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Database

Tables

Main database tables description:

  • system_inventory — Partitioned table for the registered host / inventory profile: internal id, Insights inventory_id, rh_account_id, vmaas_json (packages, repos, modules for VMaaS), yum_updates and related checksums, staleness and culling timestamps, display_name, OS fields, tags, workspace fields, and workload flags. system_repo (and similar link tables) use this internal id as the system key. The listener upserts rows here and relies on system_inventory for upload locks and unchanged detection; the evaluator reads it via a join to system_patch.
  • system_patch — Partitioned evaluation output for each system, keyed by rh_account_id and system_id where system_id equals system_inventory.id on the same account. Holds advisory and package count caches, last_evaluation, third_party, template_id, and related aggregates. Rows are created or updated by the listener together with system_inventory; the evaluator persists evaluation results here (not into a single legacy table).
  • advisory_metadata - stores info about advisories (description, summary, solution etc.). It's synced and stored on trigger by vmaas_sync component. It allows to display detail information about the advisory.
  • system_advisories - stores info about advisories evaluated for particular systems (system - advisory M-N mapping table). system_id references system_inventory.id. Contains info when system advisory was firstly reported and patched (if so). Records are created and updated by evaluator component. It allows to display list of advisories related to a system.
  • advisory_account_data - stores info about all advisories detected within at least one system that belongs to a given account. So it provides overall statistics about system advisories displayed by the application.
  • account_advisory - workspace-scoped version of advisory_account_data. Stores per-advisory aggregate counts (systems_applicable, systems_installable) and notification state for each workspace within an account. Keyed by (rh_account_id, workspace_id, advisory_id), partitioned by rh_account_id (32 partitions).
  • package_name - names of the packages installed on systems
  • package - list of all packages versions, precisely all EVRAs (epoch-version-release-arch)
  • system_package2 - list of packages installed on a system
  • template - Content Sources template metadata per account (rh_account_id, id, uuid, name, environment_id, arch, version, etc.). Upserted by listener from platform.content-sources.template events.
  • template_advisory - junction table linking a template to advisory_metadata rows (rh_account_id, template_id, advisory_id). Populated by listener on template-updated from Content Sources. Read by evaluator (when template_advisory_eval=true) to determine which advisories are installable for systems assigned via system_patch.template_id. The same flag on listener triggers re-evaluation when rows change.

Schema

The ERD image below may lag database_admin/schema/create_schema.sql; for systems it may not reflect the split between system_inventory (host profile / upload payload) and system_patch (evaluation caches and aggregates).

Migrations

Schema changes live in database_admin/migrations/ and are applied by database-admin (database_admin/update.go).

In production:

  • A single db-migration ClowdApp Job runs migrate once per deploy (completions: 1, parallelism: 1).
  • Manager, listener, evaluator, and other components use a check-for-db init container that polls until the schema matches (database_admin/check-upgraded.sh).

Before DDL, database-admin blocks app database users from new logins and waits for existing sessions to drain:

  1. ALTER USER … NOLOGIN for listener, evaluator, manager, vmaas_sync
  2. Optionally pg_terminate_backend on remaining app sessions when terminate_db_sessions=true
  3. Poll pg_stat_activity until no app-user sessions remain
  4. Run MigrateUp
  5. ALTER USER … LOGIN to restore access

NOLOGIN stops new connections but does not close existing ones. Lingering sessions can hold locks and block DDL on large or sensitive migrations.

Topic Document
Major DDL deploy procedure, troubleshooting, SQL diagnostics major-migration-runbook.md
DATABASE_ADMIN_CONFIG flags (including terminate_db_sessions) and log sequence major-migration-runbook.md
ClowdApp parameters deploy/clowdapp.yaml, database_admin/config.go