Oracle rolling upgrades
Oracle Database Tips by Donald Burleson
A "rolling upgrade" is a zero-downtime method for
upgrading the Oracle software.
Burleson Consulting offer a
minimum-downtime and rolling upgrade service. Just
call now to schedule your rolling upgrade.
If you can spare five minutes, there is an
alternative to the RAC rolling upgrades. Oracle Real
Application clusters supports rolling upgrades, but it's complex.
low downtime Oracle upgrade secrets.
As you can imagine, the term rolling upgrade
means performing an upgrade to different databases one at a time
without stopping the database. Not just for single instance
environments, the rolling upgrade can also be performed on a Real
Application Clusters (RAC) environment where different instances of
the same database can be upgraded one at a time without shutting
This is exciting for RAC shops because that
generally means that some of the instances will remain available
during any outage scheduled for patch upgrades. The instances
are brought down one-by-one, leaving the rest online to do the work.
The Oracle opatch utility allows a patch to be applied successively to
each different instance on the cluster.
This can keep scheduled outage time minimal;
however, not all patches are eligible for rolling upgrades.
Oracle must certify the patch for a rolling upgrade and rolling patch
upgrades for cases where the Oracle home is on a Cluster File System
(CFS). They are also not available for cases where the Oracle
home is on shared volumes provided by file servers or NFS-mounted
drives. In all cases of approved rolling upgrade patches, each
node must have its own copy of the Oracle Database software.
Situations where rolling upgrades can be
certified include the following situations where patches:
do not affect database contents, including
the data dictionary
are not related to RAC inter-node
are related to client-side tools. Such
tools might include SQL*Plus, Oracle utilities and SQL*Net
do not change shared database resources.
Such resources might include control files, common header
definitions of kernel modules and/or datafile headers.
are one-off patches. Rolling upgrades
are currently not approved for patch sets.
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