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AdministeringIn addition to administering the database server, you can tune performance, replicate data, and archive data.
Backup and Restore GuideThe HCL OneDB™ Backup and Restore Guide describes how to use the HCL® OneDB® ON-Bar and ontape utilities to back up and restore database server data. These utilities enable you to recover your databases after data is lost or becomes corrupted due to hardware or software failure or accident.
ON-Bar backup and restore system
External backup and restore
External backup and restore overviewAn external backup and restore eliminates the downtime of systems because the backup and restore operations are performed external to the HCL® OneDB® system.
Prepare for an external backup
Block and unblock database server

Block and unblock database server

This topic shows the syntax of the block and unblock commands on HCL OneDB™.


Element	Purpose	Key considerations
onmode -c	Performs a checkpoint and blocks or unblocks the database server	None.
block	Blocks the database server from any transactions	Sets up the database server for an external backup. While the database server is blocked, users can access it in read-only mode. Sample command: onmode -c block
unblock	Unblocks the database server, allowing data transactions and normal database server operations to resume	Do not unblock until the external backup is finished. Sample command: onmode -c unblock