Rolling upgrades
A rolling upgrade allows you to bring down some of the nodes in the grid,
upgrade their software, and then bring them back online as part of the grid. You
can then repeat this procedure with the other nodes. The end result is that you
can achieve a complete upgrade of your Oracle database software without having
to bring down the database.
Automatic Storage Management
The ASM system also enables management of large numbers of nodes by implementing
automatic data rebalancing across disks, as well as easy addition of new
disks to the overall pool of storage.
Enterprise Manager Grid Control
Enterprise Manager Grid Control manages a grid infrastructure from a central
location, including RAC databases, storage, Oracle Application Servers/Fusion
Middleware, and network services.
Oracle Database 11g includes multitier service management and improvements to
ASM including support for rolling upgrades, automatic bad block detection and
repair, and fast mirror resynchronization. The Automatic Database Diagnostics
Monitor (ADDM) for RAC determines the most globally significant performance
issues for a multi-instance database, including the global cache interconnect, lock
manager congestion, global resource contention (such as I/O), high-load SQL across
the instances, and skew in instance response times.
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