For cases in which a
significant amount of data is input to the primary system using loads, such as in a
data warehouse, a viable disaster-recovery plan is simply to back up the load files to
a secondary site on which they will wait, ready for reloading to either the primary or
secondary site, should a disaster occur.
While these methods may seem relatively crude, they can provide simple data redundancy
for targeted sets of data. Transportable tablespaces can also be used to move
entire tablespaces to a backup platform. Transportable tablespaces in Oracle Database
10g and newer releases let youtransport tablespaces from one type of system to
another, increasing their flexibility for implementing redundancy, moving large
amounts of data, and migrating to another database platform.
Rolling Upgrades | 289
Rolling Upgrades
Thus far, we have focused on preventing unplanned downtime. But much of the
availability planning in the past included defining planned downtime for system
maintenance operations. Today, such downtime has largely disappeared with Oracle??™s
extensive online management capabilities.
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