Hot database patching can now
be applied to any Oracle database, including RAC implementations.
Disk and Storage Technology
The discussion of hardware architectures and performance in this chapter so far has
centered on ways of increasing performance by increasing available system resources
such as CPUs, memory, and I/O subsystems and on the parallelism that can take
Disk and Storage Technology | 301
advantage of these resources. An important way to increase hardware performance is
to tune for I/O, which includes spreading data across disks and providing an adequate
number of access paths to the data. As a rule of thumb, your I/O should
deliver 1 GB per second of throughput for every 4 CPUs with a minimum of 2 GB per
second delivered. Since disk access has the greatest latency, another focus of I/O tuning
is keeping data retrieved from disk in memory.
Oracle refers to proper configurations??”those that feature proper I/O (especially
spindles that provide access paths to storage), memory, and CPUs??”as balanced configurations.
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