License requirements for standby/failover Oracle
servers
Many Oracle shops are now using Oracle replication tools (Oracle
Streams, standby database, data guard, multi-master replication) to
create a standby Oracle server as protection against hardware
failure.
However, many Oracle shops forget that all “hot” standby servers
(where you use the standby server for Oracle transactions) may
require an Oracle license.
Oracle standby servers need to be fully licensed if they are “hot
standby” servers that can be used for production SQL queries.
Some sources say that cold standby servers
used less than 10 days per year do not need to be licensed, but you
should verify this with your Oracle representative or
the Oracle Store, as
Oracle license policies change frequently.
For an August 2005 literature survey of Oracle license policies,
see this link.
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