You even have the option to
create an AFTER SUSPEND trigger to fire when an operation has been
suspended.
With Automatic Storage Management (ASM), introduced in Oracle Database
10g, you can add additional disk space or take away disks without interrupting
database service. Although you should still carefully estimate storage requirements,
the penalty for an incorrect judgment, in terms of database downtime, is
significantly reduced with ASM.
What are the availability requirements?
What elements of redundancy, such as additional disk drives, do you need to
provide the required availability? ASM also provides automatic mirroring for
data, which can help to provide data resiliency.
What are my performance requirements?
What response times do your users expect, and how much of that time can you give
them? Will you measure performance in terms of average response time, maximum
response time, response time at peak load, total throughput, or average load?
What are my security requirements?
Will the application, the operating system, or the Oracle database (or some combination
of these) enforce security?
The Value of Estimating
Even if you are unsure of things such as sizing and usage details, take your best guess
as to initial values and growth rates and document these estimates.
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