Hot standby mode with DB2 HADR

DB2® HADR is a database replication feature that provides a high availability solution for partial or complete site system failures.

In hot standby mode, primary database servers and standby database servers support failover. The standby database is kept in sync with the primary database by accessing the log data that is generated on the primary database. The standby database constantly synchronizes data by rolling forward through the logs.

When a critical resource on the primary database server fails, a failure detection mechanism is triggered and failover occurs. During failover, the data source is moved from the primary server to the standby server and clients can access data through the standby server. Clients access the database by using a virtual address or a service IP address that is reserved for DB2.

The DB2 HA Feature for LUW supports automation of DB2 HADR.

The following diagram shows a primary database server that is supported by a standby database server. The standby server has access to the same synchronized data.

The diagram is described in the main body of text.


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