This topic describes the basic concepts and limitations of secondary backup.
A secondary backup is a backup of backup data and log backups. OceanBase Database allows you to perform secondary backup operations for clusters and tenants.
Basic concepts
Before you perform a secondary backup, you need to understand the following basic concepts:
Source backup location: the backup destination specified by the
backup_destparameter.Destination backup location: the backup destination specified by the
backup_backup_destparameter.Secondary backup: backs up backup files to another path.
Secondary log backup: backs up existing log backup files to another path.
Secondary data backup: backs up existing data backup files to another path.
Log splitting: splits backup logs into pieces and stores them in different directories.
Backup interruption: a situation in which the secondary backup of logs in a backup round is not possible because the log backups in the source backup location are cleared.
Round: a complete round of backup data streams. If you want to spit logs into pieces, a backup round includes multiple pieces. Otherwise, a backup round includes only one piece. OceanBase Database allows you to split logs into pieces for clusters and tenants.
Limitations
When you perform a secondary backup, ensure that at least one valid backup copy exists in the source backup location.