ORACLE RAC R2

Oracle Real Application Clusters (RAC) provides a database environment that is highly available as well as scalable. ... Oracle 12c brings additional enhancements to the RAC environment, and even more ways to provide application continuity. InOracle 11g, Oracle introduced rolling patches for the RAC environment.

Oracle RAC allows multiple computers to run Oracle RDBMS software simultaneously while accessing a single database, thus providing clustering. In a non-RAC Oracle database, a single instance accesses a single database. Thedatabase consists of a collection of data files, control files, and redo logs located on disk.

Oracle RMAN (Oracle Recovery Manager) is a utility built into Oracle databases to automate backup and recovery; it includes features not available in third-partybackup tools. RMAN was introduced in Oracle release 8.0. ... Block-level corruption detection is provided during backup and restore.