How many DB systems must you provision before you can enable Oracle Data Guard for a virtual machine DB system database?
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It depends on how many standby databases you want for your primary database in the Oracle Data Guard configuration in Oracle Cloud Infrastructure.
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Three, first for the primary database, second for the standby database, and a third for the staging database in the Oracle Data Guard configuration.
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Two for both the primary and standby database, because a DB system with the database that you want to use as the standby must already exist before you enable Oracle Data Guard.
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One with the primary database, because a new DB system with the standby database is created and associated with the primary database when you enable Oracle Data Guard.