There is still only one database and one set of tablespaces to manage; it??™s just
that there is more than one instance accessing the tablespaces.
Automatic Segment Space Management (ASSM), introduced in Oracle9i, enhances the
usability of tablespaces in a RAC environment. Because you no longer have to worry about more
freelists and freelist groups to support multiple instances, and therefore more concurrent writers to
a table, adding more instances to the cluster does not necessarily require table reorganizations.
CHAPTER
11
Backup and Recovery
Options
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392 Oracle Database 11g DBA Handbook
racle provides a variety of backup procedures and options that help protect an
Oracle database. If they are properly implemented, these options will allow you
to effectively back up your databases and recover them easily and efficiently.
Oracle??™s backup capabilities include logical and physical backups, both of
which have a number of options available. This chapter will not detail every
possible option and recovery scenario; rather, I will focus on using the best options in the most
effective manner possible. You will see how to best integrate the available backup procedures
with each other and with the operating system backups. You will also see details on the options
for Data Pump Export and Import, which were introduced in Oracle Database 10g.
Capabilities
There are three standard methods of backing up an Oracle database: exports, offline backups, and
online backups.
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