How backup and recovery works in SAP HANA Database

Backup which requires to restore the SAP HANA database in case of recovery.

SAP HANA DATA BACKUP:

To take the data backup,the HANA database system must be in online state a backup request is received by one of the index server and forward to the backup manager in the name server .The backup manager tell all participating servers to perform a global save point.the global save point is required to get a system wide consistent snapshot  of the database.

Backup controller have to get the data  from the page stored in the data volumes on the disk .this is necessary because we need to backup up the consistent state written during the global save point  operation.

SAP HANA Log backup:

Its support automatic log backup,Automatic log backup is a local process which triggered and executed by each server in the SAP HANA database server  autonomously.It perform when log segment is full ,when time limit is exceeded after startup of a server.the time limit is required  to ensure that logs are backed up from time to time even if if there are few changes and the log segment are not filled.

SAP HANA is a distributed  system.It consist of multiple servers their.own persistence name server,multiple index server,and a statistics server.It is impotent that during recovery the system is restored to a state that is consistence across the whole system.