Most database systems—including MySQL, Oracle, and SQL Server—require external data replication and switchover mechanisms when deployed in a high availability (HA) environment. AIX’s DB2 has its own built-in HA environment, called High Availability Disaster Recovery. HADR is quick to set up and fairly easy to configure. DB2 does offer other replication services, such as log shipping; however, HADR offers a pretty bulletproof approach when switching from the primary to ...

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