For example, Oracle provides online
reorganization capabilities in recent releases, a task that often required extensive
planning in the past.
The one remaining area that posed an availability challenge until recently is the need
to perform upgrades. Today, where RAC configurations leverage ASM, rolling
upgrades (introduced in Oracle Database 10g Release 2) are entirely feasible with no
downtime. Among the tasks that can be accomplished are system and hardware
upgrades, operating system upgrades, patching, and storage migration.
Other Oracle features can minimize downtime for non-RAC or ASM configurations.
Data Guard can be used to minimize downtime for system, database, and patch set
upgrades. Transportable tablespaces and Oracle Streams are useful in speeding database
upgrades and platform migrations.
Export/Import, Standby Database, or Replication?
All the choices we??™ve discussed in this chapter offer you some type of protection
against losing critical data??”or your entire database. But which one is right for your
needs?
To quote the standard answer to so many technical questions, ???it depends.
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