| IBM DB2 is a relational model database server or | | | | A complete DB2 site failure may take place when |
| relational database management system, developed | | | | any natural disaster, like fire or flood, causes the |
| and marketed by IBM. It provides greater data | | | | whole site to be destroyed. Since the HADR deploys |
| availability and stability, as compared to other | | | | TCP/IP to communicate between standby and |
| database management systems. You can prevent | | | | primary databases, DB2 database may be situated at |
| DB2 database corruption and need of DB2 Database | | | | different locations. When any disaster takes place at |
| Recovery using DB2 HADR (High Availability Disaster | | | | primary site, the database availability is maintained |
| Recovery) feature. DB2 HADR is a data replication | | | | through standby database. After the standby |
| characteristics, which offers high availability for both | | | | database takeovers primary database, the original |
| complete and partial site failures. This features | | | | database can be brought back to working state and |
| protects against the data loss by duplicating data | | | | return the database to primary database's status. It |
| changes from source database, known as primary, to | | | | is called failback. |
| target database. | | | | |