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High Availability (HA) provides a failover solution in the event a server, or database failure. Disaster Recovery (DR) provides a recovery solution in the event of a disaster that causes an entire data center to fail. Developing a HA/DR strategy can be challenging. Microsoft offers several possible HA/DR options, but which you choose will depend on your company and business requirements. We at Scalability Engineers are well equipped with each and HA/DR option.
A partial site failure can be caused by hardware, network, or software failure. Without HA/DR, a partial site failure requires restarting the database management system (DBMS) server that contains the database. The length of time that it takes to restart the database and the server where it is located is unpredictable. It can take several minutes before the database is brought back to a consistent state and made available. With HADR, a standby database can take over in seconds. HA/DR might be your best option if most or all data in your database requires protection or if you perform DDL operations that must be automatically replicated on a standby database.