
Your requirements might differ from the architecture described here.
- Oracle Key Vault ISO
To build the right Oracle Key Vault solution, make sure to use the latest Oracle Key Vault installation medium. See Explore More for the Oracle Software
Delivery Cloud link.
- Oracle Key Vault image building
To build the Oracle Key Vault image from the ISO, do so on a local system with at least 1 TB of storage
with at least 32 GB in RAM. Create the virtual hard disk as
Fixed size and in the VHD
format.
- Multi-node cluster
Deploy Oracle Key Vault as a multi-node cluster to achieve maximum availability and reliability with
read-write pairs of Oracle Key Vault nodes.
Oracle Key Vault multi-master cluster is created with a first node, then additional nodes can
e subsequently inducted to eventually form a multi-node cluster with up to 8
read-write pairs.
The initial node is in read-only restricted
mode and no critical data can be added to it. Oracle recommends to deploy a
second node to form a read-write pair with the first node. After which, the
cluster can be expanded with read-write pairs so that both critical and
non-critical data can be added to the read-write nodes. Read-only nodes can help
with load balancing or operation continuity during maintenance operations.
Consult the documentation to learn how a multi-master cluster
affects endpoints, both in the way an endpoint connects and with
restrictions.
For large deployments, install at least four Oracle Key Vault servers. Endpoints should be enrolled by making them unique and balanced
across the four servers to ensure high availability. For example, if a data
center has 1,000 database endpoints to register, and you have four Oracle Key Vault servers to accommodate them, then enroll 250 endpoints across each of the
four servers.
Ensure that the system clocks of the endpoint
host and the Orac