Architecture

Oracle Multitenant was introduced in 12c and is now the default deployment model. Despite broad adoption, the internal mechanics of how CDBs and PDBs share and isolate resources are frequently misunderstood. This article is for architects designing multitenant deployments who need to reason about performance isolation, resource governance, and operational boundaries. CDB vs Non-CDB: The Core Difference In a non-CDB, the database owns the entire Oracle instance. In a CDB: ...

The Exadata X11M platform separates database compute and storage cells connected via an RDMA-capable RoCE fabric. This page summarizes hardware variants and provides practical command-line examples for common administration, troubleshooting and monitoring tasks. Architecture Overview Database Servers (Compute) These servers run the database and client-facing workloads. Standard Exadata X11M Database Server CPU: 2x 96-core AMD EPYC 9J25 (192 physical cores) Memory: 6400 MT/s DDR5, 512 GB–3 TB Local storage: 2x 3.84 TB NVMe (OS / Oracle binaries) Exadata X11M-Z Database Server (Entry) ...