Azure hub — databases gap fill (2026-10-21)

What the databases gap fill adds after family 6 — SQL Managed Instance, Hyperscale with elastic pools and failover groups, Cosmos DB's MongoDB, Table, Cassandra and Gremlin APIs with Azure DocumentDB and Entra sign-in from TypeScript, PostgreSQL replicas, upgrades and elastic clusters, a list of retired and retiring database services, MySQL Bicep, and the PostgreSQL and MySQL private endpoint group IDs.

markdownreferencev1RFZP-3JBEarea: changelogchangelogrelease notesdatabases gap fill

Created 21 Oct 2026 · Modified 23 Oct 2026 · 1 version

What's in it

6 new documents including this note, bringing the hub to 101, and 6 extended:

  • reference/sql/managed-instance.md: the delegated subnet and its address arithmetic, VNet-local, public (3342) and private endpoints, Entra logins in master, instance failover groups.
  • reference/sql/scale-and-continuity.md: Hyperscale (128 TB, 30 named replicas, 45-day way back), elastic pools, failover groups and geo-replication.
  • reference/cosmos-db/other-apis-and-documentdb.md: Azure DocumentDB with Entra users and MONGODB-OIDC in TypeScript, Cosmos DB for MongoDB (RU) error codes, Table data-plane roles, Cassandra and Gremlin guidance.
  • reference/postgresql/replicas-upgrades-and-clusters.md: read replicas and virtual endpoints, in-place upgrades and the extensions that block them, elastic clusters.
  • reference/databases/retired-and-replacements.md: what's gone (single servers, MariaDB, SQL Edge) and going (Cosmos DB for PostgreSQL, Azure Cache for Redis, old PostgreSQL and MySQL versions).
  • Extended: reference/mysql/flexible-server.md (Bicep with a user-assigned identity, Entra admin and aad_auth_only), reference/postgresql/flexible-server.md and the MySQL document (groupIds postgresqlServer and mysqlServer, from the REST spec examples), and links from the SQL, Cosmos DB and PostgreSQL references.

2026 changes captured

  • Azure Cosmos DB for PostgreSQL is on a retirement path with new deployments blocked; elastic clusters on PostgreSQL flexible server replace it.
  • Azure DocumentDB is the new name for Cosmos DB for MongoDB vCore; it uses the ossrdbms-aad token audience.
  • Microsoft now points Cassandra migrations to Managed Instance for Apache Cassandra and Gremlin to Graph in Microsoft Fabric.

How it was checked

Learn pages via WebFetch (each with its update date); REST spec examples at azure-rest-api-specs@c783b658; the MySQL Bicep builds and lints clean with Bicep 0.48.1; the DocumentDB example (mongodb 7.7.0) compiles under tsc --strict; CLI flags checked against 2.91.0 help (az postgres flexible-server upgrade --validate-only exists there).

Contradiction found

Microsoft's 2025 lifecycle list puts MySQL 5.7's end of support on September 30, 2025; the MySQL version policy says standard support ended September 30, 2026, with extended support from October 1, 2026. The hub follows the version policy.

Still missing

SQL Server on Azure VMs, Azure Managed Instance for Apache Cassandra itself, Cosmos DB for Apache Cassandra and Gremlin sign-in details, and the Entra limitations page for DocumentDB (it couldn't be fetched).

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