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Database Messages

docs/agent_guides/streaming-system/message/message-semantic-database.md

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Database Messages

Messages managing database lifecycle. All are CChannel-only broadcasts serialized via ExclusiveDBName.

All broadcast messages implicitly carry SharedCluster via the Broadcaster.

MessageDispatchExclusiveRequiredResourceKey
CreateDatabaseBroadcast: CChannelNoExclusiveDBName
AlterDatabaseBroadcast: CChannelNoExclusiveDBName
DropDatabaseBroadcast: CChannelNoExclusiveDBName
  • CreateDatabase: Creates a new database.
  • AlterDatabase: Alters database properties (may trigger load config updates for all collections in the DB).
  • DropDatabase: Drops a database. The database must be empty (no collections).

Key Invariants

  • CreateDatabase must precede CreateCollection in this database.
  • DropDatabase must come after all collections in the database are dropped.
  • ExclusiveDBName conflicts with SharedDBName (used by collection DDL), preventing concurrent collection operations during database DDL.
CreateDatabase@tt=1 → CreateCollection(in_db)@tt=5 → ... → DropCollection@tt=15 → DropDatabase@tt=20