PDB-Level Data Guard With Federated Redo Synchronization

The patent segments the HA configuration from the CDB level to the PDB level. Each PDB can have its own standby PDB configured independently, allowing different synchronization topologies for different PDBs within the same CDB. This enables flexible one-to-one, one-to-many, or many-to-one relationships between primary and standby PDBs, resolving the rigidity of traditional CDB-level HA solutions.

The patent segments the redo feed resource at the PDB level, allowing each standby PDB to have its own dedicated redo feed from its primary PDB. This eliminates the performance bottleneck caused by multiple PDBs competing for a single shared redo feed, while still maintaining resource efficiency through the multitenant architecture. Each PDB-standby PDB pair operates independently with predictable replication lag.

The patent segments the HA roles at the PDB level, allowing a single CDB to host multiple primary PDBs and multiple standby PDBs with different HA roles. A standby PDB can be configured to receive redo from a primary PDB in a different CDB, enabling cross-CDB redundancy and protecting against cascading failures. This maintains role-based HA stability while dramatically improving failure resilience and scalability.

The patent segments the HA configuration capability to the individual PDB level, allowing administrators to configure standby PDBs independently for each primary PDB. This enables fine-grained control over which PDBs require HA, the choice of standby targets, and the synchronization parameters. The system maintains system-wide redundancy through coordinated PDB-level configurations while providing unprecedented operational flexibility and elasticity.