Oracle Database 12c Release 2 Real Application Clusters Handbook- Concepts- Administration- Tuning And Troubleshooting -oracle Press- Jun 2026

Managing Oracle RAC in a 12c Release 2 environment requires more than just knowing a few srvctl commands. You need a solid grasp of the internals—from cache fusion to clusterware diagnostics.

Sequence usage in RAC is notoriously slow if not coded correctly. The handbook explains the difference between CACHE and NOORDER . It provides a definitive setup for sequence generation: CACHE 1000 + NOORDER for performance, versus ORDER for data warehouse loaders. It also introduces the 12.2 SEQUENCE_GLOBAL_CACHE parameter. Managing Oracle RAC in a 12c Release 2

Oracle RAC allows multiple instances of a database to run on different servers while sharing a single set of data files, effectively presenting a single database image to applications. Key architectural pillars include: The handbook explains the difference between CACHE and

This handbook is not for the absolute beginner. It assumes: Oracle RAC allows multiple instances of a database

For the uninitiated, 12cR2 introduced streamlined clusterware management, improved multitenant support for pluggable databases (PDBs) within RAC, and enhanced policy-based management. This handbook is the primary vehicle for understanding these evolutions.

The section of the handbook is critical because it dissects the "brain" of the cluster: the Oracle Clusterware and the Grid Infrastructure. Unlike a standard admin guide, the handbook visualizes the "heartbeat" of the cluster. It explains complex interconnects and how Cache Fusion—the technology that allows nodes to share data buffers in memory without writing to disk—actually functions.